| 1 | from asap._asap import sdtable |
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| 2 | from numarray import ones |
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| 3 | import sys |
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| 4 | |
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| 5 | class scantable(sdtable): |
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| 6 | """ |
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| 7 | The ASAP container for scans |
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| 8 | """ |
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| 9 | |
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| 10 | def __init__(self, filename): |
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| 11 | """ |
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| 12 | Create a scantable from a saved one or make a reference |
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| 13 | Parameters: |
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| 14 | filename: the name of an asap table on disk, or |
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| 15 | [advanced] a refernce to an existing |
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| 16 | scantable |
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| 17 | """ |
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| 18 | self._vb = True |
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| 19 | self._p = None |
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| 20 | sdtable.__init__(self, filename) |
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| 21 | |
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| 22 | def save(self, name, format='ASAP'): |
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| 23 | """ |
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| 24 | Store the scantable on disk. This can be a asap file or SDFITS/MS2. |
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| 25 | Parameters: |
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| 26 | name: the name of the outputfile |
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| 27 | format: an optional file format. Default is ASAP. |
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| 28 | Alllowed are 'ASAP', 'SDFITS' and 'MS2' |
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| 29 | Example: |
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| 30 | scan.save('myscan.asap') |
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| 31 | scan.save('myscan.sdfits','SDFITS') |
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| 32 | """ |
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| 33 | if format == 'ASAP': |
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| 34 | self._save(name) |
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| 35 | else: |
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| 36 | from asap._asap import sdwriter as _sw |
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| 37 | w = _sw() |
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| 38 | if format == 'SDFITS': |
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| 39 | w.write(self, name) |
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| 40 | return |
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| 41 | |
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| 42 | def _verbose(self, *args): |
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| 43 | """ |
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| 44 | Set the verbose level True or False, to indicate if output |
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| 45 | should be printed as well as returned. |
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| 46 | """ |
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| 47 | if type(args[0]) is bool: |
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| 48 | self._vb = args[0] |
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| 49 | return |
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| 50 | elif len(args) == 0: |
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| 51 | return self._vb |
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| 52 | |
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| 53 | |
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| 54 | def copy(self): |
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| 55 | """ |
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| 56 | Return a copy of this scantable. |
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| 57 | Parameters: |
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| 58 | none |
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| 59 | Example: |
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| 60 | copiedscan = scan.copy() |
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| 61 | """ |
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| 62 | sd = scantable(sdtable._copy(self)) |
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| 63 | return sd |
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| 64 | |
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| 65 | def get_scan(self, scanid=None): |
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| 66 | """ |
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| 67 | Return a specific scan (by scanno) or collection of scans (by |
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| 68 | source name) in a new scantable. |
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| 69 | Parameters: |
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| 70 | scanid: a scanno or a source name |
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| 71 | Example: |
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| 72 | scan.get_scan('323p459') |
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| 73 | # gets all scans containing the source '323p459' |
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| 74 | """ |
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| 75 | if scanid is None: |
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| 76 | print "Please specify a scan no or name to retrieve from the scantable" |
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| 77 | try: |
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| 78 | if type(scanid) is str: |
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| 79 | s = sdtable._getsource(self,scanid) |
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| 80 | return scantable(s) |
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| 81 | elif type(scanid) is int: |
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| 82 | s = sdtable._getscan(self,scanid) |
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| 83 | return scantable(s) |
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| 84 | except RuntimeError: |
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| 85 | print "Couldn't find any match." |
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| 86 | |
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| 87 | def __str__(self): |
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| 88 | return sdtable.summary(self) |
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| 89 | |
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| 90 | def summary(self,filename=None): |
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| 91 | """ |
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| 92 | Print a summary of the contents of this scantable. |
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| 93 | Parameters: |
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| 94 | filename: the name of a file to write the putput to |
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| 95 | Default - no file output |
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| 96 | """ |
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| 97 | info = sdtable.summary(self) |
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| 98 | if filename is not None: |
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| 99 | data = open(filename, 'w') |
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| 100 | data.write(info) |
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| 101 | data.close() |
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| 102 | print info |
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| 103 | |
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| 104 | def set_selection(self, thebeam=0,theif=0,thepol=0): |
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| 105 | """ |
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| 106 | Set the spectrum for individual operations. |
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| 107 | Parameters: |
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| 108 | thebeam,theif,thepol: a number |
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| 109 | Example: |
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| 110 | scan.set_selection(0,0,1) |
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| 111 | pol1rms = scan.rms(all=False) # returns rms for beam=0 |
