MATLAB Application Program Interface Reference

Get the value of Not-a-Number

#include "matrix.h"
double mxGetNaN(void);

Returns

The value of Not-a-Number on your system.

Description

Call mxGetNaN to return the value of NaN for your system. NaN is the IEEE arithmetic representation for Not-a-Number. Certain mathematical operations return NaN as a result, for example:

0.0/0.0
inf-inf

The value of Not-a-Number is built in to the system; you cannot modify it.