| 1 | from asap._asap import sdtable
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| 2 | from asap import rcParams
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| 3 | from numarray import ones,zeros
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| 4 | import sys
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| 5 |
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| 6 | class scantable(sdtable):
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| 7 | """
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| 8 | The ASAP container for scans
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| 9 | """
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| 10 |
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| 11 | def __init__(self, filename):
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| 12 | """
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| 13 | Create a scantable from a saved one or make a reference
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| 14 | Parameters:
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| 15 | filename: the name of an asap table on disk
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| 16 | or
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| 17 | the name of a rpfits/sdfits/ms file
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| 18 | (integrations within scans are auto averaged
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| 19 | and the whole file is read)
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| 20 | or
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| 21 | [advanced] a reference to an existing
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| 22 | scantable
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| 23 | """
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| 24 | self._vb = rcParams['verbose']
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| 25 | self._p = None
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| 26 | from os import stat as st
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| 27 | import stat
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| 28 | if isinstance(filename,sdtable):
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| 29 | sdtable.__init__(self, filename)
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| 30 | else:
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| 31 | try:
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| 32 | mode = st(filename)[stat.ST_MODE]
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| 33 | except OSError:
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| 34 | print "File not found"
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| 35 | return
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| 36 | if stat.S_ISDIR(mode):
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| 37 | # crude check if asap table
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| 38 | if stat.S_ISREG(st(filename+'/table.info')[stat.ST_MODE]):
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| 39 | sdtable.__init__(self, filename)
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| 40 | else:
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| 41 | print 'The given file is not a valid asap table'
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| 42 | return
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| 43 | else:
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| 44 | autoav = rcParams['scantable.autoaverage']
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| 45 |
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| 46 | from asap._asap import sdreader
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| 47 | r = sdreader(filename)
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| 48 | print 'Importing data...'
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| 49 | r.read([-1])
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| 50 | tbl = r.getdata()
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| 51 | if autoav:
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| 52 | from asap._asap import average
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| 53 | tmp = tuple([tbl])
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| 54 | print 'Auto averaging integrations...'
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| 55 | tbl2 = average(tmp,(),True,'none')
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| 56 | sdtable.__init__(self,tbl2)
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| 57 | del r,tbl
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| 58 | else:
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| 59 | sdtable.__init__(self,tbl)
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| 60 |
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| 61 | def save(self, name="", format=None):
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| 62 | """
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| 63 | Store the scantable on disk. This can be a asap file or SDFITS/MS2.
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| 64 | Parameters:
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| 65 | name: the name of the outputfile. For format="FITS" this
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| 66 | is the root file name (and can be empty).
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| 67 | format: an optional file format. Default is ASAP.
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| 68 | Allowed are - 'ASAP' (save as ASAP Table),
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| 69 | 'SDFITS' (save as SDFITS file)
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| 70 | 'FITS' (saves each row as a FITS Image)
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| 71 | 'ASCII' (saves as ascii text file)
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| 72 | 'MS2' (saves as an aips++
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| 73 | MeasurementSet V2)
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| 74 | Example:
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| 75 | scan.save('myscan.asap')
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| 76 | scan.save('myscan.sdfits','SDFITS')
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| 77 | """
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| 78 | if format is None: format = rcParams['scantable.save']
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| 79 | if format == 'ASAP':
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| 80 | self._save(name)
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| 81 | else:
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| 82 | from asap._asap import sdwriter as _sw
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| 83 | w = _sw(format)
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| 84 | w.write(self, name)
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| 85 | return
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| 86 |
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| 87 | def copy(self):
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| 88 | """
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| 89 | Return a copy of this scantable.
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| 90 | Parameters:
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| 91 | none
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| 92 | Example:
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| 93 | copiedscan = scan.copy()
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| 94 | """
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| 95 | sd = scantable(sdtable._copy(self))
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| 96 | return sd
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| 97 |
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| 98 | def get_scan(self, scanid=None):
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| 99 | """
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| 100 | Return a specific scan (by scanno) or collection of scans (by
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| 101 | source name) in a new scantable.
