nan?

From: Jason Evans (jason.evans AT XXXXXX)
Date: Wed Oct 03 2001 - 10:26:42 MDT

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excuse this perhaps silly question but I take an average of a 2-d array
using the avg function and am returned nan

what does nan mean?

and what might cause this?

thanks,
jason

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Jason Evans                             Ph: 1 203 432-3279
Dept. of Geology and Geophysics         fax: 1 203 432-3134
Yale University                         email:jason.evans@yale.edu
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