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vlafiller.selectfrequency - Function

	Package	nrao
	Module	vla
	Tool	vlafiller

Select which frequency-range to convert

Synopsis
selectfrequency(centerfrequency, bandwidth)

Description

The selectfrequency function filters the data so that only some of it is copied to the output measurement set. The frequency band is specified using a center frequency and a bandwidth around that frequency. These frequencies are specified using strings to include the necessary units ie., kHz, MHz etc. This function rejects input records were all the correlations are entirely outside the specified frequency band. It cannot be used to select channels, this must be done after the measurement set has been created. For example if a spectral line observation has data in ten channels between 100MHz and 200MHz then calling this function with a center frequency of 200MHz and a bandwidth of 40MHz will include all of the data between 100MHz and 200MHz and not just the last two channels.

If any of the input parameters is unset then no frequency selection is done. This is the default.

This functions returns F if the selection could not be done.

Arguments

centerfrequency		The center frequency.
		Allowed:	string
		Default:	unset
bandwidth		The range of frequencies around the center frequency.
		Allowed:	string
		Default:	unset

Returns
T or F

Example
See the example for the selecttime function.