[1085] | 1 | from asap.scantable import scantable |
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[258] | 2 | from asap import rcParams |
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[720] | 3 | from asap import print_log |
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[101] | 4 | |
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[143] | 5 | def average_time(*args, **kwargs): |
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[101] | 6 | """ |
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[113] | 7 | Return the (time) average of a scan or list of scans. [in channels only] |
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[305] | 8 | The cursor of the output scan is set to 0 |
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[113] | 9 | Parameters: |
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| 10 | one scan or comma separated scans |
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[143] | 11 | mask: an optional mask (only used for 'var' and 'tsys' weighting) |
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[558] | 12 | scanav: True averages each scan separately. |
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| 13 | False (default) averages all scans together, |
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[1229] | 14 | weight: Weighting scheme. |
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| 15 | 'none' (mean no weight) |
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| 16 | 'var' (1/var(spec) weighted) |
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| 17 | 'tsys' (1/Tsys**2 weighted) |
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| 18 | 'tint' (integration time weighted) |
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| 19 | 'tintsys' (Tint/Tsys**2) |
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| 20 | 'median' ( median averaging) |
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[930] | 21 | align: align the spectra in velocity before averaging. It takes |
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| 22 | the time of the first spectrum in the first scantable |
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| 23 | as reference time. |
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[113] | 24 | Example: |
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| 25 | # return a time averaged scan from scana and scanb |
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| 26 | # without using a mask |
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[129] | 27 | scanav = average_time(scana,scanb) |
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[113] | 28 | # return the (time) averaged scan, i.e. the average of |
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| 29 | # all correlator cycles |
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[558] | 30 | scanav = average_time(scan, scanav=True) |
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[101] | 31 | """ |
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[930] | 32 | scanav = False |
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[143] | 33 | if kwargs.has_key('scanav'): |
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[930] | 34 | scanav = kwargs.get('scanav') |
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[524] | 35 | weight = 'tint' |
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[143] | 36 | if kwargs.has_key('weight'): |
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| 37 | weight = kwargs.get('weight') |
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| 38 | mask = () |
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| 39 | if kwargs.has_key('mask'): |
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| 40 | mask = kwargs.get('mask') |
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[930] | 41 | align = False |
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| 42 | if kwargs.has_key('align'): |
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| 43 | align = kwargs.get('align') |
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[489] | 44 | varlist = vars() |
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[665] | 45 | if isinstance(args[0],list): |
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[981] | 46 | lst = args[0] |
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[665] | 47 | elif isinstance(args[0],tuple): |
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[981] | 48 | lst = list(args[0]) |
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[665] | 49 | else: |
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[981] | 50 | lst = list(args) |
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[720] | 51 | |
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[489] | 52 | del varlist["kwargs"] |
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| 53 | varlist["args"] = "%d scantables" % len(lst) |
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[981] | 54 | # need special formatting here for history... |
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[720] | 55 | |
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[876] | 56 | from asap._asap import stmath |
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| 57 | stm = stmath() |
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[113] | 58 | for s in lst: |
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[101] | 59 | if not isinstance(s,scantable): |
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[720] | 60 | msg = "Please give a list of scantables" |
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| 61 | if rcParams['verbose']: |
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| 62 | print msg |
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| 63 | return |
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| 64 | else: |
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| 65 | raise TypeError(msg) |
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[945] | 66 | if scanav: scanav = "SCAN" |
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| 67 | else: scanav = "NONE" |
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[981] | 68 | alignedlst = [] |
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| 69 | if align: |
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| 70 | refepoch = lst[0].get_time(0) |
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| 71 | for scan in lst: |
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| 72 | alignedlst.append(scan.freq_align(refepoch,insitu=False)) |
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| 73 | else: |
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[1059] | 74 | alignedlst = lst |
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[1229] | 75 | if weight.upper() == 'MEDIAN': |
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| 76 | # median doesn't support list of scantables - merge first |
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| 77 | merged = None |
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| 78 | if len(alignedlst) > 1: |
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| 79 | merged = merge(alignedlst) |
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| 80 | else: |
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| 81 | merged = alignedlst[0] |
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| 82 | s = scantable(stm._averagechannel(merged, 'MEDIAN', scanav)) |
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| 83 | del merged |
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| 84 | else: |