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| 102 | Parameters:
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| 103 | scanid: a scanno or a source name
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| 104 | Example:
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| 105 | scan.get_scan('323p459')
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| 106 | # gets all scans containing the source '323p459'
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| 107 | """
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| 108 | if scanid is None:
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| 109 | print "Please specify a scan no or name to retrieve from the scantable"
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| 110 | try:
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| 111 | if type(scanid) is str:
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| 112 | s = sdtable._getsource(self,scanid)
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| 113 | return scantable(s)
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| 114 | elif type(scanid) is int:
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| 115 | s = sdtable._getscan(self,scanid)
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| 116 | return scantable(s)
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| 117 | except RuntimeError:
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| 118 | print "Couldn't find any match."
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| 119 |
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| 120 | def __str__(self):
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| 121 | return sdtable.summary(self)
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| 122 |
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| 123 | def summary(self,filename=None):
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| 124 | """
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| 125 | Print a summary of the contents of this scantable.
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| 126 | Parameters:
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| 127 | filename: the name of a file to write the putput to
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| 128 | Default - no file output
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| 129 | """
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| 130 | info = sdtable.summary(self)
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| 131 | if filename is not None:
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| 132 | data = open(filename, 'w')
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| 133 | data.write(info)
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| 134 | data.close()
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| 135 | print info
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| 136 |
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| 137 | def set_selection(self, thebeam=0,theif=0,thepol=0):
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| 138 | """
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| 139 | Set the spectrum for individual operations.
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| 140 | Parameters:
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| 141 | thebeam,theif,thepol: a number
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| 142 | Example:
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| 143 | scan.set_selection(0,0,1)
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| 144 | pol1sig = scan.stats(all=False) # returns std dev for beam=0
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| 145 | # if=0, pol=1
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| 146 | """
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| 147 | self.setbeam(thebeam)
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| 148 | self.setpol(thepol)
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| 149 | self.setif(theif)
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| 150 | return
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| 151 |
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| 152 | def get_selection(self):
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| 153 | """
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| 154 | Return/print a the current 'cursor' into the Beam/IF/Pol cube.
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| 155 | Parameters:
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| 156 | none
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| 157 | Returns:
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| 158 | a list of values (currentBeam,currentIF,currentPol)
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| 159 | Example:
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| 160 | none
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| 161 | """
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| 162 | i = self.getbeam()
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| 163 | j = self.getif()
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| 164 | k = self.getpol()
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| 165 | if self._vb:
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| 166 | print "--------------------------------------------------"
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| 167 | print " Cursor selection"
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| 168 | print "--------------------------------------------------"
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| 169 | out = 'Beam=%d IF=%d Pol=%d ' % (i,j,k)
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| 170 | print out
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| 171 | return i,j,k
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| 172 |
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| 173 | def stats(self, stat='stddev', mask=None, all=None):
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| 174 | """
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| 175 | Determine the specified statistic of the current beam/if/pol
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| 176 | Takes a 'mask' as an optional parameter to specify which
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| 177 | channels should be excluded.
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| 178 | Parameters:
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| 179 | stat: 'min', 'max', 'sumsq', 'sum', 'mean'
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| 180 | 'var', 'stddev', 'avdev', 'rms', 'median'
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| 181 | mask: an optional mask specifying where the statistic
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| 182 | should be determined.
