1 | from asap.scantable import scantable
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2 | from asap import rcParams
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3 | from asap import print_log
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4 | from asap import selector
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5 | from asap import asaplog
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6 |
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7 | def average_time(*args, **kwargs):
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8 | """
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9 | Return the (time) average of a scan or list of scans. [in channels only]
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10 | The cursor of the output scan is set to 0
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11 | Parameters:
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12 | one scan or comma separated scans or a list of scans
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13 | mask: an optional mask (only used for 'var' and 'tsys' weighting)
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14 | scanav: True averages each scan separately.
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15 | False (default) averages all scans together,
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16 | weight: Weighting scheme.
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17 | 'none' (mean no weight)
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18 | 'var' (1/var(spec) weighted)
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19 | 'tsys' (1/Tsys**2 weighted)
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20 | 'tint' (integration time weighted)
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21 | 'tintsys' (Tint/Tsys**2)
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22 | 'median' ( median averaging)
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23 | align: align the spectra in velocity before averaging. It takes
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24 | the time of the first spectrum in the first scantable
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25 | as reference time.
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26 | Example:
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27 | # return a time averaged scan from scana and scanb
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28 | # without using a mask
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29 | scanav = average_time(scana,scanb)
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30 | # or equivalent
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31 | # scanav = average_time([scana, scanb])
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32 | # return the (time) averaged scan, i.e. the average of
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33 | # all correlator cycles
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34 | scanav = average_time(scan, scanav=True)
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35 | """
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36 | scanav = False
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37 | if kwargs.has_key('scanav'):
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38 | scanav = kwargs.get('scanav')
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39 | weight = 'tint'
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40 | if kwargs.has_key('weight'):
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41 | weight = kwargs.get('weight')
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42 | mask = ()
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43 | if kwargs.has_key('mask'):
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44 | mask = kwargs.get('mask')
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45 | align = False
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46 | if kwargs.has_key('align'):
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47 | align = kwargs.get('align')
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48 | compel = False
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49 | if kwargs.has_key('compel'):
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50 | compel = kwargs.get('compel')
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51 | varlist = vars()
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52 | if isinstance(args[0],list):
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53 | lst = args[0]
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54 | elif isinstance(args[0],tuple):
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55 | lst = list(args[0])
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56 | else:
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57 | lst = list(args)
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58 |
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59 | del varlist["kwargs"]
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60 | varlist["args"] = "%d scantables" % len(lst)
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61 | # need special formatting here for history...
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62 |
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63 | from asap._asap import stmath
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64 | stm = stmath()
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65 | for s in lst:
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66 | if not isinstance(s,scantable):
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67 | msg = "Please give a list of scantables"
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68 | if rcParams['verbose']:
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69 | #print msg
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70 | asaplog.push(msg)
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71 | print_log('ERROR')
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72 | return
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73 | else:
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74 | raise TypeError(msg)
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75 | if scanav: scanav = "SCAN"
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76 | else: scanav = "NONE"
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77 | alignedlst = []
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78 | if align:
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79 | refepoch = lst[0].get_time(0)
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80 | for scan in lst:
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81 | alignedlst.append(scan.freq_align(refepoch,insitu=False))
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82 | else:
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83 | alignedlst = lst
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84 | if weight.upper() == 'MEDIAN':
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85 | # median doesn't support list of scantables - merge first
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86 | merged = None
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87 | if len(alignedlst) > 1:
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88 | merged = merge(alignedlst)
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89 | else:
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90 | merged = alignedlst[0]
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91 | s = scantable(stm._averagechannel(merged, 'MEDIAN', scanav))
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92 | del merged
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93 | else:
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94 | #s = scantable(stm._average(alignedlst, mask, weight.upper(), scanav))
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95 | s = scantable(stm._new_average(alignedlst, compel, mask, weight.upper(), scanav))
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96 | s._add_history("average_time",varlist)
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97 | print_log()
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98 | return s
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99 |
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100 | def quotient(source, reference, preserve=True):
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101 | """
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102 | Return the quotient of a 'source' (signal) scan and a 'reference' scan.
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103 | The reference can have just one scan, even if the signal has many. Otherwise
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104 | they must have the same number of scans.