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| 112 | # if=0, pol=1 |
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| 113 | """ |
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| 114 | self.setbeam(thebeam) |
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| 115 | self.setpol(thepol) |
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| 116 | self.setif(theif) |
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| 117 | return |
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| 118 | |
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| 119 | def get_selection(self): |
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| 120 | """ |
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| 121 | Return/print a the current 'cursor' into the Beam/IF/Pol cube. |
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| 122 | Parameters: |
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| 123 | none |
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| 124 | Returns: |
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| 125 | a list of values (currentBeam,currentIF,currentPol) |
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| 126 | Example: |
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| 127 | none |
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| 128 | """ |
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| 129 | i = self.getbeam() |
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| 130 | j = self.getif() |
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| 131 | k = self.getpol() |
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| 132 | if self._vb: |
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| 133 | out = 'Beam=%d IF=%d Pol=%d '% (i,j,k) |
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| 134 | print out |
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| 135 | return i,j,k |
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| 136 | |
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| 137 | def rms(self,mask=None, all=True): |
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| 138 | """ |
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| 139 | Determine the root mean square of the current beam/if/pol |
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| 140 | Takes a 'mask' as an optional parameter to specify which |
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| 141 | channels should be excluded. |
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| 142 | Parameters: |
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| 143 | mask: an optional mask specifying where the rms |
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| 144 | should be determined. |
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| 145 | all: optional flag to show all or a selected |
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| 146 | spectrum of Beam/IF/Pol |
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| 147 | |
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| 148 | Example: |
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| 149 | scan.set_unit('channel') |
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| 150 | msk = scan.create_mask([100,200],[500,600]) |
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| 151 | scan.rms(mask=m) |
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| 152 | """ |
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| 153 | from asap._asap import rms as _rms |
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| 154 | if mask == None: |
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| 155 | mask = ones(self.nchan()) |
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| 156 | if all: |
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| 157 | out = '' |
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| 158 | tmp = [] |
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| 159 | for i in range(self.nbeam()): |
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| 160 | self.setbeam(i) |
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| 161 | for j in range(self.nif()): |
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| 162 | self.setif(j) |
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| 163 | for k in range(self.npol()): |
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| 164 | self.setpol(k) |
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| 165 | rmsval = _rms(self,mask) |
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| 166 | tmp.append(rmsval) |
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| 167 | out += 'Beam[%d], IF[%d], Pol[%d] = %3.3f\n' % (i,j,k,rmsval) |
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| 168 | if self._vb: |
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| 169 | print out |
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| 170 | return tmp |
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| 171 | |
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| 172 | else: |
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| 173 | i = self.getbeam() |
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| 174 | j = self.getif() |
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| 175 | k = self.getpol() |
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| 176 | rmsval = _rms(self,mask) |
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| 177 | out = 'Beam[%d], IF[%d], Pol[%d] = %3.3f' % (i,j,k,rmsval) |
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| 178 | if self._vb: |
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| 179 | print out |
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| 180 | return rmsval |
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| 181 | |
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| 182 | def get_tsys(self, all=True): |
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| 183 | """ |
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| 184 | Return the System temperatures. |
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| 185 | Parameters: |
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| 186 | all: optional parameter to get the Tsys values for all |
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| 187 | Beams/IFs/Pols (default) or just the one selected |
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| 188 | with scantable.set_selection() |
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| 189 | [True or False] |
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| 190 | Returns: |
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| 191 | a list of Tsys values. |
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| 192 | """ |
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| 193 | if all: |
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| 194 | tmp = [] |
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| 195 | out = '' |
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| 196 | for i in range(self.nbeam()): |
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| 197 | self.setbeam(i) |
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| 198 | for j in range(self.nif()): |
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| 199 | self.setif(j) |
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| 200 | for k in range(self.npol()): |
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| 201 | self.setpol(k) |
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| 202 | ts = self._gettsys() |
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| 203 | tmp.append(ts) |
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| 204 | out += 'TSys: Beam[%d], IF[%d], Pol[%d] = %3.3f\n' % (i,j,k,ts) |
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| 205 | if self._vb: |
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| 206 | print out |
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| 207 | return tmp |
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| 208 | else: |
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| 209 | i = self.getbeam() |
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| 210 | j = self.getif() |
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| 211 | k = self.getpol() |
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| 212 | ts = self._gettsys() |
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| 213 | out = 'TSys: Beam[%d], IF[%d], Pol[%d] = %3.3f' % (i,j,k,ts) |
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| 214 | if self._vb: |
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| 215 | print out |
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| 216 | return ts |
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| 217 | |
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| 218 | def get_time(self): |
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| 219 | """ |
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| 220 | Get a list of time stamps for the observations. |
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| 221 | Return a string for each intergration in the scantable. |
