isfilevar

This function is used to check if file variables are defined in a file before accessing them.

Synopsis

	function isfilevar( 
		thefile[1]:file,
		varnames:string
	)

Arguments

thefile: thefile is the file to check.
varnames: varnames must be an array of strings but can have any dimension.

Description

For each element in the varnames parameter, isfilevar returns True if the element is a variable of the file referenced by thefile and False if not. The output of isfilevar is a logical array with the same dimensions as the varnames parameter. If the parameter thefile is not a valid file, then a single missing value is returned.

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$Revision: 1.5 $ $Date: 1998/06/15 21:29:50 $