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| 183 | all: if true show all (default or .asaprc) rather
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| 184 | that the cursor selected spectrum of Beam/IF/Pol
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| 185 |
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| 186 | Example:
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| 187 | scan.set_unit('channel')
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| 188 | msk = scan.create_mask([100,200],[500,600])
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| 189 | scan.stats(stat='mean', mask=m)
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| 190 | """
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| 191 | if all is None: all = rcParams['scantable.allaxes']
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| 192 | from asap._asap import stats as _stats
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| 193 | if mask == None:
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| 194 | mask = ones(self.nchan())
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| 195 | if all:
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| 196 | out = ''
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| 197 | tmp = []
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| 198 | for l in range(self.nrow()):
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| 199 | tm = self._gettime(l)
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| 200 | out += 'Time[%s]:\n' % (tm)
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| 201 | for i in range(self.nbeam()):
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| 202 | self.setbeam(i)
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| 203 | if self.nbeam() > 1: out += ' Beam[%d] ' % (i)
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| 204 | for j in range(self.nif()):
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| 205 | self.setif(j)
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| 206 | if self.nif() > 1: out += ' IF[%d] ' % (j)
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| 207 | for k in range(self.npol()):
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| 208 | self.setpol(k)
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| 209 | if self.npol() > 1: out += ' Pol[%d] ' % (k)
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| 210 | statval = _stats(self,mask,stat,l)
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| 211 | tmp.append(statval)
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| 212 | out += '= %3.3f\n' % (statval[0])
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| 213 | out += "--------------------------------------------------\n"
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| 214 | if self._vb:
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| 215 | print "--------------------------------------------------"
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| 216 | print " ",stat
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| 217 | out += "--------------------------------------------------\n"
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| 218 | print out
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| 219 | return tmp
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| 220 |
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| 221 | else:
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| 222 | i = self.getbeam()
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| 223 | j = self.getif()
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| 224 | k = self.getpol()
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| 225 | statval = _stats(self,mask,stat,-1)
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| 226 | out = ''
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| 227 | for l in range(self.nrow()):
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| 228 | tm = self._gettime(l)
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| 229 | out += 'Time[%s]:\n' % (tm)
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| 230 | if self.nbeam() > 1: out += ' Beam[%d] ' % (i)
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| 231 | if self.nif() > 1: out += ' IF[%d] ' % (j)
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| 232 | if self.npol() > 1: out += ' Pol[%d] ' % (k)
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| 233 | out += '= %3.3f\n' % (statval[l])
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| 234 | out += "--------------------------------------------------\n"
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| 235 |
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| 236 | if self._vb:
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| 237 | print "--------------------------------------------------"
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| 238 | print " ",stat
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| 239 | print "--------------------------------------------------"
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| 240 | print out
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| 241 | return statval
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| 242 |
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| 243 | def stddev(self,mask=None, all=None):
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| 244 | """
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| 245 | Determine the standard deviation of the current beam/if/pol
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| 246 | Takes a 'mask' as an optional parameter to specify which
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| 247 | channels should be excluded.
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| 248 | Parameters:
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| 249 | mask: an optional mask specifying where the standard
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| 250 | deviation should be determined.
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| 251 | all: optional flag to show all or a cursor selected
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| 252 | spectrum of Beam/IF/Pol. Default is all or taken
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| 253 | from .asaprc
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| 254 |
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| 255 | Example:
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| 256 | scan.set_unit('channel')
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| 257 | msk = scan.create_mask([100,200],[500,600])
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| 258 | scan.stddev(mask=m)
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| 259 | """
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| 260 | if all is None: all = rcParams['scantable.allaxes']
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| 261 | return self.stats(stat='stddev',mask=mask, all=all);
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| 262 |
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| 263 | def get_tsys(self, all=None):
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| 264 | """
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| 265 | Return the System temperatures.
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| 266 | Parameters:
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| 267 | all: optional parameter to get the Tsys values for all
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| 268 | Beams/IFs/Pols (default) or just the one selected
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| 269 | with scantable.set_selection()
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| 270 | [True or False]
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| 271 | Returns:
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| 272 | a list of Tsys values.
