[876] | 1 | from asap._asap import Scantable |
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[226] | 2 | from asap import rcParams |
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[1118] | 3 | from asap import print_log |
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| 4 | from asap import asaplog |
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[946] | 5 | from asap import selector |
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[1153] | 6 | from asap import linecatalog |
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[1295] | 7 | from asap import _n_bools, mask_not, mask_and, mask_or |
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[102] | 8 | |
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[876] | 9 | class scantable(Scantable): |
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[102] | 10 | """ |
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| 11 | The ASAP container for scans |
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| 12 | """ |
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[710] | 13 | |
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[484] | 14 | def __init__(self, filename, average=None, unit=None): |
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[102] | 15 | """ |
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| 16 | Create a scantable from a saved one or make a reference |
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| 17 | Parameters: |
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[181] | 18 | filename: the name of an asap table on disk |
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| 19 | or |
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| 20 | the name of a rpfits/sdfits/ms file |
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| 21 | (integrations within scans are auto averaged |
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| 22 | and the whole file is read) |
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| 23 | or |
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| 24 | [advanced] a reference to an existing |
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[102] | 25 | scantable |
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[484] | 26 | average: average all integrations withinb a scan on read. |
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| 27 | The default (True) is taken from .asaprc. |
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| 28 | unit: brightness unit; must be consistent with K or Jy. |
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[340] | 29 | Over-rides the default selected by the reader |
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| 30 | (input rpfits/sdfits/ms) or replaces the value |
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| 31 | in existing scantables |
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[710] | 32 | """ |
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[976] | 33 | if average is None: |
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[710] | 34 | average = rcParams['scantable.autoaverage'] |
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[1259] | 35 | varlist = vars() |
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[876] | 36 | from asap._asap import stmath |
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| 37 | self._math = stmath() |
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| 38 | if isinstance(filename, Scantable): |
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| 39 | Scantable.__init__(self, filename) |
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[181] | 40 | else: |
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[1118] | 41 | if isinstance(filename, str): |
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[976] | 42 | import os.path |
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| 43 | filename = os.path.expandvars(filename) |
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| 44 | filename = os.path.expanduser(filename) |
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| 45 | if not os.path.exists(filename): |
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| 46 | s = "File '%s' not found." % (filename) |
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[718] | 47 | if rcParams['verbose']: |
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[976] | 48 | asaplog.push(s) |
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| 49 | print asaplog.pop().strip() |
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[718] | 50 | return |
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[976] | 51 | raise IOError(s) |
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[1115] | 52 | if os.path.isdir(filename) \ |
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[1118] | 53 | and not os.path.exists(filename+'/table.f1'): |
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[976] | 54 | # crude check if asap table |
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| 55 | if os.path.exists(filename+'/table.info'): |
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[1118] | 56 | ondisk = rcParams['scantable.storage'] == 'disk' |
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| 57 | Scantable.__init__(self, filename, ondisk) |
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[976] | 58 | if unit is not None: |
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| 59 | self.set_fluxunit(unit) |
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| 60 | self.set_freqframe(rcParams['scantable.freqframe']) |
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[718] | 61 | else: |
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[1118] | 62 | msg = "The given file '%s'is not a valid " \ |
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| 63 | "asap table." % (filename) |
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[976] | 64 | if rcParams['verbose']: |
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| 65 | print msg |
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| 66 | return |
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| 67 | else: |
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| 68 | raise IOError(msg) |
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[226] | 69 | else: |
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[1118] | 70 | self._fill([filename], unit, average) |
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| 71 | elif (isinstance(filename, list) or isinstance(filename, tuple)) \ |
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[976] | 72 | and isinstance(filename[-1], str): |
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| 73 | self._fill(filename, unit, average) |
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[1259] | 74 | self._add_history("scantable", varlist) |
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[714] | 75 | print_log() |
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[102] | 76 | |
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[876] | 77 | def save(self, name=None, format=None, overwrite=False): |
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[116] | 78 | """ |
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[1280] | 79 | Store the scantable on disk. This can be an asap (aips++) Table, |
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| 80 | SDFITS or MS2 format. |
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[116] | 81 | Parameters: |
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[1093] | 82 | name: the name of the outputfile. For format "ASCII" |
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| 83 | this is the root file name (data in 'name'.txt |
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[497] | 84 | and header in 'name'_header.txt) |
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[116] | 85 | format: an optional file format. Default is ASAP. |
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[280] | 86 | Allowed are - 'ASAP' (save as ASAP [aips++] Table), |
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[194] | 87 | 'SDFITS' (save as SDFITS file) |
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[200] | 88 | 'ASCII' (saves as ascii text file) |
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[226] | 89 | 'MS2' (saves as an aips++ |
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| 90 | MeasurementSet V2) |
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[411] | 91 | overwrite: If the file should be overwritten if it exists. |
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[256] | 92 | The default False is to return with warning |
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[411] | 93 | without writing the output. USE WITH CARE. |
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[116] | 94 | Example: |
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| 95 | scan.save('myscan.asap') |
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[1118] | 96 | scan.save('myscan.sdfits', 'SDFITS') |
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[116] | 97 | """ |
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[411] | 98 | from os import path |
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[226] | 99 | if format is None: format = rcParams['scantable.save'] |
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[256] | 100 | suffix = '.'+format.lower() |
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[1118] | 101 | if name is None or name == "": |
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[256] | 102 | name = 'scantable'+suffix |
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[718] | 103 | msg = "No filename given. Using default name %s..." % name |
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| 104 | asaplog.push(msg) |
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[411] | 105 | name = path.expandvars(name) |
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[256] | 106 | if path.isfile(name) or path.isdir(name): |
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| 107 | if not overwrite: |
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[718] | 108 | msg = "File %s exists." % name |
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| 109 | if rcParams['verbose']: |
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| 110 | print msg |
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| 111 | return |
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| 112 | else: |
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| 113 | raise IOError(msg) |
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[451] | 114 | format2 = format.upper() |
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| 115 | if format2 == 'ASAP': |
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[116] | 116 | self._save(name) |
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| 117 | else: |
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[989] | 118 | from asap._asap import stwriter as stw |
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[1118] | 119 | writer = stw(format2) |
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| 120 | writer.write(self, name) |
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[718] | 121 | print_log() |
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[116] | 122 | return |
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| 123 | |
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[102] | 124 | def copy(self): |
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| 125 | """ |
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| 126 | Return a copy of this scantable. |
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[1348] | 127 | Note: |
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| 128 | This makes a full (deep) copy. scan2 = scan1 makes a reference. |
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[102] | 129 | Parameters: |
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[113] | 130 | none |
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[102] | 131 | Example: |
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| 132 | copiedscan = scan.copy() |
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| 133 | """ |
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[876] | 134 | sd = scantable(Scantable._copy(self)) |
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[113] | 135 | return sd |