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105 | The cursor of the output scan is set to 0
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106 | Parameters:
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107 | source: the 'on' scan
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108 | reference: the 'off' scan
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109 | preserve: you can preserve (default) the continuum or
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110 | remove it. The equations used are
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111 | preserve: Output = Toff * (on/off) - Toff
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112 | remove: Output = Toff * (on/off) - Ton
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113 | """
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114 | varlist = vars()
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115 | from asap._asap import stmath
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116 | stm = stmath()
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117 | stm._setinsitu(False)
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118 | s = scantable(stm._quotient(source, reference, preserve))
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119 | s._add_history("quotient",varlist)
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120 | print_log()
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121 | return s
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122 |
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123 | def dototalpower(calon, caloff, tcalval=0.0):
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124 | """
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125 | Do calibration for CAL on,off signals.
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126 | Adopted from GBTIDL dototalpower
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127 | Parameters:
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128 | calon: the 'cal on' subintegration
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129 | caloff: the 'cal off' subintegration
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130 | tcalval: user supplied Tcal value
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131 | """
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132 | varlist = vars()
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133 | from asap._asap import stmath
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134 | stm = stmath()
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135 | stm._setinsitu(False)
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136 | s = scantable(stm._dototalpower(calon, caloff, tcalval))
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137 | s._add_history("dototalpower",varlist)
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138 | print_log()
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139 | return s
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140 |
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141 | def dosigref(sig, ref, smooth, tsysval=0.0, tauval=0.0):
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142 | """
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143 | Calculate a quotient (sig-ref/ref * Tsys)
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144 | Adopted from GBTIDL dosigref
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145 | Parameters:
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146 | sig: on source data
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147 | ref: reference data
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148 | smooth: width of box car smoothing for reference
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149 | tsysval: user specified Tsys (scalar only)
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150 | tauval: user specified Tau (required if tsysval is set)
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151 | """
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152 | varlist = vars()
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153 | from asap._asap import stmath
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154 | stm = stmath()
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155 | stm._setinsitu(False)
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156 | s = scantable(stm._dosigref(sig, ref, smooth, tsysval, tauval))
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157 | s._add_history("dosigref",varlist)
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158 | print_log()
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159 | return s
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160 |
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161 | def calps(scantab, scannos, smooth=1, tsysval=0.0, tauval=0.0, tcalval=0.0):
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162 | """
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163 | Calibrate GBT position switched data
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164 | Adopted from GBTIDL getps
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165 | Currently calps identify the scans as position switched data if they
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166 | contain '_ps' in the source name. The data must contains 'CAL' signal
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167 | on/off in each integration. To identify 'CAL' on state, the word, 'calon'
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168 | need to be present in the source name field.
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169 | (GBT MS data reading process to scantable automatically append these
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170 | id names to the source names)
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171 |
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172 | Parameters:
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173 | scantab: scantable
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174 | scannos: list of scan numbers
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175 | smooth: optional box smoothing order for the reference
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176 | (default is 1 = no smoothing)
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177 | tsysval: optional user specified Tsys (default is 0.0,
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178 | use Tsys in the data)
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179 | tauval: optional user specified Tau
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180 | tcalval: optional user specified Tcal (default is 0.0,
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181 | use Tcal value in the data)
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182 | """
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183 | varlist = vars()
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184 | # check for the appropriate data
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185 | s = scantab.get_scan('*_ps*')
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186 | if s is None:
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187 | msg = "The input data appear to contain no position-switch mode data."
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188 | if rcParams['verbose']:
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189 | #print msg
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190 | asaplog.push(msg)
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191 | print_log('ERROR')
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192 | return
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193 | else:
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194 | raise TypeError(msg)
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195 | ssub = s.get_scan(scannos)
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196 | if ssub is None:
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197 | msg = "No data was found with given scan numbers!"
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198 | if rcParams['verbose']:
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199 | #print msg
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200 | asaplog.push(msg)
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201 | print_log('ERROR')
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202 | return
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203 | else:
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204 | raise TypeError(msg)
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205 | ssubon = ssub.get_scan('*calon')
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206 | ssuboff = ssub.get_scan('*[^calon]')
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207 | if ssubon.nrow() != ssuboff.nrow():
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208 | msg = "mismatch in numbers of CAL on/off scans. Cannot calibrate. Check the scan numbers."
