| 1 | from asap.scantable import scantable
|
|---|
| 2 | from asap import rcParams
|
|---|
| 3 | from asap import print_log
|
|---|
| 4 |
|
|---|
| 5 | def average_time(*args, **kwargs):
|
|---|
| 6 | """
|
|---|
| 7 | Return the (time) average of a scan or list of scans. [in channels only]
|
|---|
| 8 | The cursor of the output scan is set to 0
|
|---|
| 9 | Parameters:
|
|---|
| 10 | one scan or comma separated scans
|
|---|
| 11 | mask: an optional mask (only used for 'var' and 'tsys' weighting)
|
|---|
| 12 | scanav: True averages each scan separately.
|
|---|
| 13 | False (default) averages all scans together,
|
|---|
| 14 | weight: Weighting scheme.
|
|---|
| 15 | 'none' (mean no weight)
|
|---|
| 16 | 'var' (1/var(spec) weighted)
|
|---|
| 17 | 'tsys' (1/Tsys**2 weighted)
|
|---|
| 18 | 'tint' (integration time weighted)
|
|---|
| 19 | 'tintsys' (Tint/Tsys**2)
|
|---|
| 20 | 'median' ( median averaging)
|
|---|
| 21 | align: align the spectra in velocity before averaging. It takes
|
|---|
| 22 | the time of the first spectrum in the first scantable
|
|---|
| 23 | as reference time.
|
|---|
| 24 | Example:
|
|---|
| 25 | # return a time averaged scan from scana and scanb
|
|---|
| 26 | # without using a mask
|
|---|
| 27 | scanav = average_time(scana,scanb)
|
|---|
| 28 | # return the (time) averaged scan, i.e. the average of
|
|---|
| 29 | # all correlator cycles
|
|---|
| 30 | scanav = average_time(scan, scanav=True)
|
|---|
| 31 | """
|
|---|
| 32 | scanav = False
|
|---|
| 33 | if kwargs.has_key('scanav'):
|
|---|
| 34 | scanav = kwargs.get('scanav')
|
|---|
| 35 | weight = 'tint'
|
|---|
| 36 | if kwargs.has_key('weight'):
|
|---|
| 37 | weight = kwargs.get('weight')
|
|---|
| 38 | mask = ()
|
|---|
| 39 | if kwargs.has_key('mask'):
|
|---|
| 40 | mask = kwargs.get('mask')
|
|---|
| 41 | align = False
|
|---|
| 42 | if kwargs.has_key('align'):
|
|---|
| 43 | align = kwargs.get('align')
|
|---|
| 44 | varlist = vars()
|
|---|
| 45 | if isinstance(args[0],list):
|
|---|
| 46 | lst = args[0]
|
|---|
| 47 | elif isinstance(args[0],tuple):
|
|---|
| 48 | lst = list(args[0])
|
|---|
| 49 | else:
|
|---|
| 50 | lst = list(args)
|
|---|
| 51 |
|
|---|
| 52 | del varlist["kwargs"]
|
|---|
| 53 | varlist["args"] = "%d scantables" % len(lst)
|
|---|
| 54 | # need special formatting here for history...
|
|---|
| 55 |
|
|---|
| 56 | from asap._asap import stmath
|
|---|
| 57 | stm = stmath()
|
|---|
| 58 | for s in lst:
|
|---|
| 59 | if not isinstance(s,scantable):
|
|---|
| 60 | msg = "Please give a list of scantables"
|
|---|
| 61 | if rcParams['verbose']:
|
|---|
| 62 | print msg
|
|---|
| 63 | return
|
|---|
| 64 | else:
|
|---|
| 65 | raise TypeError(msg)
|
|---|
| 66 | if scanav: scanav = "SCAN"
|
|---|
| 67 | else: scanav = "NONE"
|
|---|
| 68 | alignedlst = []
|
|---|
| 69 | if align:
|
|---|
| 70 | refepoch = lst[0].get_time(0)
|
|---|
| 71 | for scan in lst:
|
|---|
| 72 | alignedlst.append(scan.freq_align(refepoch,insitu=False))
|
|---|
| 73 | else:
|
|---|
| 74 | alignedlst = lst
|
|---|
| 75 | if weight.upper() == 'MEDIAN':
|
|---|
| 76 | # median doesn't support list of scantables - merge first
|
|---|
| 77 | merged = None
|
|---|
| 78 | if len(alignedlst) > 1:
|
|---|
| 79 | merged = merge(alignedlst)
|
|---|
| 80 | else:
|
|---|
| 81 | merged = alignedlst[0]
|
|---|
| 82 | s = scantable(stm._averagechannel(merged, 'MEDIAN', scanav))
|
|---|
| 83 | del merged
|
|---|
| 84 | else:
|
|---|
| 85 | s = scantable(stm._average(alignedlst, mask, weight.upper(), scanav))
|
|---|
| 86 | s._add_history("average_time",varlist)
|
|---|
| 87 | print_log()
|
|---|
| 88 | return s
|
|---|
| 89 |
|
|---|
| 90 | def quotient(source, reference, preserve=True):
|
|---|
| 91 | """
|
|---|
| 92 | Return the quotient of a 'source' (signal) scan and a 'reference' scan.