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| 136 | |
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[1093] | 137 | def drop_scan(self, scanid=None): |
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| 138 | """ |
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| 139 | Return a new scantable where the specified scan number(s) has(have) |
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| 140 | been dropped. |
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| 141 | Parameters: |
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| 142 | scanid: a (list of) scan number(s) |
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| 143 | """ |
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| 144 | from asap import _is_sequence_or_number as _is_valid |
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| 145 | from asap import _to_list |
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| 146 | from asap import unique |
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| 147 | if not _is_valid(scanid): |
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| 148 | if rcParams['verbose']: |
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| 149 | print "Please specify a scanno to drop from the scantable" |
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| 150 | return |
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| 151 | else: |
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| 152 | raise RuntimeError("No scan given") |
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| 153 | try: |
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| 154 | scanid = _to_list(scanid) |
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| 155 | allscans = unique([ self.getscan(i) for i in range(self.nrow())]) |
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| 156 | for sid in scanid: allscans.remove(sid) |
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[1118] | 157 | if len(allscans) == 0: |
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| 158 | raise ValueError("Can't remove all scans") |
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[1093] | 159 | except ValueError: |
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| 160 | if rcParams['verbose']: |
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| 161 | print "Couldn't find any match." |
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| 162 | return |
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| 163 | else: raise |
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| 164 | try: |
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| 165 | bsel = self.get_selection() |
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| 166 | sel = selector() |
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| 167 | sel.set_scans(allscans) |
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| 168 | self.set_selection(bsel+sel) |
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| 169 | scopy = self._copy() |
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| 170 | self.set_selection(bsel) |
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| 171 | return scantable(scopy) |
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| 172 | except RuntimeError: |
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[1118] | 173 | if rcParams['verbose']: |
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| 174 | print "Couldn't find any match." |
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| 175 | else: |
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| 176 | raise |
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[1093] | 177 | |
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| 178 | |
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[102] | 179 | def get_scan(self, scanid=None): |
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| 180 | """ |
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| 181 | Return a specific scan (by scanno) or collection of scans (by |
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| 182 | source name) in a new scantable. |
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[1348] | 183 | Note: |
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| 184 | See scantable.drop_scan() for the inverse operation. |
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[102] | 185 | Parameters: |
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[513] | 186 | scanid: a (list of) scanno or a source name, unix-style |
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| 187 | patterns are accepted for source name matching, e.g. |
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| 188 | '*_R' gets all 'ref scans |
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[102] | 189 | Example: |
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[513] | 190 | # get all scans containing the source '323p459' |
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| 191 | newscan = scan.get_scan('323p459') |
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| 192 | # get all 'off' scans |
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| 193 | refscans = scan.get_scan('*_R') |
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| 194 | # get a susbset of scans by scanno (as listed in scan.summary()) |
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[1118] | 195 | newscan = scan.get_scan([0, 2, 7, 10]) |
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[102] | 196 | """ |
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| 197 | if scanid is None: |
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[718] | 198 | if rcParams['verbose']: |
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[1118] | 199 | print "Please specify a scan no or name to " \ |
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| 200 | "retrieve from the scantable" |
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[718] | 201 | return |
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| 202 | else: |
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| 203 | raise RuntimeError("No scan given") |
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| 204 | |
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[102] | 205 | try: |
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[946] | 206 | bsel = self.get_selection() |
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| 207 | sel = selector() |
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[102] | 208 | if type(scanid) is str: |
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[946] | 209 | sel.set_name(scanid) |
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| 210 | self.set_selection(bsel+sel) |
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[876] | 211 | scopy = self._copy() |
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[946] | 212 | self.set_selection(bsel) |
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[876] | 213 | return scantable(scopy) |
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[102] | 214 | elif type(scanid) is int: |
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[946] | 215 | sel.set_scans([scanid]) |
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| 216 | self.set_selection(bsel+sel) |
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[876] | 217 | scopy = self._copy() |
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[946] | 218 | self.set_selection(bsel) |
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[876] | 219 | return scantable(scopy) |
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[381] | 220 | elif type(scanid) is list: |
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[946] | 221 | sel.set_scans(scanid) |
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| 222 | self.set_selection(sel) |
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[876] | 223 | scopy = self._copy() |
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[946] | 224 | self.set_selection(bsel) |
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[876] | 225 | return scantable(scopy) |
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[381] | 226 | else: |
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[718] | 227 | msg = "Illegal scanid type, use 'int' or 'list' if ints." |
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| 228 | if rcParams['verbose']: |
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| 229 | print msg |
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| 230 | else: |
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| 231 | raise TypeError(msg) |
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[102] | 232 | except RuntimeError: |
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[718] | 233 | if rcParams['verbose']: print "Couldn't find any match." |
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| 234 | else: raise |
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[102] | 235 | |
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| 236 | def __str__(self): |
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[1118] | 237 | return Scantable._summary(self, True) |
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[102] | 238 | |
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[976] | 239 | def summary(self, filename=None): |
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[102] | 240 | """ |
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| 241 | Print a summary of the contents of this scantable. |
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| 242 | Parameters: |
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| 243 | filename: the name of a file to write the putput to |
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| 244 | Default - no file output |
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[381] | 245 | verbose: print extra info such as the frequency table |
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| 246 | The default (False) is taken from .asaprc |
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[102] | 247 | """ |
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[976] | 248 | info = Scantable._summary(self, True) |
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| 249 | #if verbose is None: verbose = rcParams['scantable.verbosesummary'] |
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[102] | 250 | if filename is not None: |
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[256] | 251 | if filename is "": |
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| 252 | filename = 'scantable_summary.txt' |
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[415] | 253 | from os.path import expandvars, isdir |
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[411] | 254 | filename = expandvars(filename) |
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[415] | 255 | if not isdir(filename): |
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[413] | 256 | data = open(filename, 'w') |
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| 257 | data.write(info) |
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| 258 | data.close() |
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| 259 | else: |
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[718] | 260 | msg = "Illegal file name '%s'." % (filename) |
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| 261 | if rcParams['verbose']: |
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| 262 | print msg |
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| 263 | else: |
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| 264 | raise IOError(msg) |
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| 265 | if rcParams['verbose']: |
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[794] | 266 | try: |
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| 267 | from IPython.genutils import page as pager |
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| 268 | except ImportError: |
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| 269 | from pydoc import pager |
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| 270 | pager(info) |
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[718] | 271 | else: |
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| 272 | return info |
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[710] | 273 | |
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[946] | 274 | |
