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vlafiller.selecttime - Function

	Package	nrao
	Module	vla
	Tool	vlafiller

Select which time-range to convert

Synopsis
selecttime(start, stop)

Description

The selecttime function filters the data so that only some of it is copied to the output measurement set. Only data that have been observed^1.5 between the specified start and stop times will be copied to the output measurement set. The times are specified using any of the string formats that can be interpreted by the quanta module (see the section on time formatting).

If the start input parameter is unset then it defaults to 'a long time in the past'. Similarly if the stop input parameter is unset it defaults to 'along time in the future'. Hence using this function with no input parameters disables any time selection.

It is important to specify both the day and time portions for the start and stop time. Otherwise the day will default to the day with the modified Julian day of zero ie. the 17-Nov-1858. If you want to fill in the current date for the day number you can preceed the time with a slash. eg., start='/6:45'.

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

Arguments

start		The beginning of the time range.
		Allowed:	string
		Default:	unset
stop		The end of the time range.
		Allowed:	string
		Default:	unset

Returns
T or F

Example

      include 'vlafiller.g'
      v := vlafiller() 
      v.diskinput('file1.vla') 
      v.output('file1.ms') 
      v.selecttime(start='31Dec00/00:00:00.123', 
	           stop='31-Dec-2000/23:59:59.876') 
      v.selectfrequency(centerfrequency='1.4GHz', bandwidth='200MHz') 
      v.fill() 
      v.done()

This example selects all the data that was observed on the last day of the millennium where any part of the observation was between 1.3GHz and 1.5GHz. See the example for the vlafiller constructor for a more complete discreption of other parts of this example.