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| 85 | s = scantable(stm._average(alignedlst, mask, weight.upper(), scanav)) |
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[489] | 86 | s._add_history("average_time",varlist) |
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[720] | 87 | print_log() |
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[489] | 88 | return s |
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[101] | 89 | |
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[1074] | 90 | def quotient(source, reference, preserve=True): |
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| 91 | """ |
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| 92 | Return the quotient of a 'source' (signal) scan and a 'reference' scan. |
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| 93 | The reference can have just one scan, even if the signal has many. Otherwise |
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| 94 | they must have the same number of scans. |
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| 95 | The cursor of the output scan is set to 0 |
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| 96 | Parameters: |
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| 97 | source: the 'on' scan |
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| 98 | reference: the 'off' scan |
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| 99 | preserve: you can preserve (default) the continuum or |
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| 100 | remove it. The equations used are |
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| 101 | preserve: Output = Toff * (on/off) - Toff |
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| 102 | remove: Output = Toff * (on/off) - Ton |
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| 103 | """ |
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| 104 | varlist = vars() |
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| 105 | from asap._asap import stmath |
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| 106 | stm = stmath() |
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| 107 | stm._setinsitu(False) |
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| 108 | s = scantable(stm._quotient(source, reference, preserve)) |
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| 109 | s._add_history("quotient",varlist) |
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| 110 | print_log() |
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| 111 | return s |
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[101] | 112 | |
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[296] | 113 | def simple_math(left, right, op='add', tsys=True): |
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[242] | 114 | """ |
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[720] | 115 | Apply simple mathematical binary operations to two |
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[242] | 116 | scan tables, returning the result in a new scan table. |
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| 117 | The operation is applied to both the correlations and the TSys data |
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[305] | 118 | The cursor of the output scan is set to 0 |
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[242] | 119 | Parameters: |
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| 120 | left: the 'left' scan |
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| 121 | right: the 'right' scan |
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| 122 | op: the operation: 'add' (default), 'sub', 'mul', 'div' |
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[296] | 123 | tsys: if True (default) then apply the operation to Tsys |
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| 124 | as well as the data |
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[242] | 125 | """ |
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[489] | 126 | varlist = vars() |
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[876] | 127 | print "Not yet available in asap" |
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| 128 | return |
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[258] | 129 | if not isinstance(left,scantable) and not isinstance(right,scantable): |
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[720] | 130 | msg = "Please provide two scantables as input" |
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| 131 | if rcParams['verbose']: |
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| 132 | print msg |
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| 133 | return |
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| 134 | else: |
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| 135 | raise TypeError(msg) |
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[918] | 136 | s = scantable(stm._bop(left, right, op, tsys)) |
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[489] | 137 | s._add_history("simple_math", varlist) |
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[720] | 138 | print_log() |
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[489] | 139 | return s |
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[918] | 140 | |
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| 141 | def merge(*args): |
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[945] | 142 | """ |
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| 143 | """ |
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[918] | 144 | varlist = vars() |
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| 145 | if isinstance(args[0],list): |
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| 146 | lst = tuple(args[0]) |
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| 147 | elif isinstance(args[0],tuple): |
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| 148 | lst = args[0] |
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| 149 | else: |
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| 150 | lst = tuple(args) |
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| 151 | varlist["args"] = "%d scantables" % len(lst) |
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| 152 | # need special formatting her for history... |
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| 153 | from asap._asap import stmath |
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| 154 | stm = stmath() |
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| 155 | for s in lst: |
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| 156 | if not isinstance(s,scantable): |
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| 157 | msg = "Please give a list of scantables" |
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| 158 | if rcParams['verbose']: |
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| 159 | print msg |
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| 160 | return |
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| 161 | else: |
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| 162 | raise TypeError(msg) |
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| 163 | s = scantable(stm._merge(lst)) |
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| 164 | s._add_history("merge", varlist) |
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| 165 | print_log() |
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| 166 | return s |
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[1074] | 167 | |
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