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mexIsNaN
Determine whether or not a value is Not-a-Number (NaN)
integer*4 function mexIsNaN(value) real*8 valuevalue
The double-precision, floating-point number you are testing.
true if value is Not-a-Number; otherwise, returns false.
Call mexIsNaN to determine whether or not value is equal to NaN, the IEEE arithmetic representation for Not-a-Number. A NaN is obtained as a result of mathematically undefined operations such as
0.0/0.0
inf - inf
mexIsFinite, mexIsInf, mexGetInf