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| 275 | def get_selection(self): |
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| 276 | """ |
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[1005] | 277 | Get the selection object currently set on this scantable. |
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| 278 | Parameters: |
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| 279 | none |
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| 280 | Example: |
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| 281 | sel = scan.get_selection() |
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| 282 | sel.set_ifs(0) # select IF 0 |
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| 283 | scan.set_selection(sel) # apply modified selection |
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[946] | 284 | """ |
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| 285 | return selector(self._getselection()) |
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| 286 | |
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[1005] | 287 | def set_selection(self, selection=selector()): |
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[946] | 288 | """ |
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[1005] | 289 | Select a subset of the data. All following operations on this scantable |
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| 290 | are only applied to thi selection. |
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| 291 | Parameters: |
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| 292 | selection: a selector object (default unset the selection) |
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| 293 | Examples: |
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| 294 | sel = selector() # create a selection object |
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[1118] | 295 | self.set_scans([0, 3]) # select SCANNO 0 and 3 |
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[1005] | 296 | scan.set_selection(sel) # set the selection |
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| 297 | scan.summary() # will only print summary of scanno 0 an 3 |
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| 298 | scan.set_selection() # unset the selection |
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[946] | 299 | """ |
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| 300 | self._setselection(selection) |
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| 301 | |
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[876] | 302 | def stats(self, stat='stddev', mask=None): |
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[102] | 303 | """ |
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[135] | 304 | Determine the specified statistic of the current beam/if/pol |
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[102] | 305 | Takes a 'mask' as an optional parameter to specify which |
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| 306 | channels should be excluded. |
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| 307 | Parameters: |
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[135] | 308 | stat: 'min', 'max', 'sumsq', 'sum', 'mean' |
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| 309 | 'var', 'stddev', 'avdev', 'rms', 'median' |
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| 310 | mask: an optional mask specifying where the statistic |
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[102] | 311 | should be determined. |
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| 312 | Example: |
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[113] | 313 | scan.set_unit('channel') |
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[1118] | 314 | msk = scan.create_mask([100, 200], [500, 600]) |
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[135] | 315 | scan.stats(stat='mean', mask=m) |
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[102] | 316 | """ |
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| 317 | if mask == None: |
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[876] | 318 | mask = [] |
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[1118] | 319 | axes = ['Beam', 'IF', 'Pol', 'Time'] |
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[876] | 320 | if not self._check_ifs(): |
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[1118] | 321 | raise ValueError("Cannot apply mask as the IFs have different " |
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| 322 | "number of channels. Please use setselection() " |
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| 323 | "to select individual IFs") |
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[256] | 324 | |
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[876] | 325 | statvals = self._math._stats(self, mask, stat) |
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| 326 | out = '' |
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| 327 | axes = [] |
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| 328 | for i in range(self.nrow()): |
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| 329 | axis = [] |
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| 330 | axis.append(self.getscan(i)) |
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| 331 | axis.append(self.getbeam(i)) |
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| 332 | axis.append(self.getif(i)) |
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| 333 | axis.append(self.getpol(i)) |
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| 334 | axis.append(self.getcycle(i)) |
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| 335 | axes.append(axis) |
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| 336 | tm = self._gettime(i) |
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| 337 | src = self._getsourcename(i) |
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| 338 | out += 'Scan[%d] (%s) ' % (axis[0], src) |
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| 339 | out += 'Time[%s]:\n' % (tm) |
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| 340 | if self.nbeam(-1) > 1: out += ' Beam[%d] ' % (axis[1]) |
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| 341 | if self.nif(-1) > 1: out += ' IF[%d] ' % (axis[2]) |
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| 342 | if self.npol(-1) > 1: out += ' Pol[%d] ' % (axis[3]) |
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| 343 | out += '= %3.3f\n' % (statvals[i]) |
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| 344 | out += "--------------------------------------------------\n" |
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[256] | 345 | |
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[876] | 346 | if rcParams['verbose']: |
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| 347 | print "--------------------------------------------------" |
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[1118] | 348 | print " ", stat |
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[876] | 349 | print "--------------------------------------------------" |
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| 350 | print out |
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[1295] | 351 | #else: |
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| 352 | #retval = { 'axesnames': ['scanno', 'beamno', 'ifno', 'polno', 'cycleno'], |
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| 353 | # 'axes' : axes, |
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| 354 | # 'data': statvals} |
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| 355 | return statvals |
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[102] | 356 | |
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[1118] | 357 | def stddev(self, mask=None): |
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[135] | 358 | """ |
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| 359 | Determine the standard deviation of the current beam/if/pol |
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| 360 | Takes a 'mask' as an optional parameter to specify which |
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| 361 | channels should be excluded. |
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| 362 | Parameters: |
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| 363 | mask: an optional mask specifying where the standard |
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| 364 | deviation should be determined. |
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| 365 | |
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| 366 | Example: |
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| 367 | scan.set_unit('channel') |
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[1118] | 368 | msk = scan.create_mask([100, 200], [500, 600]) |
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[135] | 369 | scan.stddev(mask=m) |
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| 370 | """ |
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[1118] | 371 | return self.stats(stat='stddev', mask=mask); |
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[135] | 372 | |
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[1003] | 373 | |
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[1259] | 374 | def get_column_names(self): |
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[1003] | 375 | """ |
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| 376 | Return a list of column names, which can be used for selection. |
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| 377 | """ |
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[1259] | 378 | return list(Scantable.get_column_names(self)) |
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[1003] | 379 | |
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[876] | 380 | def get_tsys(self): |
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[113] | 381 | """ |
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| 382 | Return the System temperatures. |
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| 383 | Returns: |
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[876] | 384 | a list of Tsys values for the current selection |
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[113] | 385 | """ |
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[256] | 386 | |
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[876] | 387 | return self._row_callback(self._gettsys, "Tsys") |
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[256] | 388 | |
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[876] | 389 | def _row_callback(self, callback, label): |
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| 390 | axes = [] |
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[1118] | 391 | axesnames = ['scanno', 'beamno', 'ifno', 'polno', 'cycleno'] |
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[876] | 392 | out = "" |
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[1118] | 393 | outvec = [] |
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[876] | 394 | for i in range(self.nrow()): |
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| 395 | axis = [] |
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| 396 | axis.append(self.getscan(i)) |
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| 397 | axis.append(self.getbeam(i)) |
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| 398 | axis.append(self.getif(i)) |
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| 399 | axis.append(self.getpol(i)) |
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| 400 | axis.append(self.getcycle(i)) |
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| 401 | axes.append(axis) |
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| 402 | tm = self._gettime(i) |
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| 403 | src = self._getsourcename(i) |
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| 404 | out += 'Scan[%d] (%s) ' % (axis[0], src) |
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| 405 | out += 'Time[%s]:\n' % (tm) |
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| 406 | if self.nbeam(-1) > 1: out += ' Beam[%d] ' % (axis[1]) |
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| 407 | if self.nif(-1) > 1: out += ' IF[%d] ' % (axis[2]) |