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209 | if rcParams['verbose']:
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210 | #print msg
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211 | asaplog.push(msg)
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212 | print_log('ERROR')
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213 | return
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214 | else:
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215 | raise TypeError(msg)
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216 | cals = dototalpower(ssubon, ssuboff, tcalval)
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217 | sig = cals.get_scan('*ps')
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218 | ref = cals.get_scan('*psr')
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219 | if sig.nscan() != ref.nscan():
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220 | msg = "mismatch in numbers of on/off scans. Cannot calibrate. Check the scan numbers."
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221 | if rcParams['verbose']:
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222 | #print msg
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223 | asaplog.push(msg)
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224 | print_log('ERROR')
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225 | return
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226 | else:
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227 | raise TypeError(msg)
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228 |
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229 | #for user supplied Tsys
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230 | if tsysval>0.0:
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231 | if tauval<=0.0:
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232 | msg = "Need to supply a valid tau to use the supplied Tsys"
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233 | if rcParams['verbose']:
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234 | #print msg
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235 | asaplog.push(msg)
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236 | print_log('ERROR')
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237 | return
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238 | else:
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239 | raise TypeError(msg)
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240 | else:
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241 | sig.recalc_azel()
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242 | ref.recalc_azel()
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243 | #msg = "Use of user specified Tsys is not fully implemented yet."
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244 | #if rcParams['verbose']:
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245 | # print msg
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246 | # return
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247 | #else:
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248 | # raise TypeError(msg)
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249 | # use get_elevation to get elevation and
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250 | # calculate a scaling factor using the formula
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251 | # -> tsys use to dosigref
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252 |
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253 | #ress = dosigref(sig, ref, smooth, tsysval)
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254 | ress = dosigref(sig, ref, smooth, tsysval, tauval)
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255 | ress._add_history("calps", varlist)
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256 | print_log()
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257 | return ress
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258 |
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259 | def calnod(scantab, scannos=[], smooth=1, tsysval=0.0, tauval=0.0, tcalval=0.0):
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260 | """
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261 | Do full (but a pair of scans at time) processing of GBT Nod data
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262 | calibration.
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263 | Adopted from GBTIDL's getnod
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264 | Parameters:
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265 | scantab: scantable
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266 | scannos: a pair of scan numbers, or the first scan number of the pair
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267 | smooth: box car smoothing order
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268 | tsysval: optional user specified Tsys value
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269 | tauval: optional user specified tau value (not implemented yet)
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270 | tcalval: optional user specified Tcal value
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271 | """
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272 | varlist = vars()
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273 | from asap._asap import stmath
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274 | stm = stmath()
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275 | stm._setinsitu(False)
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276 |
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277 | # check for the appropriate data
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278 | s = scantab.get_scan('*_nod*')
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279 | if s is None:
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280 | msg = "The input data appear to contain no Nod observing mode data."
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281 | if rcParams['verbose']:
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282 | #print msg
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283 | asaplog.push(msg)
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284 | print_log('ERROR')
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285 | return
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286 | else:
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287 | raise TypeError(msg)
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288 |
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289 | # need check correspondance of each beam with sig-ref ...
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290 | # check for timestamps, scan numbers, subscan id (not available in
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291 | # ASAP data format...). Assume 1st scan of the pair (beam 0 - sig
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292 | # and beam 1 - ref...)
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293 | # First scan number of paired scans or list of pairs of
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294 | # scan numbers (has to have even number of pairs.)
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295 |
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296 | #data splitting
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297 | scan1no = scan2no = 0
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298 |
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299 | if len(scannos)==1:
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300 | scan1no = scannos[0]
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301 | scan2no = scannos[0]+1
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302 | pairScans = [scan1no, scan2no]
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303 | else:
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304 | #if len(scannos)>2:
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305 | # msg = "calnod can only process a pair of nod scans at time."
