how to tell the class of a variable (non-numeric) in a program?

I am reading a header from files. Most of the time, this header is a cell, but sometime it can be a structure with the cell being a field in the struct.

I need to identify the class of the header after I read the file so I can program accordingly.

Any suggestions?

Thanks,

Feng

Answer 1

[Honglei Chen]

You can use isa

>> help isa