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| 273 | """
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| 274 | if all is None: all = rcParams['scantable.allaxes']
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| 275 | if all:
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| 276 | out = ''
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| 277 | tmp = []
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| 278 | for l in range(self.nrow()):
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| 279 | tm = self._gettime(l)
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| 280 | out += 'Time[%s]:\n' % (tm)
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| 281 | for i in range(self.nbeam()):
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| 282 | self.setbeam(i)
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| 283 | if self.nbeam() > 1: out += ' Beam[%d] ' % (i)
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| 284 | for j in range(self.nif()):
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| 285 | self.setif(j)
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| 286 | if self.nif() > 1: out += ' IF[%d] ' % (j)
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| 287 | for k in range(self.npol()):
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| 288 | self.setpol(k)
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| 289 | if self.npol() > 1: out += ' Pol[%d] ' % (k)
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| 290 | ts = self._gettsys()
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| 291 | tmp.append(ts)
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| 292 | out += '= %3.3f\n' % (ts[l])
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| 293 | out+= "--------------------------------------------------\n"
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| 294 | if self._vb:
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| 295 | print "--------------------------------------------------"
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| 296 | print " Tsys"
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| 297 | print "--------------------------------------------------"
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| 298 | print out
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| 299 | return tmp
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| 300 | else:
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| 301 | i = self.getbeam()
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| 302 | j = self.getif()
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| 303 | k = self.getpol()
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| 304 | ts = self._gettsys()
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| 305 | out = ''
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| 306 | for l in range(self.nrow()):
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| 307 | tm = self._gettime(l)
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| 308 | out += 'Time[%s]:\n' % (tm)
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| 309 | if self.nbeam() > 1: out += ' Beam[%d] ' % (i)
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| 310 | if self.nif() > 1: out += ' IF[%d] ' % (j)
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| 311 | if self.npol() > 1: out += ' Pol[%d] ' % (k)
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| 312 | out += '= %3.3f\n' % (ts[l])
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| 313 | out += "--------------------------------------------------\n"
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| 314 | if self._vb:
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| 315 | print "--------------------------------------------------"
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| 316 | print " Tsys"
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| 317 | print "--------------------------------------------------"
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| 318 | print out
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| 319 | return ts
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| 320 |
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| 321 | def get_time(self):
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| 322 | """
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| 323 | Get a list of time stamps for the observations.
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| 324 | Return a string for each integration in the scantable.
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| 325 | Parameters:
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| 326 | none
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| 327 | Example:
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| 328 | none
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| 329 | """
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| 330 | out = []
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| 331 | for i in range(self.nrow()):
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| 332 | out.append(self._gettime(i))
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| 333 | return out
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| 334 |
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| 335 | def set_unit(self, unit='channel'):
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| 336 | """
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| 337 | Set the unit for all following operations on this scantable
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| 338 | Parameters:
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| 339 | unit: optional unit, default is 'channel'
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| 340 | one of '*Hz','km/s','channel', ''
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| 341 | """
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| 342 |
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| 343 | if unit in ['','pixel', 'channel']:
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| 344 | unit = ''
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| 345 | inf = list(self._getcoordinfo())
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| 346 | inf[0] = unit
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| 347 | self._setcoordinfo(inf)
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| 348 | if self._p: self.plot()
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| 349 |
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| 350 | def set_freqframe(self, frame=None):
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| 351 | """
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| 352 | Set the frame type of the Spectral Axis.
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| 353 | Parameters:
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| 354 | frame: an optional frame type, default 'LSRK'.
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| 355 | Examples:
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| 356 | scan.set_freqframe('BARY')
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| 357 | """
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| 358 | if not frame: frame = rcParams['scantable.freqframe']
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| 359 | valid = ['REST','TOPO','LSRD','LSRK','BARY', \
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| 360 | 'GEO','GALACTO','LGROUP','CMB']
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| 361 | if frame in valid:
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| 362 | inf = list(self._getcoordinfo())
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| 363 | inf[1] = frame
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| 364 | self._setcoordinfo(inf)
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| 365 | else:
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| 366 | print "Please specify a valid freq type. Valid types are:\n",valid
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| 367 |
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| 368 | def get_unit(self):
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| 369 | """
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| 370 | Get the default unit set in this scantable
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| 371 | Parameters:
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| 372 | Returns:
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| 373 | A unit string
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| 374 | """
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| 375 | inf = self._getcoordinfo()
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| 376 | unit = inf[0]
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| 377 | if unit == '': unit = 'channel'
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| 378 | return unit
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| 379 |
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| 380 | def get_abcissa(self, rowno=0):
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| 381 | """
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| 382 | Get the abcissa in the current coordinate setup for the currently
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| 383 | selected Beam/IF/Pol
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| 384 | Parameters:
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| 385 | rowno: an optional row number in the scantable. Default is the
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| 386 | first row, i.e. rowno=0
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| 387 | Returns:
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| 388 | The abcissa values and it's format string.
