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| == Help on accum task: ==
| | {{accum}} |
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| <pre>
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| Accumulate incremental calibration solutions into a calibration table
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| Accum will interpolate and extrapolate a temporal calibration
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| table onto a new table that has a regularly-space time grid.
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| The first run of accum defines the time grid and fills this
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| table with the results from the input table.
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| Subsequent use of accum will combine additional calibration
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| tables onto the same grid of the initial accum table to obtain
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| an output accum table. See below for a concrete example.
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| Keyword arguments:
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| vis -- Name of input visibility file
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| default: none. example: vis='ngc5921.ms'
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| tablein -- Input cumulative calibration table.
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| default: '' means none
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| On first execution of accum, tablein=''
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| and accumtime is used to generate tablein with
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| the specified time gridding.
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| accumtime -- The time separation when making tablein.
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| default: 1.0 (1 second). This time should not be
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| less than the visibiility sampling time, but should
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| be less than about 30% of a typical scan length.
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| incrtable -- The calibration data to be interpolated onto the
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| tablein file.
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| default: ''. Must be specified
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| caltable -- The output cumulated calibration file.
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| default: '' means use tablein as the output file
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|
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| field -- Select field(s) from tablein to process.
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| ['go listobs' to obtain the list id's or names]
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| default: ''= all fields
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| If field string is a non-negative integer, it is assumed to
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| be a field index otherwise, it is assumed to be a field name
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| field='0~2'; field ids 0,1,2
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| field='0,4,5~7'; field ids 0,4,5,6,7
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| field='3C286,3C295'; field named 3C286 and 3C295
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| field = '3,4C*'; field id 3, all names starting with 4C
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| calfield -- Select field(s) from incrtable to process.
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| default: '' = all fields
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| interp -- Interpolation mode (in time) to use for each gaintable
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| default: '' --> 'linear' for all gaintable(s)
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| example: interp='nearest'
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| interp=['nearest','linear'] (for multiple gaintables)
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| Options: 'nearest', 'linear', 'aipslin'
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| spwmap -- Spectral windows combinations to form for gaintable(s)
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| default: [] (apply solutions from each spw to that spw only)
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| Example: spwmap=[0,0,1,1] means apply the caltable solutions
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| from spw = 0 to the spw 0,1 and spw 1 to spw 2,3.
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| spwmap=[[0,0,1,1],[0,1,0,1]] (for multiple gaintables)
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| async -- Run task in a separate process
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| default: False; example: async=True
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| Examples:
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| Create an accum table with 10-sec sampling, filling it with the calibration
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| in 'first_cal' with the desired interpolation.
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| taskname = 'accum'
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| default()
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| vis = 'mydata.ms'
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| tablein = ''
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| accumtime = 10
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| incrtable = 'first_cal'
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| caltable = 'accum1_cal'
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| accum()
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| If you plot 'accum1_cal' with plotcal, you can see how the incrtable was
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| interpolated.
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| Continue accumulating calibrations in accum1_cal from 'second_cal'
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| taskname = 'accum'
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| default()
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| vis = 'mydata.ms'
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| tablein = 'accum1_cal'
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| incrtable = 'second_cal'
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| caltable = 'accum1_cal'
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| accum()
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| Incorporate gaincurve, opacity, parang once and for all
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| taskname= 'gaincal'
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| vis = 'mydata.ms'
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| caltable = 'first_cal'
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| etc
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| gaincurve = T
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| opacity = 0.11
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| parang = T
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| gaincal()
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| tablein = ''
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| accumtime = 10
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| incrtable = 'first_cal'
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| caltable = 'accum1_cal'
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| accum()
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| If you plot 'accum1_cal' with plotcal, you can see how the incrtable was
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| interpolated.
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| Continue accumulating calibrations in accum1_cal from 'second_cal'
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| taskname = 'accum'
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| default()
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| vis = 'mydata.ms'
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| tablein = 'accum1_cal'
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| incrtable = 'second_cal'
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| caltable = 'accum1_cal'
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| accum()
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| Incorporate gaincurve, opacity, parang once and for all
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| taskname= 'gaincal'
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| vis = 'mydata.ms'
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| caltable = 'first_cal'
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| etc
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| gaincurve = T
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| opacity = 0.11
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| parang = T
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| gaincal()
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| taskname = 'accum'
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| default()
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| vis = 'mydata.ms'
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| tablein = ''
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| accumtime = 10
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| incrtable = 'first_cal'
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| caltable = 'accum1_cal'
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| accum()
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| accum1_cal with contain not only the gaincal solution, but the gaincurve,
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| opacity and parang correction. Hence, when applying accum1_cal
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| on the fly for subsequent calibrations (gaincal, bandpass) or applying
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| the calibrations, then
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| gaincurve=F; opacity = 0.0; parang = F should be used
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|
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| </pre>
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