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306 | # if rcParams['verbose']:
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307 | # print msg
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308 | # return
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309 | # else:
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310 | # raise TypeError(msg)
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311 | #
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312 | #if len(scannos)==2:
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313 | # scan1no = scannos[0]
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314 | # scan2no = scannos[1]
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315 | pairScans = list(scannos)
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316 |
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317 | if tsysval>0.0:
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318 | if tauval<=0.0:
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319 | msg = "Need to supply a valid tau to use the supplied Tsys"
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320 | if rcParams['verbose']:
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321 | #print msg
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322 | asaplog.push(msg)
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323 | print_log('ERROR')
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324 | return
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325 | else:
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326 | raise TypeError(msg)
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327 | else:
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328 | scantab.recalc_azel()
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329 | resspec = scantable(stm._donod(scantab, pairScans, smooth, tsysval,tauval,tcalval))
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330 | resspec._add_history("calnod",varlist)
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331 | print_log()
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332 | return resspec
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333 |
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334 | def calfs(scantab, scannos=[], smooth=1, tsysval=0.0, tauval=0.0, tcalval=0.0):
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335 | """
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336 | Calibrate GBT frequency switched data.
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337 | Adopted from GBTIDL getfs.
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338 | Currently calfs identify the scans as frequency switched data if they
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339 | contain '_fs' in the source name. The data must contains 'CAL' signal
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340 | on/off in each integration. To identify 'CAL' on state, the word, 'calon'
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341 | need to be present in the source name field.
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342 | (GBT MS data reading via scantable automatically append these
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343 | id names to the source names)
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344 |
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345 | Parameters:
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346 | scantab: scantable
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347 | scannos: list of scan numbers
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348 | smooth: optional box smoothing order for the reference
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349 | (default is 1 = no smoothing)
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350 | tsysval: optional user specified Tsys (default is 0.0,
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351 | use Tsys in the data)
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352 | tauval: optional user specified Tau
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353 | """
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354 | varlist = vars()
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355 | from asap._asap import stmath
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356 | stm = stmath()
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357 | stm._setinsitu(False)
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358 |
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359 | # check = scantab.get_scan('*_fs*')
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360 | # if check is None:
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361 | # msg = "The input data appear to contain no Nod observing mode data."
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362 | # if rcParams['verbose']:
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363 | # print msg
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364 | # return
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365 | # else:
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366 | # raise TypeError(msg)
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367 | s = scantab.get_scan(scannos)
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368 | del scantab
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369 |
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370 | resspec = scantable(stm._dofs(s, scannos, smooth, tsysval,tauval,tcalval))
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371 | resspec._add_history("calfs",varlist)
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372 | print_log()
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373 | return resspec
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374 |
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375 | def simple_math(left, right, op='add', tsys=True):
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376 | """
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377 | Apply simple mathematical binary operations to two
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378 | scan tables, returning the result in a new scan table.
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379 | The operation is applied to both the correlations and the TSys data
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380 | The cursor of the output scan is set to 0
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381 | Parameters:
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382 | left: the 'left' scan
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383 | right: the 'right' scan
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384 | op: the operation: 'add' (default), 'sub', 'mul', 'div'
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385 | tsys: if True (default) then apply the operation to Tsys
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386 | as well as the data
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387 | """
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388 | #print "simple_math is deprecated use +=/* instead."
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389 | asaplog.push( "simple_math is deprecated use +=/* instead." )
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390 | print_log('WARN')
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391 |
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392 | def merge(*args):
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393 | """
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394 | Merge a list of scanatables, or comma-sperated scantables into one
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395 | scnatble.
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396 | Parameters:
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397 | A list [scan1, scan2] or scan1, scan2.
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398 | Example:
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399 | myscans = [scan1, scan2]
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400 | allscans = merge(myscans)
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401 | # or equivalent
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402 | sameallscans = merge(scan1, scan2)
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403 | """
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404 | varlist = vars()
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405 | if isinstance(args[0],list):
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406 | lst = tuple(args[0])
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407 | elif isinstance(args[0],tuple):
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408 | lst = args[0]
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409 | else:
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410 | lst = tuple(args)
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411 | varlist["args"] = "%d scantables" % len(lst)
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412 | # need special formatting her for history...
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413 | from asap._asap import stmath
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414 | stm = stmath()
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415 | for s in lst:
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416 | if not isinstance(s,scantable):
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417 | msg = "Please give a list of scantables"
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418 | if rcParams['verbose']:
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419 | #print msg
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420 | asaplog.push(msg)
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421 | print_log('ERROR')
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422 | return
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423 | else:
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424 | raise TypeError(msg)
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425 | s = scantable(stm._merge(lst))
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426 | s._add_history("merge", varlist)
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427 | print_log()
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428 | return s
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429 |
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