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| 389 | """
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| 390 | abc = self.getabcissa(rowno)
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| 391 | lbl = self.getabcissalabel(rowno)
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| 392 | return abc, lbl
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| 393 |
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| 394 | def create_mask(self, *args, **kwargs):
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| 395 | """
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| 396 | Compute and return a mask based on [min,max] windows.
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| 397 | The specified windows are to be INCLUDED, when the mask is
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| 398 | applied.
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| 399 | Parameters:
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| 400 | [min,max],[min2,max2],...
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| 401 | Pairs of start/end points specifying the regions
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| 402 | to be masked
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| 403 | invert: optional argument. If specified as True,
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| 404 | return an inverted mask, i.e. the regions
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| 405 | specified are EXCLUDED
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| 406 | Example:
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| 407 | scan.set_unit('channel')
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| 408 |
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| 409 | a)
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| 410 | msk = scan.set_mask([400,500],[800,900])
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| 411 | # masks everything outside 400 and 500
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| 412 | # and 800 and 900 in the unit 'channel'
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| 413 |
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| 414 | b)
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| 415 | msk = scan.set_mask([400,500],[800,900], invert=True)
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| 416 | # masks the regions between 400 and 500
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| 417 | # and 800 and 900 in the unit 'channel'
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| 418 |
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| 419 | """
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| 420 | u = self._getcoordinfo()[0]
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| 421 | if self._vb:
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| 422 | if u == "": u = "channel"
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| 423 | print "The current mask window unit is", u
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| 424 | n = self.nchan()
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| 425 | data = self.getabcissa()
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| 426 | msk = zeros(n)
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| 427 | for window in args:
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| 428 | if (len(window) != 2 or window[0] > window[1] ):
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| 429 | print "A window needs to be defined as [min,max]"
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| 430 | return
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| 431 | for i in range(n):
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| 432 | if data[i] >= window[0] and data[i] < window[1]:
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| 433 | msk[i] = 1
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| 434 | if kwargs.has_key('invert'):
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| 435 | if kwargs.get('invert'):
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| 436 | from numarray import logical_not
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| 437 | msk = logical_not(msk)
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| 438 | return msk
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| 439 |
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| 440 | def set_restfreqs(self, freqs, unit='Hz'):
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| 441 | """
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| 442 | Set the restfrequency(s) for this scantable.
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| 443 | Parameters:
|
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| 444 | freqs: one or more frequencies
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| 445 | unit: optional 'unit', default 'Hz'
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| 446 | Example:
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| 447 | scan.set_restfreqs([1000000000.0])
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| 448 | """
|
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| 449 | if type(freqs) is float or int:
|
|---|
| 450 | freqs = (freqs)
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| 451 | sdtable._setrestfreqs(self,freqs, unit)
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| 452 | return
|
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| 453 |
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|---|
| 454 | def flag_spectrum(self, thebeam, theif, thepol):
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| 455 | """
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|---|
| 456 | This flags a selected spectrum in the scan 'for good'.
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|---|
| 457 | USE WITH CARE - not reversible.
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|---|
| 458 | Use masks for non-permanent exclusion of channels.
|
|---|
| 459 | Parameters:
|
|---|
| 460 | thebeam,theif,thepol: all have to be explicitly
|
|---|
| 461 | specified
|
|---|
| 462 | Example:
|
|---|
| 463 | scan.flag_spectrum(0,0,1)
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|---|
| 464 | flags the spectrum for Beam=0, IF=0, Pol=1
|
|---|
| 465 | """
|
|---|
| 466 | if (thebeam < self.nbeam() and theif < self.nif() and thepol < self.npol()):
|
|---|
| 467 | stable.setbeam(thebeam)
|
|---|
| 468 | stable.setif(theif)
|
|---|
| 469 | stable.setpol(thepol)
|
|---|
| 470 | stable._flag(self)
|
|---|
| 471 | else:
|
|---|
| 472 | print "Please specify a valid (Beam/IF/Pol)"
|
|---|
| 473 | return
|
|---|
| 474 |
|
|---|
| 475 | def plot(self, what='spectrum',col='Pol', panel=None):
|
|---|
| 476 | """
|
|---|
| 477 | Plot the spectra contained in the scan. Alternatively you can also
|
|---|
| 478 | Plot Tsys vs Time
|
|---|
| 479 | Parameters:
|
|---|
| 480 | what: a choice of 'spectrum' (default) or 'tsys'
|
|---|
| 481 | col: which out of Beams/IFs/Pols should be colour stacked
|
|---|
| 482 | panel: set up multiple panels, currently not working.
