This function is used to check if
attributes are defined in a file variable before accessing them.
- thefile is the file to check.
- varname must be single string variable name.
- attnames must be an array of strings, but can have any dimension.
For each element in the attnames parameter,
isfilevaratt returns True if the element is an
attribute of the file variable varname in the file
thefile and False if not. The output of
isfilevaratt is a logical array with the
same dimensions as the attnames parameter. If the
parameter thefile is not a valid file or varname
isn't a defined file variable, then a single missing value is returned.
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$Revision: 1.5 $ $Date: 1998/06/15 21:29:51 $