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

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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

Accepted Answer

Honglei Chen
Honglei Chen on 9 Aug 2012
You can use isa
>> help isa

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