|
|---|
| 483 | """
|
|---|
| 484 | validcol = {'Beam':self.nbeam(),'IF':self.nif(),'Pol':self.npol()}
|
|---|
| 485 |
|
|---|
| 486 | validyax = ['spectrum','tsys']
|
|---|
| 487 | from asap.asaplot import ASAPlot
|
|---|
| 488 | if not self._p:
|
|---|
| 489 | self._p = ASAPlot()
|
|---|
| 490 | #print "Plotting not enabled"
|
|---|
| 491 | #return
|
|---|
| 492 | if self._p.is_dead:
|
|---|
| 493 | del self._p
|
|---|
| 494 | self._p = ASAPlot()
|
|---|
| 495 | npan = 1
|
|---|
| 496 | x = None
|
|---|
| 497 | if what == 'tsys':
|
|---|
| 498 | n = self.nrow()
|
|---|
| 499 | if n < 2:
|
|---|
| 500 | print "Only one integration. Can't plot."
|
|---|
| 501 | return
|
|---|
| 502 | self._p.hold()
|
|---|
| 503 | self._p.clear()
|
|---|
| 504 | if panel == 'Time':
|
|---|
| 505 | npan = self.nrow()
|
|---|
| 506 | self._p.set_panels(rows=npan)
|
|---|
| 507 | xlab,ylab,tlab = None,None,None
|
|---|
| 508 | self._vb = False
|
|---|
| 509 | sel = self.get_selection()
|
|---|
| 510 | for i in range(npan):
|
|---|
| 511 | if npan > 1:
|
|---|
| 512 | self._p.subplot(i)
|
|---|
| 513 | for j in range(validcol[col]):
|
|---|
| 514 | x = None
|
|---|
| 515 | y = None
|
|---|
| 516 | m = None
|
|---|
| 517 | tlab = self._getsourcename(i)
|
|---|
| 518 | import re
|
|---|
| 519 | tlab = re.sub('_S','',tlab)
|
|---|
| 520 | if col == 'Beam':
|
|---|
| 521 | self.setbeam(j)
|
|---|
| 522 | elif col == 'IF':
|
|---|
| 523 | self.setif(j)
|
|---|
| 524 | elif col == 'Pol':
|
|---|
| 525 | self.setpol(j)
|
|---|
| 526 | if what == 'tsys':
|
|---|
| 527 | x = range(self.nrow())
|
|---|
| 528 | xlab = 'Time [pixel]'
|
|---|
| 529 | m = list(ones(len(x)))
|
|---|
| 530 | y = []
|
|---|
| 531 | ylab = r'$T_{sys}$'
|
|---|
| 532 | for k in range(len(x)):
|
|---|
| 533 | y.append(self._gettsys(k))
|
|---|
| 534 | else:
|
|---|
| 535 | x,xlab = self.get_abcissa(i)
|
|---|
| 536 | y = self.getspectrum(i)
|
|---|
| 537 | ylab = r'Flux'
|
|---|
| 538 | m = self.getmask(i)
|
|---|
| 539 | llab = col+' '+str(j)
|
|---|
| 540 | self._p.set_line(label=llab)
|
|---|
| 541 | self._p.plot(x,y,m)
|
|---|
| 542 | self._p.set_axes('xlabel',xlab)
|
|---|
| 543 | self._p.set_axes('ylabel',ylab)
|
|---|
| 544 | self._p.set_axes('title',tlab)
|
|---|
| 545 | self._p.release()
|
|---|
| 546 | self.set_selection(sel[0],sel[1],sel[2])
|
|---|
| 547 | self._vb = rcParams['verbose']
|
|---|
| 548 | return
|
|---|