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| 408 | if self.npol(-1) > 1: out += ' Pol[%d] ' % (axis[3]) |
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| 409 | outvec.append(callback(i)) |
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| 410 | out += '= %3.3f\n' % (outvec[i]) |
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| 411 | out += "--------------------------------------------------\n" |
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| 412 | if rcParams['verbose']: |
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| 413 | print "--------------------------------------------------" |
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| 414 | print " %s" % (label) |
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| 415 | print "--------------------------------------------------" |
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| 416 | print out |
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[1175] | 417 | # disabled because the vector seems more useful |
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| 418 | #retval = {'axesnames': axesnames, 'axes': axes, 'data': outvec} |
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| 419 | return outvec |
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[256] | 420 | |
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[1070] | 421 | def _get_column(self, callback, row=-1): |
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| 422 | """ |
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| 423 | """ |
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| 424 | if row == -1: |
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| 425 | return [callback(i) for i in range(self.nrow())] |
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| 426 | else: |
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| 427 | if 0 <= row < self.nrow(): |
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| 428 | return callback(row) |
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[256] | 429 | |
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[1070] | 430 | |
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[1348] | 431 | def get_time(self, row=-1, asdatetime=False): |
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[113] | 432 | """ |
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| 433 | Get a list of time stamps for the observations. |
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[1348] | 434 | Return a datetime object for each integration time stamp in the scantable. |
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[113] | 435 | Parameters: |
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[1348] | 436 | row: row no of integration. Default -1 return all rows |
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| 437 | asdatetime: return values as datetime objects rather than strings |
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[113] | 438 | Example: |
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| 439 | none |
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| 440 | """ |
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[1175] | 441 | from time import strptime |
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| 442 | from datetime import datetime |
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[1348] | 443 | if not asdatetime: |
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| 444 | return self._get_column(self._gettime, row) |
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[1175] | 445 | format = "%Y/%m/%d/%H:%M:%S" |
---|
| 446 | if isinstance(times, list): |
---|
| 447 | return [datetime(*strptime(i, format)[:6]) for i in times] |
---|
| 448 | else: |
---|
| 449 | return datetime(*strptime(times, format)[:6]) |
---|
[102] | 450 | |
---|
[1348] | 451 | |
---|
| 452 | def get_inttime(self, row=-1): |
---|
| 453 | """ |
---|
| 454 | Get a list of integration times for the observations. |
---|
| 455 | Return a time in seconds for each integration in the scantable. |
---|
| 456 | Parameters: |
---|
| 457 | row: row no of integration. Default -1 return all rows. |
---|
| 458 | Example: |
---|
| 459 | none |
---|
| 460 | """ |
---|
| 461 | return self._get_column(self._getinttime, row) |
---|
| 462 | |
---|
| 463 | |
---|
[714] | 464 | def get_sourcename(self, row=-1): |
---|
| 465 | """ |
---|
[794] | 466 | Get a list source names for the observations. |
---|
[714] | 467 | Return a string for each integration in the scantable. |
---|
| 468 | Parameters: |
---|
[1348] | 469 | row: row no of integration. Default -1 return all rows. |
---|
[714] | 470 | Example: |
---|
| 471 | none |
---|
| 472 | """ |
---|
[1070] | 473 | return self._get_column(self._getsourcename, row) |
---|
[714] | 474 | |
---|
[794] | 475 | def get_elevation(self, row=-1): |
---|
| 476 | """ |
---|
| 477 | Get a list of elevations for the observations. |
---|
| 478 | Return a float for each integration in the scantable. |
---|
| 479 | Parameters: |
---|
[1348] | 480 | row: row no of integration. Default -1 return all rows. |
---|
[794] | 481 | Example: |
---|
| 482 | none |
---|
| 483 | """ |
---|
[1070] | 484 | return self._get_column(self._getelevation, row) |
---|
[794] | 485 | |
---|
| 486 | def get_azimuth(self, row=-1): |
---|
| 487 | """ |
---|
| 488 | Get a list of azimuths for the observations. |
---|
| 489 | Return a float for each integration in the scantable. |
---|
| 490 | Parameters: |
---|
[1348] | 491 | row: row no of integration. Default -1 return all rows. |
---|
[794] | 492 | Example: |
---|
| 493 | none |
---|
| 494 | """ |
---|
[1070] | 495 | return self._get_column(self._getazimuth, row) |
---|
[794] | 496 | |
---|
| 497 | def get_parangle(self, row=-1): |
---|
| 498 | """ |
---|
| 499 | Get a list of parallactic angles for the observations. |
---|
| 500 | Return a float for each integration in the scantable. |
---|
| 501 | Parameters: |
---|
[1348] | 502 | row: row no of integration. Default -1 return all rows. |
---|
[794] | 503 | Example: |
---|
| 504 | none |
---|
| 505 | """ |
---|
[1070] | 506 | return self._get_column(self._getparangle, row) |
---|
[794] | 507 | |
---|
[1070] | 508 | def get_direction(self, row=-1): |
---|
| 509 | """ |
---|
| 510 | Get a list of Positions on the sky (direction) for the observations. |
---|
| 511 | Return a float for each integration in the scantable. |
---|
| 512 | Parameters: |
---|
| 513 | row: row no of integration. Default -1 return all rows |
---|
| 514 | Example: |
---|
| 515 | none |
---|
| 516 | """ |
---|
| 517 | return self._get_column(self._getdirection, row) |
---|
| 518 | |
---|
[102] | 519 | def set_unit(self, unit='channel'): |
---|
| 520 | """ |
---|
| 521 | Set the unit for all following operations on this scantable |
---|
| 522 | Parameters: |
---|
| 523 | unit: optional unit, default is 'channel' |
---|
[1118] | 524 | one of '*Hz', 'km/s', 'channel', '' |
---|
[102] | 525 | """ |
---|
[484] | 526 | varlist = vars() |
---|
[1118] | 527 | if unit in ['', 'pixel', 'channel']: |
---|
[113] | 528 | unit = '' |
---|
| 529 | inf = list(self._getcoordinfo()) |
---|
| 530 | inf[0] = unit |
---|
| 531 | self._setcoordinfo(inf) |
---|
[1118] | 532 | self._add_history("set_unit", varlist) |
---|
[113] | 533 | |
---|
[484] | 534 | def set_instrument(self, instr): |
---|
[358] | 535 | """ |
---|
[1348] | 536 | Set the instrument for subsequent processing. |
---|
[358] | 537 | Parameters: |
---|
[710] | 538 | instr: Select from 'ATPKSMB', 'ATPKSHOH', 'ATMOPRA', |
---|
[407] | 539 | 'DSS-43' (Tid), 'CEDUNA', and 'HOBART' |
---|
[358] | 540 | """ |
---|
| 541 | self._setInstrument(instr) |
---|
[1118] | 542 | self._add_history("set_instument", vars()) |
---|
[718] | 543 | print_log() |
---|
[358] | 544 | |
---|
[1190] | 545 | def set_feedtype(self, feedtype): |
---|
| 546 | """ |
---|
| 547 | Overwrite the feed type, which might not be set correctly. |
---|
| 548 | Parameters: |
---|
| 549 | feedtype: 'linear' or 'circular' |
---|
| 550 | """ |
---|
| 551 | self._setfeedtype(feedtype) |
---|
| 552 | self._add_history("set_feedtype", vars()) |
---|
| 553 | print_log() |
---|
| 554 | |
---|
[276] | 555 | def set_doppler(self, doppler='RADIO'): |
---|
| 556 | """ |
---|
| 557 | Set the doppler for all following operations on this scantable. |
---|
| 558 | Parameters: |
---|
| 559 | doppler: One of 'RADIO', 'OPTICAL', 'Z', 'BETA', 'GAMMA' |
---|
| 560 | """ |
---|
[484] | 561 | varlist = vars() |
---|
[276] | 562 | inf = list(self._getcoordinfo()) |
---|
| 563 | inf[2] = doppler |
---|
| 564 | self._setcoordinfo(inf) |
---|
[1118] | 565 | self._add_history("set_doppler", vars()) |
---|
[718] | 566 | print_log() |
---|
[710] | 567 | |
---|
[226] | 568 | def set_freqframe(self, frame=None): |
---|
[113] | 569 | """ |
---|
| 570 | Set the frame type of the Spectral Axis. |
---|
| 571 | Parameters: |
---|
[591] | 572 | frame: an optional frame type, default 'LSRK'. Valid frames are: |
---|
[1118] | 573 | 'REST', 'TOPO', 'LSRD', 'LSRK', 'BARY', |
---|
| 574 | 'GEO', 'GALACTO', 'LGROUP', 'CMB' |
---|
[113] | 575 | Examples: |
---|
| 576 | scan.set_freqframe('BARY') |
---|
| 577 | """ |
---|
[484] | 578 | if frame is None: frame = rcParams['scantable.freqframe'] |
---|
| 579 | varlist = vars() |
---|
[1118] | 580 | valid = ['REST', 'TOPO', 'LSRD', 'LSRK', 'BARY', \ |
---|
| 581 | 'GEO', 'GALACTO', 'LGROUP', 'CMB'] |
---|
[591] | 582 | |
---|
[989] | 583 | if frame in valid: |
---|
[113] | 584 | inf = list(self._getcoordinfo()) |
---|
| 585 | inf[1] = frame |
---|
| 586 | self._setcoordinfo(inf) |
---|
[1118] | 587 | self._add_history("set_freqframe", varlist) |
---|
[102] | 588 | else: |
---|
[1118] | 589 | msg = "Please specify a valid freq type. Valid types are:\n", valid |
---|
[718] | 590 | if rcParams['verbose']: |
---|
| 591 | print msg |
---|
| 592 | else: |
---|
| 593 | raise TypeError(msg) |
---|
| 594 | print_log() |
---|
[710] | 595 | |
---|
[989] | 596 | def set_dirframe(self, frame=""): |
---|
| 597 | """ |
---|
| 598 | Set the frame type of the Direction on the sky. |
---|
| 599 | Parameters: |
---|
| 600 | frame: an optional frame type, default ''. Valid frames are: |
---|
| 601 | 'J2000', 'B1950', 'GALACTIC' |
---|
| 602 | Examples: |
---|
| 603 | scan.set_dirframe('GALACTIC') |
---|
| 604 | """ |
---|
| 605 | varlist = vars() |
---|
| 606 | try: |
---|
| 607 | Scantable.set_dirframe(self, frame) |
---|
[1118] | 608 | except RuntimeError, msg: |
---|
[989] | 609 | if rcParams['verbose']: |
---|
| 610 | print msg |
---|
| 611 | else: |
---|
| 612 | raise |
---|
[1118] | 613 | self._add_history("set_dirframe", varlist) |
---|
[989] | 614 | |
---|
[113] | 615 | def get_unit(self): |
---|
| 616 | """ |
---|
| 617 | Get the default unit set in this scantable |
---|
| 618 | Returns: |
---|
| 619 | A unit string |
---|
| 620 | """ |
---|
| 621 | inf = self._getcoordinfo() |
---|
| 622 | unit = inf[0] |
---|
| 623 | if unit == '': unit = 'channel' |
---|
| 624 | return unit |
---|
[102] | 625 | |
---|
[158] | 626 | def get_abcissa(self, rowno=0): |
---|
[102] | 627 | """ |
---|
[158] | 628 | Get the abcissa in the current coordinate setup for the currently |
---|
[113] | 629 | selected Beam/IF/Pol |
---|
| 630 | Parameters: |
---|
[226] | 631 | rowno: an optional row number in the scantable. Default is the |
---|
| 632 | first row, i.e. rowno=0 |
---|
[113] | 633 | Returns: |
---|
[1348] | 634 | The abcissa values and the format string (as a dictionary) |
---|
[113] | 635 | """ |
---|
[256] | 636 | abc = self._getabcissa(rowno) |
---|
[710] | 637 | lbl = self._getabcissalabel(rowno) |
---|
[718] | 638 | print_log() |
---|
[158] | 639 | return abc, lbl |
---|
[113] | 640 | |
---|
[1118] | 641 | def flag(self, mask=None): |
---|
[1001] | 642 | """ |
---|
| 643 | Flag the selected data using an optional channel mask. |
---|
| 644 | Parameters: |
---|
| 645 | mask: an optional channel mask, created with create_mask. Default |
---|
| 646 | (no mask) is all channels. |
---|
| 647 | """ |
---|
| 648 | varlist = vars() |
---|
[1118] | 649 | if mask is None: |
---|
| 650 | mask = [] |
---|
[1001] | 651 | try: |
---|
| 652 | self._flag(mask) |
---|
[1118] | 653 | except RuntimeError, msg: |
---|
[1001] | 654 | if rcParams['verbose']: |
---|
| 655 | print msg |
---|
| 656 | return |
---|
| 657 | else: raise |
---|
| 658 | self._add_history("flag", varlist) |
---|
| 659 | |
---|
[1203] | 660 | def lag_flag(self, frequency, width=0.0, unit="GHz", insitu=None): |