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| 222 | Parameters: |
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| 223 | none |
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| 224 | Example: |
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| 225 | none |
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| 226 | """ |
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| 227 | out = [] |
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| 228 | for i in range(self.nrow()): |
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| 229 | out.append(self._gettime(i)) |
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| 230 | return out |
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| 231 | |
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| 232 | def set_unit(self, unit='channel'): |
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| 233 | """ |
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| 234 | Set the unit for all following operations on this scantable |
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| 235 | Parameters: |
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| 236 | unit: optional unit, default is 'channel' |
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| 237 | one of '*Hz','km/s','channel', '' |
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| 238 | """ |
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| 239 | |
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| 240 | if unit in ['','pixel', 'channel']: |
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| 241 | unit = '' |
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| 242 | inf = list(self._getcoordinfo()) |
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| 243 | inf[0] = unit |
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| 244 | self._setcoordinfo(inf) |
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| 245 | if self._p: self.plot() |
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| 246 | |
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| 247 | def set_freqframe(self, frame='LSRK'): |
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| 248 | """ |
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| 249 | Set the frame type of the Spectral Axis. |
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| 250 | Parameters: |
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| 251 | frame: an optional frame type, default 'LSRK'. |
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| 252 | Examples: |
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| 253 | scan.set_freqframe('BARY') |
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| 254 | """ |
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| 255 | valid = ['REST','TOPO','LSRD','LSRK','BARY', \ |
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| 256 | 'GEO','GALACTO','LGROUP','CMB'] |
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| 257 | if frame in valid: |
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| 258 | inf = list(self._getcoordinfo()) |
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| 259 | inf[1] = frame |
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| 260 | self._setcoordinfo(inf) |
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| 261 | else: |
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| 262 | print "Please specify a valid freq type. Valid types are:\n",valid |
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| 263 | |
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| 264 | def get_unit(self): |
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| 265 | """ |
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| 266 | Get the default unit set in this scantable |
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| 267 | Parameters: |
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| 268 | Returns: |
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| 269 | A unit string |
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| 270 | """ |
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| 271 | inf = self._getcoordinfo() |
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| 272 | unit = inf[0] |
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| 273 | if unit == '': unit = 'channel' |
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| 274 | return unit |
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| 275 | |
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| 276 | def get_abscissa(self, rowno=0): |
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| 277 | """ |
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| 278 | Get the abscissa in the current coordinate setup for the currently |
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| 279 | selected Beam/IF/Pol |
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| 280 | Parameters: |
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| 281 | none |
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| 282 | Returns: |
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| 283 | The abscissa values and it's format string. |
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| 284 | """ |
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| 285 | absc = self.getabscissa(rowno) |
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| 286 | lbl = self.getabscissalabel(rowno) |
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| 287 | return absc, lbl |
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| 288 | |
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| 289 | def create_mask(self, *args, **kwargs): |
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| 290 | """ |
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| 291 | Compute and return a mask based on [min,max] windows. |
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| 292 | The specified windows are to be EXCLUDED, when the mask is |
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| 293 | applied. |
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| 294 | Parameters: |
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| 295 | [min,max],[min2,max2],... |
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| 296 | Pairs of start/end points specifying the regions |
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| 297 | to be masked |
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| 298 | invert: return an inverted mask, i.e. the regions |
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| 299 | specified are not masked (INCLUDED) |
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| 300 | Example: |
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| 301 | scan.set_unit('channel') |
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| 302 | |
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| 303 | a) |
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| 304 | msk = scan.set_mask([400,500],[800,900]) |
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| 305 | # masks the regions between 400 and 500 |
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| 306 | # and 800 and 900 in the unit 'channel' |
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| 307 | |
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| 308 | b) |
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| 309 | msk = scan.set_mask([400,500],[800,900], invert=True) |
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| 310 | # masks the regions outside 400 and 500 |
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| 311 | # and 800 and 900 in the unit 'channel' |
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| 312 | |
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| 313 | """ |
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| 314 | u = self._getcoordinfo()[0] |
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| 315 | if self._vb: |
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| 316 | if u == "": u = "channel" |
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| 317 | print "The current mask window unit is", u |
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| 318 | n = self.nchan() |
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| 319 | data = self.getabscissa() |
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| 320 | msk = ones(n) |
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| 321 | for window in args: |
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| 322 | if (len(window) != 2 or window[0] > window[1] ): |
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| 323 | print "A window needs to be defined as [min,max]" |
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| 324 | return |
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| 325 | for i in range(n): |
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| 326 | if data[i] >= window[0] and data[i] < window[1]: |
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| 327 | msk[i] = 0 |
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| 328 | if kwargs.has_key('invert'): |