|
|---|
| 93 | The reference can have just one scan, even if the signal has many. Otherwise
|
|---|
| 94 | they must have the same number of scans.
|
|---|
| 95 | The cursor of the output scan is set to 0
|
|---|
| 96 | Parameters:
|
|---|
| 97 | source: the 'on' scan
|
|---|
| 98 | reference: the 'off' scan
|
|---|
| 99 | preserve: you can preserve (default) the continuum or
|
|---|
| 100 | remove it. The equations used are
|
|---|
| 101 | preserve: Output = Toff * (on/off) - Toff
|
|---|
| 102 | remove: Output = Toff * (on/off) - Ton
|
|---|
| 103 | """
|
|---|
| 104 | varlist = vars()
|
|---|
| 105 | from asap._asap import stmath
|
|---|
| 106 | stm = stmath()
|
|---|
| 107 | stm._setinsitu(False)
|
|---|
| 108 | s = scantable(stm._quotient(source, reference, preserve))
|
|---|
| 109 | s._add_history("quotient",varlist)
|
|---|
| 110 | print_log()
|
|---|
| 111 | return s
|
|---|
| 112 |
|
|---|
| 113 | def simple_math(left, right, op='add', tsys=True):
|
|---|
| 114 | """
|
|---|
| 115 | Apply simple mathematical binary operations to two
|
|---|
| 116 | scan tables, returning the result in a new scan table.
|
|---|
| 117 | The operation is applied to both the correlations and the TSys data
|
|---|
| 118 | The cursor of the output scan is set to 0
|
|---|
| 119 | Parameters:
|
|---|
| 120 | left: the 'left' scan
|
|---|
| 121 | right: the 'right' scan
|
|---|
| 122 | op: the operation: 'add' (default), 'sub', 'mul', 'div'
|
|---|
| 123 | tsys: if True (default) then apply the operation to Tsys
|
|---|
| 124 | as well as the data
|
|---|
| 125 | """
|
|---|
| 126 | print "simple_math is deprecated use +=/* instead."
|
|---|
| 127 |
|
|---|
| 128 | def merge(*args):
|
|---|
| 129 | """
|
|---|
| 130 | """
|
|---|
| 131 | varlist = vars()
|
|---|
| 132 | if isinstance(args[0],list):
|
|---|
| 133 | lst = tuple(args[0])
|
|---|
| 134 | elif isinstance(args[0],tuple):
|
|---|
| 135 | lst = args[0]
|
|---|
| 136 | else:
|
|---|
| 137 | lst = tuple(args)
|
|---|
| 138 | varlist["args"] = "%d scantables" % len(lst)
|
|---|
| 139 | # need special formatting her for history...
|
|---|
| 140 | from asap._asap import stmath
|
|---|
| 141 | stm = stmath()
|
|---|
| 142 | for s in lst:
|
|---|
| 143 | if not isinstance(s,scantable):
|
|---|
| 144 | msg = "Please give a list of scantables"
|
|---|
| 145 | if rcParams['verbose']:
|
|---|
| 146 | print msg
|
|---|
| 147 | return
|
|---|
| 148 | else:
|
|---|
| 149 | raise TypeError(msg)
|
|---|
| 150 | s = scantable(stm._merge(lst))
|
|---|
| 151 | s._add_history("merge", varlist)
|
|---|
| 152 | print_log()
|
|---|
| 153 | return s
|
|---|
| 154 |
|
|---|