---|
[1192] | 661 | """ |
---|
| 662 | Flag the data in 'lag' space by providing a frequency to remove. |
---|
| 663 | Flagged data in the scantable gets set to 0.0 before the fft. |
---|
| 664 | No taper is applied. |
---|
| 665 | Parameters: |
---|
[1348] | 666 | frequency: the frequency (really a period within the bandwidth) |
---|
| 667 | to remove |
---|
| 668 | width: the width of the frequency to remove, to remove a |
---|
| 669 | range of frequencies aroung the centre. |
---|
[1203] | 670 | unit: the frequency unit (default "GHz") |
---|
| 671 | Notes: |
---|
[1348] | 672 | It is recommended to flag edges of the band or strong |
---|
| 673 | signals beforehand. |
---|
[1192] | 674 | """ |
---|
| 675 | if insitu is None: insitu = rcParams['insitu'] |
---|
| 676 | self._math._setinsitu(insitu) |
---|
| 677 | varlist = vars() |
---|
| 678 | base = { "GHz": 100000000., "MHz": 1000000., "kHz": 1000., "Hz": 1. } |
---|
| 679 | if not base.has_key(unit): |
---|
| 680 | raise ValueError("%s is not a valid unit." % unit) |
---|
| 681 | try: |
---|
[1200] | 682 | s = scantable(self._math._lag_flag(self, frequency*base[unit], |
---|
| 683 | width*base[unit])) |
---|
[1192] | 684 | except RuntimeError, msg: |
---|
| 685 | if rcParams['verbose']: |
---|
| 686 | print msg |
---|
| 687 | return |
---|
| 688 | else: raise |
---|
| 689 | s._add_history("lag_flag", varlist) |
---|
| 690 | print_log() |
---|
| 691 | if insitu: |
---|
| 692 | self._assign(s) |
---|
| 693 | else: |
---|
| 694 | return s |
---|
[1001] | 695 | |
---|
[1192] | 696 | |
---|
[113] | 697 | def create_mask(self, *args, **kwargs): |
---|
| 698 | """ |
---|
[1118] | 699 | Compute and return a mask based on [min, max] windows. |
---|
[189] | 700 | The specified windows are to be INCLUDED, when the mask is |
---|
[113] | 701 | applied. |
---|
[102] | 702 | Parameters: |
---|
[1118] | 703 | [min, max], [min2, max2], ... |
---|
[1024] | 704 | Pairs of start/end points (inclusive)specifying the regions |
---|
[102] | 705 | to be masked |
---|
[189] | 706 | invert: optional argument. If specified as True, |
---|
| 707 | return an inverted mask, i.e. the regions |
---|
| 708 | specified are EXCLUDED |
---|
[513] | 709 | row: create the mask using the specified row for |
---|
| 710 | unit conversions, default is row=0 |
---|
| 711 | only necessary if frequency varies over rows. |
---|
[102] | 712 | Example: |
---|
[113] | 713 | scan.set_unit('channel') |
---|
| 714 | a) |
---|
[1118] | 715 | msk = scan.create_mask([400, 500], [800, 900]) |
---|
[189] | 716 | # masks everything outside 400 and 500 |
---|
[113] | 717 | # and 800 and 900 in the unit 'channel' |
---|
| 718 | |
---|
| 719 | b) |
---|
[1118] | 720 | msk = scan.create_mask([400, 500], [800, 900], invert=True) |
---|
[189] | 721 | # masks the regions between 400 and 500 |
---|
[113] | 722 | # and 800 and 900 in the unit 'channel' |
---|
[1024] | 723 | c) |
---|
| 724 | mask only channel 400 |
---|
[1118] | 725 | msk = scan.create_mask([400, 400]) |
---|
[102] | 726 | """ |
---|
[513] | 727 | row = 0 |
---|
| 728 | if kwargs.has_key("row"): |
---|
| 729 | row = kwargs.get("row") |
---|
| 730 | data = self._getabcissa(row) |
---|
[113] | 731 | u = self._getcoordinfo()[0] |
---|
[718] | 732 | if rcParams['verbose']: |
---|
[113] | 733 | if u == "": u = "channel" |
---|
[718] | 734 | msg = "The current mask window unit is %s" % u |
---|
[1118] | 735 | i = self._check_ifs() |
---|
| 736 | if not i: |
---|
[876] | 737 | msg += "\nThis mask is only valid for IF=%d" % (self.getif(i)) |
---|
[718] | 738 | asaplog.push(msg) |
---|
[102] | 739 | n = self.nchan() |
---|
[1295] | 740 | msk = _n_bools(n, False) |
---|
[710] | 741 | # test if args is a 'list' or a 'normal *args - UGLY!!! |
---|
| 742 | |
---|
[1118] | 743 | ws = (isinstance(args[-1][-1], int) or isinstance(args[-1][-1], float)) \ |
---|
| 744 | and args or args[0] |
---|
[710] | 745 | for window in ws: |
---|
[102] | 746 | if (len(window) != 2 or window[0] > window[1] ): |
---|
[1118] | 747 | raise TypeError("A window needs to be defined as [min, max]") |
---|
[102] | 748 | for i in range(n): |
---|
[1024] | 749 | if data[i] >= window[0] and data[i] <= window[1]: |
---|
[1295] | 750 | msk[i] = True |
---|
[113] | 751 | if kwargs.has_key('invert'): |
---|
| 752 | if kwargs.get('invert'): |
---|
[1295] | 753 | msk = mask_not(msk) |
---|
[718] | 754 | print_log() |
---|
[102] | 755 | return msk |
---|
[710] | 756 | |
---|
[256] | 757 | def get_restfreqs(self): |
---|
| 758 | """ |
---|
| 759 | Get the restfrequency(s) stored in this scantable. |
---|
| 760 | The return value(s) are always of unit 'Hz' |
---|
| 761 | Parameters: |
---|
| 762 | none |
---|
| 763 | Returns: |
---|
| 764 | a list of doubles |
---|
| 765 | """ |
---|
| 766 | return list(self._getrestfreqs()) |
---|
[102] | 767 | |
---|
[402] | 768 | |
---|
[931] | 769 | def set_restfreqs(self, freqs=None, unit='Hz'): |
---|
| 770 | """ |
---|
| 771 | Set or replace the restfrequency specified and |
---|
| 772 | If the 'freqs' argument holds a scalar, |
---|
| 773 | then that rest frequency will be applied to all the selected |
---|
| 774 | data. If the 'freqs' argument holds |
---|
| 775 | a vector, then it MUST be of equal or smaller length than |
---|
| 776 | the number of IFs (and the available restfrequencies will be |
---|
| 777 | replaced by this vector). In this case, *all* data have |
---|
| 778 | the restfrequency set per IF according |
---|
| 779 | to the corresponding value you give in the 'freqs' vector. |
---|
[1118] | 780 | E.g. 'freqs=[1e9, 2e9]' would mean IF 0 gets restfreq 1e9 and |
---|
[931] | 781 | IF 1 gets restfreq 2e9. |
---|
[1153] | 782 | You can also specify the frequencies via a linecatalog/ |
---|
| 783 | |
---|
[931] | 784 | Parameters: |
---|
| 785 | freqs: list of rest frequency values or string idenitfiers |
---|
| 786 | unit: unit for rest frequency (default 'Hz') |
---|
[402] | 787 | |
---|
[931] | 788 | Example: |
---|
| 789 | # set the given restfrequency for the whole table |
---|
| 790 | scan.set_restfreqs(freqs=1.4e9) |
---|
[1348] | 791 | # If thee number of IFs in the data is >= 2 IF0 gets the first |
---|
[931] | 792 | # value IF1 the second... |
---|
[1118] | 793 | scan.set_restfreqs(freqs=[1.4e9, 1.67e9]) |
---|
[931] | 794 | #set the given restfrequency for the whole table (by name) |
---|
| 795 | scan.set_restfreqs(freqs="OH1667") |
---|
[391] | 796 | |
---|
[931] | 797 | Note: |
---|
| 798 | To do more sophisticate Restfrequency setting, e.g. on a |
---|
| 799 | source and IF basis, use scantable.set_selection() before using |
---|
| 800 | this function. |
---|
| 801 | # provide your scantable is call scan |
---|
| 802 | selection = selector() |
---|
| 803 | selection.set_name("ORION*") |
---|
| 804 | selection.set_ifs([1]) |
---|
| 805 | scan.set_selection(selection) |
---|
| 806 | scan.set_restfreqs(freqs=86.6e9) |
---|
| 807 | |
---|
| 808 | """ |
---|
| 809 | varlist = vars() |
---|
[1157] | 810 | from asap import linecatalog |
---|
| 811 | # simple value |
---|
[1118] | 812 | if isinstance(freqs, int) or isinstance(freqs, float): |
---|
[1153] | 813 | self._setrestfreqs(freqs, "",unit) |
---|
[1157] | 814 | # list of values |
---|
[1118] | 815 | elif isinstance(freqs, list) or isinstance(freqs, tuple): |
---|
[1157] | 816 | # list values are scalars |
---|
[1118] | 817 | if isinstance(freqs[-1], int) or isinstance(freqs[-1], float): |
---|
[931] | 818 | sel = selector() |
---|
| 819 | savesel = self._getselection() |
---|
[1322] | 820 | iflist = self.getifnos() |
---|
[931] | 821 | for i in xrange(len(freqs)): |
---|
[1322] | 822 | sel.set_ifs(iflist[i]) |
---|
[931] | 823 | self._setselection(sel) |
---|
[1153] | 824 | self._setrestfreqs(freqs[i], "",unit) |
---|
[931] | 825 | self._setselection(savesel) |
---|
[1157] | 826 | # list values are tuples, (value, name) |
---|
| 827 | elif isinstance(freqs[-1], dict): |
---|
| 828 | sel = selector() |
---|
| 829 | savesel = self._getselection() |
---|
[1322] | 830 | iflist = self.getifnos() |
---|
[1157] | 831 | for i in xrange(len(freqs)): |
---|
[1322] | 832 | sel.set_ifs(iflist[i]) |
---|
[1259] | 833 | self._setselection(sel) |
---|
[1157] | 834 | self._setrestfreqs(freqs[i]["value"], |
---|
| 835 | freqs[i]["name"], "MHz") |
---|
| 836 | self._setselection(savesel) |
---|
| 837 | # freqs are to be taken from a linecatalog |
---|
[1153] | 838 | elif isinstance(freqs, linecatalog): |
---|
| 839 | sel = selector() |
---|
| 840 | savesel = self._getselection() |
---|
[1322] | 841 | iflist = self.getifnos() |
---|
[1153] | 842 | for i in xrange(freqs.nrow()): |
---|
[1322] | 843 | sel.set_ifs(iflist[i]) |
---|
[1153] | 844 | self._setselection(sel) |
---|
| 845 | self._setrestfreqs(freqs.get_frequency(i), |
---|
| 846 | freqs.get_name(i), "MHz") |
---|
| 847 | # ensure that we are not iterating past nIF |
---|
| 848 | if i == self.nif()-1: break |
---|
| 849 | self._setselection(savesel) |
---|
[931] | 850 | else: |
---|
| 851 | return |
---|
| 852 | self._add_history("set_restfreqs", varlist) |
---|
| 853 | |
---|
| 854 | |
---|
| 855 | |
---|
[1259] | 856 | def history(self, filename=None): |
---|
| 857 | """ |
---|
| 858 | Print the history. Optionally to a file. |
---|
[1348] | 859 | Parameters: |
---|
| 860 | filename: The name of the file to save the history to. |
---|
[1259] | 861 | """ |
---|
[484] | 862 | hist = list(self._gethistory()) |
---|
[794] | 863 | out = "-"*80 |
---|
[484] | 864 | for h in hist: |
---|
[489] | 865 | if h.startswith("---"): |
---|
[794] | 866 | out += "\n"+h |
---|
[489] | 867 | else: |
---|
| 868 | items = h.split("##") |
---|
| 869 | date = items[0] |
---|
| 870 | func = items[1] |
---|
| 871 | items = items[2:] |
---|
[794] | 872 | out += "\n"+date+"\n" |
---|
| 873 | out += "Function: %s\n Parameters:" % (func) |
---|
[489] | 874 | for i in items: |
---|
| 875 | s = i.split("=") |
---|
[1118] | 876 | out += "\n %s = %s" % (s[0], s[1]) |
---|
[794] | 877 | out += "\n"+"-"*80 |
---|
[1259] | 878 | if filename is not None: |
---|
| 879 | if filename is "": |
---|
| 880 | filename = 'scantable_history.txt' |
---|
| 881 | import os |
---|
| 882 | filename = os.path.expandvars(os.path.expanduser(filename)) |
---|
| 883 | if not os.path.isdir(filename): |
---|
| 884 | data = open(filename, 'w') |
---|
| 885 | data.write(out) |
---|
| 886 | data.close() |
---|
| 887 | else: |
---|
| 888 | msg = "Illegal file name '%s'." % (filename) |
---|
| 889 | if rcParams['verbose']: |
---|
| 890 | print msg |
---|
| 891 | else: |
---|
| 892 | raise IOError(msg) |
---|
| 893 | if rcParams['verbose']: |
---|
| 894 | try: |
---|
| 895 | from IPython.genutils import page as pager |
---|
| 896 | except ImportError: |
---|
| 897 | from pydoc import pager |
---|
| 898 | pager(out) |
---|
| 899 | else: |
---|
| 900 | return out |
---|
[484] | 901 | return |
---|
[513] | 902 | # |
---|
| 903 | # Maths business |
---|
| 904 | # |
---|
| 905 | |
---|
[931] | 906 | def average_time(self, mask=None, scanav=False, weight='tint', align=False): |
---|
[513] | 907 | """ |
---|
[1070] | 908 | Return the (time) weighted average of a scan. |
---|
[513] | 909 | Note: |
---|
[1070] | 910 | in channels only - align if necessary |
---|
[513] | 911 | Parameters: |
---|
| 912 | mask: an optional mask (only used for 'var' and 'tsys' |
---|
| 913 | weighting) |
---|
[558] | 914 | scanav: True averages each scan separately |
---|
| 915 | False (default) averages all scans together, |
---|
[1099] | 916 | weight: Weighting scheme. |
---|
| 917 | 'none' (mean no weight) |
---|
| 918 | 'var' (1/var(spec) weighted) |
---|
| 919 | 'tsys' (1/Tsys**2 weighted) |
---|
| 920 | 'tint' (integration time weighted) |
---|
| 921 | 'tintsys' (Tint/Tsys**2) |
---|
| 922 | 'median' ( median averaging) |
---|
[535] | 923 | The default is 'tint' |
---|
[931] | 924 | align: align the spectra in velocity before averaging. It takes |
---|
| 925 | the time of the first spectrum as reference time. |
---|
[513] | 926 | Example: |
---|
| 927 | # time average the scantable without using a mask |
---|
[710] | 928 | newscan = scan.average_time() |
---|
[513] | 929 | """ |
---|
| 930 | varlist = vars() |
---|
[976] | 931 | if weight is None: weight = 'TINT' |
---|
[513] | 932 | if mask is None: mask = () |
---|
[1099] | 933 | if scanav: scanav = "SCAN" |
---|
| 934 | else: scanav = "NONE" |
---|
[1118] | 935 | scan = (self, ) |
