NAME¶

SISNAN - returns .TRUE

SYNOPSIS¶

LOGICAL FUNCTION

SISNAN(SIN)

REAL SIN

PURPOSE¶

SISNAN returns .TRUE. if its argument is NaN, and .FALSE. otherwise. To be replaced by the Fortran 2003 intrinsic in the future.

ARGUMENTS¶

SIN (input) REAL

Input to test for NaN.