NaN in intel fortran 9.0 for windows integrated with VS.Net

I am solving some numerical functions under intel fortran 9.0 for
windows integrated with VS.Net .However, my results have a lot of NaN
which I don't know how to handle.Most of my variable are very
small,like e-0003.I am wondering if it's because of my small
variables.Or I have something wrong with my algorithm.If I want to
track the variable which changes to NaN first,how can I do?
Any suggestion and advise about this are highly appreciated.

Best,

Bei

.

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