---|
[989] | 936 | try: |
---|
[1118] | 937 | if align: |
---|
| 938 | scan = (self.freq_align(insitu=False), ) |
---|
| 939 | s = None |
---|
| 940 | if weight.upper() == 'MEDIAN': |
---|
| 941 | s = scantable(self._math._averagechannel(scan[0], 'MEDIAN', |
---|
| 942 | scanav)) |
---|
| 943 | else: |
---|
| 944 | s = scantable(self._math._average(scan, mask, weight.upper(), |
---|
| 945 | scanav)) |
---|
| 946 | except RuntimeError, msg: |
---|
[989] | 947 | if rcParams['verbose']: |
---|
| 948 | print msg |
---|
| 949 | return |
---|
| 950 | else: raise |
---|
[1099] | 951 | s._add_history("average_time", varlist) |
---|
[718] | 952 | print_log() |
---|
[513] | 953 | return s |
---|
[710] | 954 | |
---|
[876] | 955 | def convert_flux(self, jyperk=None, eta=None, d=None, insitu=None): |
---|
[513] | 956 | """ |
---|
| 957 | Return a scan where all spectra are converted to either |
---|
| 958 | Jansky or Kelvin depending upon the flux units of the scan table. |
---|
| 959 | By default the function tries to look the values up internally. |
---|
| 960 | If it can't find them (or if you want to over-ride), you must |
---|
| 961 | specify EITHER jyperk OR eta (and D which it will try to look up |
---|
| 962 | also if you don't set it). jyperk takes precedence if you set both. |
---|
| 963 | Parameters: |
---|
| 964 | jyperk: the Jy / K conversion factor |
---|
| 965 | eta: the aperture efficiency |
---|
| 966 | d: the geomtric diameter (metres) |
---|
| 967 | insitu: if False a new scantable is returned. |
---|
| 968 | Otherwise, the scaling is done in-situ |
---|
| 969 | The default is taken from .asaprc (False) |
---|
| 970 | """ |
---|
| 971 | if insitu is None: insitu = rcParams['insitu'] |
---|
[876] | 972 | self._math._setinsitu(insitu) |
---|
[513] | 973 | varlist = vars() |
---|
| 974 | if jyperk is None: jyperk = -1.0 |
---|
| 975 | if d is None: d = -1.0 |
---|
| 976 | if eta is None: eta = -1.0 |
---|
[876] | 977 | s = scantable(self._math._convertflux(self, d, eta, jyperk)) |
---|
| 978 | s._add_history("convert_flux", varlist) |
---|
| 979 | print_log() |
---|
| 980 | if insitu: self._assign(s) |
---|
| 981 | else: return s |
---|
[513] | 982 | |
---|
[876] | 983 | def gain_el(self, poly=None, filename="", method="linear", insitu=None): |
---|
[513] | 984 | """ |
---|
| 985 | Return a scan after applying a gain-elevation correction. |
---|
| 986 | The correction can be made via either a polynomial or a |
---|
| 987 | table-based interpolation (and extrapolation if necessary). |
---|
| 988 | You specify polynomial coefficients, an ascii table or neither. |
---|
| 989 | If you specify neither, then a polynomial correction will be made |
---|
| 990 | with built in coefficients known for certain telescopes (an error |
---|
| 991 | will occur if the instrument is not known). |
---|
| 992 | The data and Tsys are *divided* by the scaling factors. |
---|
| 993 | Parameters: |
---|
| 994 | poly: Polynomial coefficients (default None) to compute a |
---|
| 995 | gain-elevation correction as a function of |
---|
| 996 | elevation (in degrees). |
---|
| 997 | filename: The name of an ascii file holding correction factors. |
---|
| 998 | The first row of the ascii file must give the column |
---|
| 999 | names and these MUST include columns |
---|
| 1000 | "ELEVATION" (degrees) and "FACTOR" (multiply data |
---|
| 1001 | by this) somewhere. |
---|
| 1002 | The second row must give the data type of the |
---|
| 1003 | column. Use 'R' for Real and 'I' for Integer. |
---|
| 1004 | An example file would be |
---|
| 1005 | (actual factors are arbitrary) : |
---|
| 1006 | |
---|
| 1007 | TIME ELEVATION FACTOR |
---|
| 1008 | R R R |
---|
| 1009 | 0.1 0 0.8 |
---|
| 1010 | 0.2 20 0.85 |
---|
| 1011 | 0.3 40 0.9 |
---|
| 1012 | 0.4 60 0.85 |
---|
| 1013 | 0.5 80 0.8 |
---|
| 1014 | 0.6 90 0.75 |
---|
| 1015 | method: Interpolation method when correcting from a table. |
---|
| 1016 | Values are "nearest", "linear" (default), "cubic" |
---|
| 1017 | and "spline" |
---|
| 1018 | insitu: if False a new scantable is returned. |
---|
| 1019 | Otherwise, the scaling is done in-situ |
---|
| 1020 | The default is taken from .asaprc (False) |
---|
| 1021 | """ |
---|
| 1022 | |
---|
| 1023 | if insitu is None: insitu = rcParams['insitu'] |
---|
[876] | 1024 | self._math._setinsitu(insitu) |
---|
[513] | 1025 | varlist = vars() |
---|
| 1026 | if poly is None: |
---|
[1118] | 1027 | poly = () |
---|
[513] | 1028 | from os.path import expandvars |
---|
| 1029 | filename = expandvars(filename) |
---|
[876] | 1030 | s = scantable(self._math._gainel(self, poly, filename, method)) |
---|
| 1031 | s._add_history("gain_el", varlist) |
---|
| 1032 | print_log() |
---|
| 1033 | if insitu: self._assign(s) |
---|
| 1034 | else: return s |
---|
[710] | 1035 | |
---|
[931] | 1036 | def freq_align(self, reftime=None, method='cubic', insitu=None): |
---|
[513] | 1037 | """ |
---|
| 1038 | Return a scan where all rows have been aligned in frequency/velocity. |
---|
| 1039 | The alignment frequency frame (e.g. LSRK) is that set by function |
---|
| 1040 | set_freqframe. |
---|
| 1041 | Parameters: |
---|
| 1042 | reftime: reference time to align at. By default, the time of |
---|
| 1043 | the first row of data is used. |
---|
| 1044 | method: Interpolation method for regridding the spectra. |
---|
| 1045 | Choose from "nearest", "linear", "cubic" (default) |
---|
| 1046 | and "spline" |
---|
| 1047 | insitu: if False a new scantable is returned. |
---|
| 1048 | Otherwise, the scaling is done in-situ |
---|
| 1049 | The default is taken from .asaprc (False) |
---|
| 1050 | """ |
---|
[931] | 1051 | if insitu is None: insitu = rcParams["insitu"] |
---|
[876] | 1052 | self._math._setinsitu(insitu) |
---|
[513] | 1053 | varlist = vars() |
---|
[931] | 1054 | if reftime is None: reftime = "" |
---|
| 1055 | s = scantable(self._math._freq_align(self, reftime, method)) |
---|
[876] | 1056 | s._add_history("freq_align", varlist) |
---|
| 1057 | print_log() |
---|
| 1058 | if insitu: self._assign(s) |
---|
| 1059 | else: return s |
---|
[513] | 1060 | |
---|
[876] | 1061 | def opacity(self, tau, insitu=None): |
---|
[513] | 1062 | """ |
---|
| 1063 | Apply an opacity correction. The data |
---|
| 1064 | and Tsys are multiplied by the correction factor. |
---|
| 1065 | Parameters: |
---|
| 1066 | tau: Opacity from which the correction factor is |
---|
| 1067 | exp(tau*ZD) |
---|
| 1068 | where ZD is the zenith-distance |
---|
| 1069 | insitu: if False a new scantable is returned. |
---|
| 1070 | Otherwise, the scaling is done in-situ |
---|
| 1071 | The default is taken from .asaprc (False) |
---|
| 1072 | """ |
---|
| 1073 | if insitu is None: insitu = rcParams['insitu'] |
---|
[876] | 1074 | self._math._setinsitu(insitu) |
---|
[513] | 1075 | varlist = vars() |
---|
[876] | 1076 | s = scantable(self._math._opacity(self, tau)) |
---|
| 1077 | s._add_history("opacity", varlist) |
---|
| 1078 | print_log() |
---|
| 1079 | if insitu: self._assign(s) |
---|
| 1080 | else: return s |
---|
[513] | 1081 | |
---|
| 1082 | def bin(self, width=5, insitu=None): |
---|
| 1083 | """ |
---|
| 1084 | Return a scan where all spectra have been binned up. |
---|
[1348] | 1085 | Parameters: |
---|
[513] | 1086 | width: The bin width (default=5) in pixels |
---|
| 1087 | insitu: if False a new scantable is returned. |
---|
| 1088 | Otherwise, the scaling is done in-situ |
---|
| 1089 | The default is taken from .asaprc (False) |
---|
| 1090 | """ |
---|
| 1091 | if insitu is None: insitu = rcParams['insitu'] |
---|
[876] | 1092 | self._math._setinsitu(insitu) |
---|
[513] | 1093 | varlist = vars() |
---|
[876] | 1094 | s = scantable(self._math._bin(self, width)) |
---|
[1118] | 1095 | s._add_history("bin", varlist) |
---|
[876] | 1096 | print_log() |
---|
| 1097 | if insitu: self._assign(s) |
---|
| 1098 | else: return s |
---|
[513] | 1099 | |
---|
[710] | 1100 | |
---|
[513] | 1101 | def resample(self, width=5, method='cubic', insitu=None): |
---|
| 1102 | """ |
---|
[1348] | 1103 | Return a scan where all spectra have been binned up. |
---|
| 1104 | |
---|
| 1105 | Parameters: |
---|
[513] | 1106 | width: The bin width (default=5) in pixels |
---|
| 1107 | method: Interpolation method when correcting from a table. |
---|
| 1108 | Values are "nearest", "linear", "cubic" (default) |
---|
| 1109 | and "spline" |
---|
| 1110 | insitu: if False a new scantable is returned. |
---|
| 1111 | Otherwise, the scaling is done in-situ |
---|
| 1112 | The default is taken from .asaprc (False) |
---|
| 1113 | """ |
---|
| 1114 | if insitu is None: insitu = rcParams['insitu'] |
---|
[876] | 1115 | self._math._setinsitu(insitu) |
---|
[513] | 1116 | varlist = vars() |
---|
[876] | 1117 | s = scantable(self._math._resample(self, method, width)) |
---|
[1118] | 1118 | s._add_history("resample", varlist) |
---|
[876] | 1119 | print_log() |
---|
| 1120 | if insitu: self._assign(s) |
---|
| 1121 | else: return s |
---|
[513] | 1122 | |
---|
| 1123 | |
---|
[946] | 1124 | def average_pol(self, mask=None, weight='none'): |
---|
| 1125 | """ |
---|
| 1126 | Average the Polarisations together. |
---|
| 1127 | Parameters: |
---|
| 1128 | mask: An optional mask defining the region, where the |
---|
| 1129 | averaging will be applied. The output will have all |
---|
| 1130 | specified points masked. |
---|
| 1131 | weight: Weighting scheme. 'none' (default), 'var' (1/var(spec) |
---|
| 1132 | weighted), or 'tsys' (1/Tsys**2 weighted) |
---|
| 1133 | """ |
---|
| 1134 | varlist = vars() |
---|
| 1135 | if mask is None: |
---|
| 1136 | mask = () |
---|
[1010] | 1137 | s = scantable(self._math._averagepol(self, mask, weight.upper())) |
---|
[1118] | 1138 | s._add_history("average_pol", varlist) |
---|
[946] | 1139 | print_log() |
---|
[992] | 1140 | return s |
---|
[513] | 1141 | |
---|
[1145] | 1142 | def average_beam(self, mask=None, weight='none'): |
---|
| 1143 | """ |
---|
| 1144 | Average the Beams together. |
---|
| 1145 | Parameters: |
---|
| 1146 | mask: An optional mask defining the region, where the |
---|
| 1147 | averaging will be applied. The output will have all |
---|
| 1148 | specified points masked. |
---|
| 1149 | weight: Weighting scheme. 'none' (default), 'var' (1/var(spec) |
---|
| 1150 | weighted), or 'tsys' (1/Tsys**2 weighted) |
---|
| 1151 | """ |
---|
| 1152 | varlist = vars() |
---|
| 1153 | if mask is None: |
---|
| 1154 | mask = () |
---|
| 1155 | s = scantable(self._math._averagebeams(self, mask, weight.upper())) |
---|
| 1156 | s._add_history("average_beam", varlist) |
---|
| 1157 | print_log() |
---|
| 1158 | return s |
---|
| 1159 | |
---|
[992] | 1160 | def convert_pol(self, poltype=None): |
---|
| 1161 | """ |
---|
| 1162 | Convert the data to a different polarisation type. |
---|
| 1163 | Parameters: |
---|
| 1164 | poltype: The new polarisation type. Valid types are: |
---|
| 1165 | "linear", "stokes" and "circular" |
---|
| 1166 | """ |
---|
| 1167 | varlist = vars() |
---|
| 1168 | try: |
---|
| 1169 | s = scantable(self._math._convertpol(self, poltype)) |
---|
[1118] | 1170 | except RuntimeError, msg: |
---|
[992] | 1171 | if rcParams['verbose']: |
---|
[1118] | 1172 | print msg |
---|
| 1173 | return |
---|
[992] | 1174 | else: |
---|
| 1175 | raise |
---|
[1118] | 1176 | s._add_history("convert_pol", varlist) |
---|
[992] | 1177 | print_log() |
---|
| 1178 | return s |
---|
| 1179 | |
---|
[876] | 1180 | def smooth(self, kernel="hanning", width=5.0, insitu=None): |
---|
[513] | 1181 | """ |
---|
| 1182 | Smooth the spectrum by the specified kernel (conserving flux). |
---|
| 1183 | Parameters: |
---|
| 1184 | kernel: The type of smoothing kernel. Select from |
---|
| 1185 | 'hanning' (default), 'gaussian' and 'boxcar'. |
---|
| 1186 | The first three characters are sufficient. |
---|
| 1187 | width: The width of the kernel in pixels. For hanning this is |
---|
| 1188 | ignored otherwise it defauls to 5 pixels. |
---|
| 1189 | For 'gaussian' it is the Full Width Half |
---|
| 1190 | Maximum. For 'boxcar' it is the full width. |
---|
| 1191 | insitu: if False a new scantable is returned. |
---|
| 1192 | Otherwise, the scaling is done in-situ |
---|
| 1193 | The default is taken from .asaprc (False) |
---|
| 1194 | Example: |
---|
| 1195 | none |
---|
| 1196 | """ |
---|
| 1197 | if insitu is None: insitu = rcParams['insitu'] |
---|
[876] | 1198 | self._math._setinsitu(insitu) |
---|
