How do I best determine if something is "NaN"?

2013 5 15
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I am calculating the ILU factorization of a matrix (repeatedly over a large number of iterations) and at some point norm(U\(L\A)-eye(n),'fro') evaluates to "NaN" (and therefore GMRES does not work). I would like to catch the code immediately before it calls GMRES when this occurs. What is the best way to ask Matlab to stop when norm(U\(L\A)-eye(n),'fro') is NaN?

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