N_STRUCT

       To determine if variable is a structure and return number of elements.

       n = N_struct( var, ntags )

       var = any variable.

       ntags = number of structure tags.

       Returns zero if variable is not a structure, otherwise returns # elems.

       Determine if argument is a structure by checking for # of tags.
       If structure, use size function to get # of elements
       (instead of N_elements) so that it works on I/O associated structures.

       Written, Frank Varosi NASA/GSFC 1989.
       Converted to IDL V5.0   W. Landsman   September 1997

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