oldhanningsmooth

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0.1.78 oldhanningsmooth

Requires:

Synopsis
Hanning smooth frequency channel data to remove Gibbs ringing

Description

T H I S T A S K I S D E P R E C A T E D I T W I L L B E R E M O V E D S O O N

This function Hanning smoothes the frequency channels with a weighted running average. The weights are 0.5 for the central channel and 0.25 for each of the two adjacent channels. The first and last channels are flagged. Inclusion of a flagged value in an average causes that data value to be flagged. If an ’outputvis’ filename is given, the task will copy the input file to the output file name first, including all columns that are present in the input MS. After that step it will smooth the column(s) as requested in the ’datacolumn’ parameter. Alternatively, if no ’outputvis’ is specified, oldhanningsmooth will work directly on the input visibility file. If the ’CORRECTED’ data column is requested for an MS that does not contain this column, it will be filled from the ’DATA’ column and then smoothed.

WARNING: by default, all visibility columns will be smoothed. This will modify the DATA column of the output MS in order to make sure that later gaincal will work on the smoothed data, e.g. as part of self-cal.

Arguments


Inputs
vis	Name of input visibility file (MS)
	allowed:	string
	Default:
datacolumn	the name of the MS column into which to write the smoothed data
	allowed:	string
	Default:	all
outputvis	name of the output visibility file (MS)
	allowed:	string
	Default:

Returns
void

Example

    Keyword arguments:
    vis -- Name of input visibility file (MS)
           default: none; example: vis=’ngc5921.ms’
    datacolumn -- the name of the MS column to be Hanning smoothed
                  default=’all’; example: datacolumn=’corrected’
                  options: ’corrected’, ’data’, ’all’
    outputvis -- name of the output visibility file (MS)
                 default=none (write to the input MS); example: outputvis=’ngc5921_src.ms’

    oldhanningsmooth(vis=’ngc4852.ms’, datacolumn=’data’, outputvis=’ngc4852-hs.ms’)

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