Intel® oneAPI Math Kernel Library Developer Reference - Fortran

?isnan

Tests input for NaN.

Syntax

val = sisnan( sin )

val = disnan( din )

Include Files

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.

Parent topic: LAPACK Auxiliary Routines