External Interfaces/API Reference

mexIsNaN

Determine whether or not a value is NaN (Not-a-Number)

Fortran Syntax

integer*4 function mexIsNaN(value)
real*8 value

Arguments
value
   The double-precision, floating-point number you are testing.

Returns

true if value is NaN (Not-a-Number), and false otherwise.

Description

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

See Also

mexIsFinite, mexIsInf, mexGetInf

mexIsInf

mexPrintf