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Version 1.9 Build 1488

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vlafilleroldweights - Function

	Package	nrao
	Module	vla

Use an older weighting scheme

Synopsis
vlafilleroldweights(msname)

Description

This global function will change the weights of the supplied measurement set to a value that only depends on the integration time. The values in the WEIGHT column will be changed to one tenth of the value in the EXPOSURE column and the values in the SIGMA column will be changed to the inverse square-root of the new value in the WEIGHT column. This was the original behaviour of the vlafiller tool.

From release 1.5 the vlafiller tool sets the weights to a value that depends on the integration time, bandwidth and system temperature of the relevant antennas. This is believed to be more representative of the errors in the observation.

This function returns T is everything went well and F otherwise.

Arguments

msname		The measurement set name.
		Allowed:	string
		Default:	no default

Returns
T or F

Example

      include 'vlafiller.g'
      vlafilleroldweights('ab123.ms');

This example resets the weights in the measurement set 'ab123.ms'. There is no way to back out of this change so if you need to compare both weighting schemes you should copy your data to a separate measurement set prior to running this function.