Returns the dimension sizes of a file variable.
thefile  : file,
varname  : string
- reference to a file
- string name of variable whose dimension sizes are desired
This function works just like dimsizes but for file variables. This function should be used rather that dimsizes when the
variable is in a file. dimsizes is very inefficient to use on file variables because it reads the entire variable
in. Therefore, filevardimsizes should be used exclusively when querying the dimensionality of variables in files.
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$Revision: 1.4 $ $Date: 1998/06/15 21:29:24 $