[513] | 1199 | varlist = vars() |
---|
[1118] | 1200 | s = scantable(self._math._smooth(self, kernel.lower(), width)) |
---|
[876] | 1201 | s._add_history("smooth", varlist) |
---|
| 1202 | print_log() |
---|
| 1203 | if insitu: self._assign(s) |
---|
| 1204 | else: return s |
---|
[513] | 1205 | |
---|
[876] | 1206 | |
---|
[1061] | 1207 | def poly_baseline(self, mask=None, order=0, plot=False, insitu=None): |
---|
[513] | 1208 | """ |
---|
| 1209 | Return a scan which has been baselined (all rows) by a polynomial. |
---|
| 1210 | Parameters: |
---|
[794] | 1211 | mask: an optional mask |
---|
| 1212 | order: the order of the polynomial (default is 0) |
---|
[1061] | 1213 | plot: plot the fit and the residual. In this each |
---|
| 1214 | indivual fit has to be approved, by typing 'y' |
---|
| 1215 | or 'n' |
---|
[794] | 1216 | insitu: if False a new scantable is returned. |
---|
| 1217 | Otherwise, the scaling is done in-situ |
---|
| 1218 | The default is taken from .asaprc (False) |
---|
[513] | 1219 | Example: |
---|
| 1220 | # return a scan baselined by a third order polynomial, |
---|
| 1221 | # not using a mask |
---|
| 1222 | bscan = scan.poly_baseline(order=3) |
---|
[579] | 1223 | """ |
---|
[513] | 1224 | if insitu is None: insitu = rcParams['insitu'] |
---|
| 1225 | varlist = vars() |
---|
| 1226 | if mask is None: |
---|
[1295] | 1227 | mask = [True for i in xrange(self.nchan(-1))] |
---|
[513] | 1228 | from asap.asapfitter import fitter |
---|
[1217] | 1229 | try: |
---|
| 1230 | f = fitter() |
---|
| 1231 | f.set_scan(self, mask) |
---|
| 1232 | f.set_function(poly=order) |
---|
| 1233 | s = f.auto_fit(insitu, plot=plot) |
---|
| 1234 | s._add_history("poly_baseline", varlist) |
---|
| 1235 | print_log() |
---|
| 1236 | if insitu: self._assign(s) |
---|
| 1237 | else: return s |
---|
| 1238 | except RuntimeError: |
---|
| 1239 | msg = "The fit failed, possibly because it didn't converge." |
---|
| 1240 | if rcParams['verbose']: |
---|
| 1241 | print msg |
---|
| 1242 | return |
---|
| 1243 | else: |
---|
| 1244 | raise RuntimeError(msg) |
---|
[513] | 1245 | |
---|
[1217] | 1246 | |
---|
[1118] | 1247 | def auto_poly_baseline(self, mask=[], edge=(0, 0), order=0, |
---|
[1280] | 1248 | threshold=3, chan_avg_limit=1, plot=False, |
---|
| 1249 | insitu=None): |
---|
[880] | 1250 | """ |
---|
| 1251 | Return a scan which has been baselined (all rows) by a polynomial. |
---|
| 1252 | Spectral lines are detected first using linefinder and masked out |
---|
| 1253 | to avoid them affecting the baseline solution. |
---|
| 1254 | |
---|
| 1255 | Parameters: |
---|
| 1256 | mask: an optional mask retreived from scantable |
---|
| 1257 | edge: an optional number of channel to drop at |
---|
| 1258 | the edge of spectrum. If only one value is |
---|
| 1259 | specified, the same number will be dropped from |
---|
| 1260 | both sides of the spectrum. Default is to keep |
---|
[907] | 1261 | all channels. Nested tuples represent individual |
---|
[976] | 1262 | edge selection for different IFs (a number of spectral |
---|
| 1263 | channels can be different) |
---|
[880] | 1264 | order: the order of the polynomial (default is 0) |
---|
| 1265 | threshold: the threshold used by line finder. It is better to |
---|
| 1266 | keep it large as only strong lines affect the |
---|
| 1267 | baseline solution. |
---|
[1280] | 1268 | chan_avg_limit: |
---|
| 1269 | a maximum number of consequtive spectral channels to |
---|
| 1270 | average during the search of weak and broad lines. |
---|
| 1271 | The default is no averaging (and no search for weak |
---|
| 1272 | lines). If such lines can affect the fitted baseline |
---|
| 1273 | (e.g. a high order polynomial is fitted), increase this |
---|
| 1274 | parameter (usually values up to 8 are reasonable). Most |
---|
| 1275 | users of this method should find the default value |
---|
| 1276 | sufficient. |
---|
[1061] | 1277 | plot: plot the fit and the residual. In this each |
---|
| 1278 | indivual fit has to be approved, by typing 'y' |
---|
| 1279 | or 'n' |
---|
[880] | 1280 | insitu: if False a new scantable is returned. |
---|
| 1281 | Otherwise, the scaling is done in-situ |
---|
| 1282 | The default is taken from .asaprc (False) |
---|
| 1283 | |
---|
| 1284 | Example: |
---|
| 1285 | scan2=scan.auto_poly_baseline(order=7) |
---|
| 1286 | """ |
---|
| 1287 | if insitu is None: insitu = rcParams['insitu'] |
---|
| 1288 | varlist = vars() |
---|
| 1289 | from asap.asapfitter import fitter |
---|
| 1290 | from asap.asaplinefind import linefinder |
---|
| 1291 | from asap import _is_sequence_or_number as _is_valid |
---|
| 1292 | |
---|
[976] | 1293 | # check whether edge is set up for each IF individually |
---|
[1118] | 1294 | individualedge = False; |
---|
| 1295 | if len(edge) > 1: |
---|
| 1296 | if isinstance(edge[0], list) or isinstance(edge[0], tuple): |
---|
| 1297 | individualedge = True; |
---|
[907] | 1298 | |
---|
[1118] | 1299 | if not _is_valid(edge, int) and not individualedge: |
---|
[909] | 1300 | raise ValueError, "Parameter 'edge' has to be an integer or a \ |
---|
[907] | 1301 | pair of integers specified as a tuple. Nested tuples are allowed \ |
---|
| 1302 | to make individual selection for different IFs." |
---|
[919] | 1303 | |
---|
[1118] | 1304 | curedge = (0, 0) |
---|
| 1305 | if individualedge: |
---|
| 1306 | for edgepar in edge: |
---|
| 1307 | if not _is_valid(edgepar, int): |
---|
| 1308 | raise ValueError, "Each element of the 'edge' tuple has \ |
---|
| 1309 | to be a pair of integers or an integer." |
---|
[907] | 1310 | else: |
---|
[1118] | 1311 | curedge = edge; |
---|
[880] | 1312 | |
---|
| 1313 | # setup fitter |
---|
| 1314 | f = fitter() |
---|
| 1315 | f.set_function(poly=order) |
---|
| 1316 | |
---|
| 1317 | # setup line finder |
---|
[1118] | 1318 | fl = linefinder() |
---|
[1268] | 1319 | fl.set_options(threshold=threshold,avg_limit=chan_avg_limit) |
---|
[880] | 1320 | |
---|
| 1321 | if not insitu: |
---|
[1118] | 1322 | workscan = self.copy() |
---|
[880] | 1323 | else: |
---|
[1118] | 1324 | workscan = self |
---|
[880] | 1325 | |
---|
[907] | 1326 | fl.set_scan(workscan) |
---|
| 1327 | |
---|
[1118] | 1328 | rows = range(workscan.nrow()) |
---|
[880] | 1329 | asaplog.push("Processing:") |
---|
| 1330 | for r in rows: |
---|
[1118] | 1331 | msg = " Scan[%d] Beam[%d] IF[%d] Pol[%d] Cycle[%d]" % \ |
---|
| 1332 | (workscan.getscan(r), workscan.getbeam(r), workscan.getif(r), \ |
---|
| 1333 | workscan.getpol(r), workscan.getcycle(r)) |
---|
[880] | 1334 | asaplog.push(msg, False) |
---|
[907] | 1335 | |
---|
[976] | 1336 | # figure out edge parameter |
---|
[1118] | 1337 | if individualedge: |
---|
| 1338 | if len(edge) >= workscan.getif(r): |
---|
| 1339 | raise RuntimeError, "Number of edge elements appear to " \ |
---|
| 1340 | "be less than the number of IFs" |
---|
| 1341 | curedge = edge[workscan.getif(r)] |
---|
[919] | 1342 | |
---|
[976] | 1343 | # setup line finder |
---|
[1118] | 1344 | fl.find_lines(r, mask, curedge) |
---|
[880] | 1345 | f.set_scan(workscan, fl.get_mask()) |
---|
| 1346 | f.x = workscan._getabcissa(r) |
---|
| 1347 | f.y = workscan._getspectrum(r) |
---|
| 1348 | f.data = None |
---|
| 1349 | f.fit() |
---|
| 1350 | x = f.get_parameters() |
---|
[1061] | 1351 | if plot: |
---|
| 1352 | f.plot(residual=True) |
---|
| 1353 | x = raw_input("Accept fit ( [y]/n ): ") |
---|
| 1354 | if x.upper() == 'N': |
---|
| 1355 | continue |
---|
[880] | 1356 | workscan._setspectrum(f.fitter.getresidual(), r) |
---|
[1061] | 1357 | if plot: |
---|
| 1358 | f._p.unmap() |
---|
| 1359 | f._p = None |
---|
| 1360 | workscan._add_history("auto_poly_baseline", varlist) |
---|
[880] | 1361 | if insitu: |
---|
| 1362 | self._assign(workscan) |
---|
| 1363 | else: |
---|
| 1364 | return workscan |
---|
| 1365 | |
---|
[914] | 1366 | def rotate_linpolphase(self, angle): |
---|
| 1367 | """ |
---|
| 1368 | Rotate the phase of the complex polarization O=Q+iU correlation. |
---|
| 1369 | This is always done in situ in the raw data. So if you call this |
---|
| 1370 | function more than once then each call rotates the phase further. |
---|
| 1371 | Parameters: |
---|
| 1372 | angle: The angle (degrees) to rotate (add) by. |
---|
| 1373 | Examples: |
---|
| 1374 | scan.rotate_linpolphase(2.3) |
---|
| 1375 | """ |
---|
| 1376 | varlist = vars() |
---|
[936] | 1377 | self._math._rotate_linpolphase(self, angle) |
---|
[914] | 1378 | self._add_history("rotate_linpolphase", varlist) |
---|
| 1379 | print_log() |
---|
| 1380 | return |
---|
[710] | 1381 | |
---|
[513] | 1382 | |
---|
[914] | 1383 | def rotate_xyphase(self, angle): |
---|
| 1384 | """ |
---|
| 1385 | Rotate the phase of the XY correlation. This is always done in situ |
---|
| 1386 | in the data. So if you call this function more than once |
---|
| 1387 | then each call rotates the phase further. |
---|
| 1388 | Parameters: |
---|
| 1389 | angle: The angle (degrees) to rotate (add) by. |
---|
| 1390 | Examples: |
---|
| 1391 | scan.rotate_xyphase(2.3) |
---|
| 1392 | """ |
---|
| 1393 | varlist = vars() |
---|
[936] | 1394 | self._math._rotate_xyphase(self, angle) |
---|
[914] | 1395 | self._add_history("rotate_xyphase", varlist) |
---|
| 1396 | print_log() |
---|
| 1397 | return |
---|
| 1398 | |
---|
| 1399 | def swap_linears(self): |
---|
| 1400 | """ |
---|
[1348] | 1401 | Swap the linear polarisations XX and YY, or better the first two |
---|
| 1402 | polarisations as this also works for ciculars. |
---|
[914] | 1403 | """ |
---|
| 1404 | varlist = vars() |
---|
[936] | 1405 | self._math._swap_linears(self) |
---|
[914] | 1406 | self._add_history("swap_linears", varlist) |
---|
| 1407 | print_log() |
---|
| 1408 | return |
---|
| 1409 | |
---|
| 1410 | def invert_phase(self): |
---|
| 1411 | """ |
---|
| 1412 | Invert the phase of the complex polarisation |
---|
| 1413 | """ |
---|
| 1414 | varlist = vars() |
---|
[936] | 1415 | self._math._invert_phase(self) |
---|
[914] | 1416 | self._add_history("invert_phase", varlist) |
---|
| 1417 | print_log() |
---|
| 1418 | return |
---|
| 1419 | |
---|
[876] | 1420 | def add(self, offset, insitu=None): |
---|
[513] | 1421 | """ |
---|
| 1422 | Return a scan where all spectra have the offset added |
---|
| 1423 | Parameters: |
---|
| 1424 | offset: the offset |
---|
| 1425 | insitu: if False a new scantable is returned. |
---|
| 1426 | Otherwise, the scaling is done in-situ |
---|
| 1427 | The default is taken from .asaprc (False) |
---|
| 1428 | """ |
---|
| 1429 | if insitu is None: insitu = rcParams['insitu'] |
---|
[876] | 1430 | self._math._setinsitu(insitu) |
---|
[513] | 1431 | varlist = vars() |
---|
[876] | 1432 | s = scantable(self._math._unaryop(self, offset, "ADD", False)) |
---|
[1118] | 1433 | s._add_history("add", varlist) |
---|
[876] | 1434 | print_log() |
---|
| 1435 | if insitu: |
---|
| 1436 | self._assign(s) |
---|
| 1437 | else: |
---|
[513] | 1438 | return s |
---|
| 1439 | |
---|
[1308] | 1440 | def scale(self, factor, tsys=True, insitu=None): |
---|
[513] | 1441 | """ |
---|
| 1442 | Return a scan where all spectra are scaled by the give 'factor' |
---|
| 1443 | Parameters: |
---|
| 1444 | factor: the scaling factor |
---|
| 1445 | insitu: if False a new scantable is returned. |
---|
| 1446 | Otherwise, the scaling is done in-situ |
---|
| 1447 | The default is taken from .asaprc (False) |
---|
| 1448 | tsys: if True (default) then apply the operation to Tsys |
---|
| 1449 | as well as the data |
---|
| 1450 | """ |
---|
| 1451 | if insitu is None: insitu = rcParams['insitu'] |
---|
[876] | 1452 | self._math._setinsitu(insitu) |
---|
[513] | 1453 | varlist = vars() |
---|
[876] | 1454 | s = scantable(self._math._unaryop(self, factor, "MUL", tsys)) |
---|
[1118] | 1455 | s._add_history("scale", varlist) |
---|
[876] | 1456 | print_log() |
---|
| 1457 | if insitu: |
---|
| 1458 | self._assign(s) |
---|
| 1459 | else: |
---|
[513] | 1460 | return s |
---|
| 1461 | |
---|
[1348] | 1462 | def auto_quotient(self, preserve=True, mode='paired'): |
---|
[670] | 1463 | """ |
---|
| 1464 | This function allows to build quotients automatically. |
---|
| 1465 | It assumes the observation to have the same numer of |
---|
| 1466 | "ons" and "offs" |
---|
| 1467 | Parameters: |
---|
[710] | 1468 | preserve: you can preserve (default) the continuum or |
---|
| 1469 | remove it. The equations used are |
---|
[670] | 1470 | preserve: Output = Toff * (on/off) - Toff |
