?isnan

Tests input for NaN.

Syntax

val = sisnan( sin )

val = disnan( din )

Include Files

The FORTRAN 77 interfaces are specified in the mkl_lapack.fi include file (to be used in Fortran programs) and in the mkl_lapack.h include file (to be used in C programs).

Description

This logical routine returns .TRUE. if its argument is NaN, and .FALSE. otherwise.

Input Parameters

sin

REAL for sisnan

Input to test for NaN.

din

DOUBLE PRECISION for disnan

Input to test for NaN.

Output Parameters

val: Logical. Result of the test.