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| 329 | if kwargs.get('invert'): |
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| 330 | from numarray import logical_not |
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| 331 | msk = logical_not(msk) |
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| 332 | return msk |
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| 333 | |
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| 334 | def set_restfreqs(self, freqs, unit='Hz'): |
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| 335 | """ |
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| 336 | Set the restfrequency(s) for this scantable. |
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| 337 | Parameters: |
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| 338 | freqs: one or more frequencies |
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| 339 | unit: optional 'unit', default 'Hz' |
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| 340 | Example: |
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| 341 | scan.set_restfreqs([1000000000.0]) |
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| 342 | """ |
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| 343 | if type(freqs) is float or int: |
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| 344 | freqs = (freqs) |
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| 345 | sdtable._setrestfreqs(self,freqs, unit) |
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| 346 | return |
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| 347 | |
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| 348 | def flag_spectrum(self, thebeam, theif, thepol): |
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| 349 | """ |
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| 350 | This flags a selected spectrum in the scan 'for good'. |
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| 351 | USE WITH CARE - not reversible. |
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| 352 | Use masks for non-permanent exclusion of channels. |
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| 353 | Parameters: |
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| 354 | thebeam,theif,thepol: all have to be explicitly |
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| 355 | specified |
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| 356 | Example: |
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| 357 | scan.flag_spectrum(0,0,1) |
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| 358 | flags the spectrum for Beam=0, IF=0, Pol=1 |
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| 359 | """ |
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| 360 | if (thebeam < self.nbeam() and theif < self.nif() and thepol < self.npol()): |
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| 361 | stable.setbeam(thebeam) |
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| 362 | stable.setif(theif) |
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| 363 | stable.setpol(thepol) |
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| 364 | stable._flag(self) |
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| 365 | else: |
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| 366 | print "Please specify a valid (Beam/IF/Pol)" |
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| 367 | return |
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| 368 | |
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| 369 | def plot(self, what='spectrum',col='Pol', panel=None): |
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| 370 | """ |
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| 371 | Plot the spectra contained in the scan. Alternatively you can also |
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| 372 | Plot Tsys vs Time |
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| 373 | Parameters: |
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| 374 | what: a choice of 'spectrum' (default) or 'tsys' |
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| 375 | col: which out of Beams/IFs/Pols should be colour stacked |
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| 376 | panel: set up multiple panels, currently not working. |
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| 377 | """ |
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| 378 | validcol = {'Beam':self.nbeam(),'IF':self.nif(),'Pol':self.npol()} |
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| 379 | validyax = ['spectrum','tsys'] |
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| 380 | if not self._p: |
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| 381 | from asap.asaplot import ASAPlot |
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| 382 | self._p = ASAPlot() |
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| 383 | # print "Plotting not enabled" |
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| 384 | # return |
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| 385 | npan = 1 |
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| 386 | x = None |
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| 387 | if what == 'tsys': |
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| 388 | n = self.nrow() |
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| 389 | if n < 2: |
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| 390 | print "Only one integration. Can't plot." |
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| 391 | return |
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| 392 | if panel == 'Time': |
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| 393 | npan = self.nrow() |
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| 394 | self._p.hold() |
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| 395 | self._p.clear() |
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| 396 | xlab,ylab,tlab = None,None,None |
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| 397 | vb = self._verbose |
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| 398 | self._verbose(False) |
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| 399 | sel = self.get_selection() |
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| 400 | for i in range(npan): |
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| 401 | for j in range(validcol[col]): |
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| 402 | x = None |
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| 403 | y = None |
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| 404 | m = None |
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| 405 | tlab = self._getsourcename(i) |
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| 406 | if col == 'Beam': |
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| 407 | self.setbeam(j) |
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| 408 | elif col == 'IF': |
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| 409 | self.setif(j) |
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| 410 | elif col == 'Pol': |
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| 411 | self.setpol(j) |
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| 412 | if what == 'tsys': |
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| 413 | x = range(self.nrow()) |
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| 414 | xlab = 'Time [pixel]' |
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| 415 | m = list(ones(len(x))) |
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| 416 | y = [] |
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| 417 | ylab = r'$T_{sys}$' |
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| 418 | for k in range(len(x)): |
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| 419 | y.append(self._gettsys(k)) |
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| 420 | else: |
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| 421 | x,xlab = self.get_abscissa(i) |
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| 422 | y = self.getspectrum(i) |
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| 423 | ylab = r'Flux' |
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| 424 | m = self.getmask(i) |
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| 425 | llab = col+' '+str(j) |
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| 426 | self._p.set_line(label=llab) |
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| 427 | self._p.plot(x,y,m) |
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| 428 | self._p.set_axes('xlabel',xlab) |
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| 429 | self._p.set_axes('ylabel',ylab) |
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| 430 | self._p.set_axes('title',tlab) |
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| 431 | self._p.release() |
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| 432 | self.set_selection(sel[0],sel[1],sel[2]) |
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| 433 | self._verbose(vb) |
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| 434 | return |
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