This function is used to check if file variables are defined in a file before accessing them.
- thefile is the file to check.
- varnames must be an array of strings but can have any dimension.
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 $