---|
[1070] | 1471 | remove: Output = Toff * (on/off) - Ton |
---|
[1348] | 1472 | mode: the on/off detection mode |
---|
| 1473 | 'paired' (default) |
---|
| 1474 | identifies 'off' scans by the |
---|
| 1475 | trailing '_R' (Mopra/Parkes) or |
---|
| 1476 | '_e'/'_w' (Tid) and matches |
---|
| 1477 | on/off pairs from the observing pattern |
---|
| 1478 | 'time' |
---|
| 1479 | finds the closest off in time |
---|
| 1480 | |
---|
[670] | 1481 | """ |
---|
[1348] | 1482 | modes = ["time", "paired"] |
---|
[670] | 1483 | if not mode in modes: |
---|
[876] | 1484 | msg = "please provide valid mode. Valid modes are %s" % (modes) |
---|
| 1485 | raise ValueError(msg) |
---|
| 1486 | varlist = vars() |
---|
[1348] | 1487 | s = None |
---|
| 1488 | if mode.lower() == "paired": |
---|
| 1489 | basesel = self.get_selection() |
---|
| 1490 | sel = selector() |
---|
| 1491 | self.set_selection(basesel+sel) |
---|
| 1492 | offs = self.copy() |
---|
| 1493 | sel.set_query("SRCTYPE==0") |
---|
| 1494 | self.set_selection(basesel+sel) |
---|
| 1495 | ons = self.copy() |
---|
| 1496 | s = scantable(self._math._quotient(ons, offs, preserve)) |
---|
| 1497 | self.set_selection(basesel) |
---|
| 1498 | elif mode.lower() == "time": |
---|
| 1499 | s = scantable(self._math._auto_quotient(self, mode, preserve)) |
---|
[1118] | 1500 | s._add_history("auto_quotient", varlist) |
---|
[876] | 1501 | print_log() |
---|
| 1502 | return s |
---|
[710] | 1503 | |
---|
[1145] | 1504 | def mx_quotient(self, mask = None, weight='median', preserve=True): |
---|
[1141] | 1505 | """ |
---|
[1143] | 1506 | Form a quotient using "off" beams when observing in "MX" mode. |
---|
| 1507 | Parameters: |
---|
[1145] | 1508 | mask: an optional mask to be used when weight == 'stddev' |
---|
[1143] | 1509 | weight: How to average the off beams. Default is 'median'. |
---|
[1145] | 1510 | preserve: you can preserve (default) the continuum or |
---|
| 1511 | remove it. The equations used are |
---|
| 1512 | preserve: Output = Toff * (on/off) - Toff |
---|
| 1513 | remove: Output = Toff * (on/off) - Ton |
---|
[1217] | 1514 | """ |
---|
[1143] | 1515 | if mask is None: mask = () |
---|
[1141] | 1516 | varlist = vars() |
---|
| 1517 | on = scantable(self._math._mx_extract(self, 'on')) |
---|
[1143] | 1518 | preoff = scantable(self._math._mx_extract(self, 'off')) |
---|
| 1519 | off = preoff.average_time(mask=mask, weight=weight, scanav=False) |
---|
[1217] | 1520 | from asapmath import quotient |
---|
[1145] | 1521 | q = quotient(on, off, preserve) |
---|
[1143] | 1522 | q._add_history("mx_quotient", varlist) |
---|
[1145] | 1523 | print_log() |
---|
[1217] | 1524 | return q |
---|
[513] | 1525 | |
---|
[718] | 1526 | def freq_switch(self, insitu=None): |
---|
| 1527 | """ |
---|
| 1528 | Apply frequency switching to the data. |
---|
| 1529 | Parameters: |
---|
| 1530 | insitu: if False a new scantable is returned. |
---|
| 1531 | Otherwise, the swictching is done in-situ |
---|
| 1532 | The default is taken from .asaprc (False) |
---|
| 1533 | Example: |
---|
| 1534 | none |
---|
| 1535 | """ |
---|
| 1536 | if insitu is None: insitu = rcParams['insitu'] |
---|
[876] | 1537 | self._math._setinsitu(insitu) |
---|
[718] | 1538 | varlist = vars() |
---|
[876] | 1539 | s = scantable(self._math._freqswitch(self)) |
---|
[1118] | 1540 | s._add_history("freq_switch", varlist) |
---|
[876] | 1541 | print_log() |
---|
| 1542 | if insitu: self._assign(s) |
---|
| 1543 | else: return s |
---|
[718] | 1544 | |
---|
[780] | 1545 | def recalc_azel(self): |
---|
| 1546 | """ |
---|
| 1547 | Recalculate the azimuth and elevation for each position. |
---|
| 1548 | Parameters: |
---|
| 1549 | none |
---|
| 1550 | Example: |
---|
| 1551 | """ |
---|
| 1552 | varlist = vars() |
---|
[876] | 1553 | self._recalcazel() |
---|
[780] | 1554 | self._add_history("recalc_azel", varlist) |
---|
| 1555 | print_log() |
---|
| 1556 | return |
---|
| 1557 | |
---|
[513] | 1558 | def __add__(self, other): |
---|
| 1559 | varlist = vars() |
---|
| 1560 | s = None |
---|
| 1561 | if isinstance(other, scantable): |
---|
[1308] | 1562 | s = scantable(self._math._binaryop(self, other, "ADD")) |
---|
[513] | 1563 | elif isinstance(other, float): |
---|
[876] | 1564 | s = scantable(self._math._unaryop(self, other, "ADD", False)) |
---|
[513] | 1565 | else: |
---|
[718] | 1566 | raise TypeError("Other input is not a scantable or float value") |
---|
[513] | 1567 | s._add_history("operator +", varlist) |
---|
[718] | 1568 | print_log() |
---|
[513] | 1569 | return s |
---|
| 1570 | |
---|
| 1571 | def __sub__(self, other): |
---|
| 1572 | """ |
---|
| 1573 | implicit on all axes and on Tsys |
---|
| 1574 | """ |
---|
| 1575 | varlist = vars() |
---|
| 1576 | s = None |
---|
| 1577 | if isinstance(other, scantable): |
---|
[1308] | 1578 | s = scantable(self._math._binaryop(self, other, "SUB")) |
---|
[513] | 1579 | elif isinstance(other, float): |
---|
[876] | 1580 | s = scantable(self._math._unaryop(self, other, "SUB", False)) |
---|
[513] | 1581 | else: |
---|
[718] | 1582 | raise TypeError("Other input is not a scantable or float value") |
---|
[513] | 1583 | s._add_history("operator -", varlist) |
---|
[718] | 1584 | print_log() |
---|
[513] | 1585 | return s |
---|
[710] | 1586 | |
---|
[513] | 1587 | def __mul__(self, other): |
---|
| 1588 | """ |
---|
| 1589 | implicit on all axes and on Tsys |
---|
| 1590 | """ |
---|
| 1591 | varlist = vars() |
---|
| 1592 | s = None |
---|
| 1593 | if isinstance(other, scantable): |
---|
[1308] | 1594 | s = scantable(self._math._binaryop(self, other, "MUL")) |
---|
[513] | 1595 | elif isinstance(other, float): |
---|
[876] | 1596 | s = scantable(self._math._unaryop(self, other, "MUL", False)) |
---|
[513] | 1597 | else: |
---|
[718] | 1598 | raise TypeError("Other input is not a scantable or float value") |
---|
[513] | 1599 | s._add_history("operator *", varlist) |
---|
[718] | 1600 | print_log() |
---|
[513] | 1601 | return s |
---|
| 1602 | |
---|
[710] | 1603 | |
---|
[513] | 1604 | def __div__(self, other): |
---|
| 1605 | """ |
---|
| 1606 | implicit on all axes and on Tsys |
---|
| 1607 | """ |
---|
| 1608 | varlist = vars() |
---|
| 1609 | s = None |
---|
| 1610 | if isinstance(other, scantable): |
---|
[1308] | 1611 | s = scantable(self._math._binaryop(self, other, "DIV")) |
---|
[513] | 1612 | elif isinstance(other, float): |
---|
| 1613 | if other == 0.0: |
---|
[718] | 1614 | raise ZeroDivisionError("Dividing by zero is not recommended") |
---|
[876] | 1615 | s = scantable(self._math._unaryop(self, other, "DIV", False)) |
---|
[513] | 1616 | else: |
---|
[718] | 1617 | raise TypeError("Other input is not a scantable or float value") |
---|
[513] | 1618 | s._add_history("operator /", varlist) |
---|
[718] | 1619 | print_log() |
---|
[513] | 1620 | return s |
---|
| 1621 | |
---|
[530] | 1622 | def get_fit(self, row=0): |
---|
| 1623 | """ |
---|
| 1624 | Print or return the stored fits for a row in the scantable |
---|
| 1625 | Parameters: |
---|
| 1626 | row: the row which the fit has been applied to. |
---|
| 1627 | """ |
---|
| 1628 | if row > self.nrow(): |
---|
| 1629 | return |
---|
[976] | 1630 | from asap.asapfit import asapfit |
---|
[530] | 1631 | fit = asapfit(self._getfit(row)) |
---|
[718] | 1632 | if rcParams['verbose']: |
---|
[530] | 1633 | print fit |
---|
| 1634 | return |
---|
| 1635 | else: |
---|
| 1636 | return fit.as_dict() |
---|
| 1637 | |
---|
[484] | 1638 | def _add_history(self, funcname, parameters): |
---|
| 1639 | # create date |
---|
| 1640 | sep = "##" |
---|
| 1641 | from datetime import datetime |
---|
| 1642 | dstr = datetime.now().strftime('%Y/%m/%d %H:%M:%S') |
---|
| 1643 | hist = dstr+sep |
---|
| 1644 | hist += funcname+sep#cdate+sep |
---|
| 1645 | if parameters.has_key('self'): del parameters['self'] |
---|
[1118] | 1646 | for k, v in parameters.iteritems(): |
---|
[484] | 1647 | if type(v) is dict: |
---|
[1118] | 1648 | for k2, v2 in v.iteritems(): |
---|
[484] | 1649 | hist += k2 |
---|
| 1650 | hist += "=" |
---|
[1118] | 1651 | if isinstance(v2, scantable): |
---|
[484] | 1652 | hist += 'scantable' |
---|
| 1653 | elif k2 == 'mask': |
---|
[1118] | 1654 | if isinstance(v2, list) or isinstance(v2, tuple): |
---|
[513] | 1655 | hist += str(self._zip_mask(v2)) |
---|
| 1656 | else: |
---|
| 1657 | hist += str(v2) |
---|
[484] | 1658 | else: |
---|
[513] | 1659 | hist += str(v2) |
---|
[484] | 1660 | else: |
---|
| 1661 | hist += k |
---|
| 1662 | hist += "=" |
---|
[1118] | 1663 | if isinstance(v, scantable): |
---|
[484] | 1664 | hist += 'scantable' |
---|
| 1665 | elif k == 'mask': |
---|
[1118] | 1666 | if isinstance(v, list) or isinstance(v, tuple): |
---|
[513] | 1667 | hist += str(self._zip_mask(v)) |
---|
| 1668 | else: |
---|
| 1669 | hist += str(v) |
---|
[484] | 1670 | else: |
---|
| 1671 | hist += str(v) |
---|
| 1672 | hist += sep |
---|
| 1673 | hist = hist[:-2] # remove trailing '##' |
---|
| 1674 | self._addhistory(hist) |
---|
| 1675 | |
---|
[710] | 1676 | |
---|
[484] | 1677 | def _zip_mask(self, mask): |
---|
| 1678 | mask = list(mask) |
---|
| 1679 | i = 0 |
---|
| 1680 | segments = [] |
---|
| 1681 | while mask[i:].count(1): |
---|
| 1682 | i += mask[i:].index(1) |
---|
| 1683 | if mask[i:].count(0): |
---|
| 1684 | j = i + mask[i:].index(0) |
---|
| 1685 | else: |
---|
[710] | 1686 | j = len(mask) |
---|
[1118] | 1687 | segments.append([i, j]) |
---|
[710] | 1688 | i = j |
---|
[484] | 1689 | return segments |
---|
[714] | 1690 | |
---|
[626] | 1691 | def _get_ordinate_label(self): |
---|
| 1692 | fu = "("+self.get_fluxunit()+")" |
---|
| 1693 | import re |
---|
| 1694 | lbl = "Intensity" |
---|
[1118] | 1695 | if re.match(".K.", fu): |
---|
[626] | 1696 | lbl = "Brightness Temperature "+ fu |
---|
[1118] | 1697 | elif re.match(".Jy.", fu): |
---|
[626] | 1698 | lbl = "Flux density "+ fu |
---|
| 1699 | return lbl |
---|
[710] | 1700 | |
---|
[876] | 1701 | def _check_ifs(self): |
---|
| 1702 | nchans = [self.nchan(i) for i in range(self.nif(-1))] |
---|
[889] | 1703 | nchans = filter(lambda t: t > 0, nchans) |
---|
[876] | 1704 | return (sum(nchans)/len(nchans) == nchans[0]) |
---|
[976] | 1705 | |
---|
| 1706 | def _fill(self, names, unit, average): |
---|
| 1707 | import os |
---|
| 1708 | from asap._asap import stfiller |
---|
| 1709 | first = True |
---|
| 1710 | fullnames = [] |
---|
| 1711 | for name in names: |
---|
| 1712 | name = os.path.expandvars(name) |
---|
| 1713 | name = os.path.expanduser(name) |
---|
| 1714 | if not os.path.exists(name): |
---|
| 1715 | msg = "File '%s' does not exists" % (name) |
---|
| 1716 | if rcParams['verbose']: |
---|
| 1717 | asaplog.push(msg) |
---|
| 1718 | print asaplog.pop().strip() |
---|
| 1719 | return |
---|
| 1720 | raise IOError(msg) |
---|
| 1721 | fullnames.append(name) |
---|
| 1722 | if average: |
---|
| 1723 | asaplog.push('Auto averaging integrations') |
---|
[1079] | 1724 | stype = int(rcParams['scantable.storage'].lower() == 'disk') |
---|
[976] | 1725 | for name in fullnames: |
---|
[1073] | 1726 | tbl = Scantable(stype) |
---|
| 1727 | r = stfiller(tbl) |
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[976] | 1728 | msg = "Importing %s..." % (name) |
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[1118] | 1729 | asaplog.push(msg, False) |
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[976] | 1730 | print_log() |
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[1118] | 1731 | r._open(name, -1, -1) |
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[976] | 1732 | r._read() |
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[1073] | 1733 | #tbl = r._getdata() |
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[976] | 1734 | if average: |
---|
[1118] | 1735 | tbl = self._math._average((tbl, ), (), 'NONE', 'SCAN') |
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[976] | 1736 | #tbl = tbl2 |
---|
| 1737 | if not first: |
---|
| 1738 | tbl = self._math._merge([self, tbl]) |
---|
| 1739 | #tbl = tbl2 |
---|
| 1740 | Scantable.__init__(self, tbl) |
---|
| 1741 | r._close() |
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[1118] | 1742 | del r, tbl |
---|
[976] | 1743 | first = False |
---|
| 1744 | if unit is not None: |
---|
| 1745 | self.set_fluxunit(unit) |
---|
| 1746 | self.set_freqframe(rcParams['scantable.freqframe']) |
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| 1747 | |
---|