NAME¶

DISNAN - returns .TRUE

SYNOPSIS¶

LOGICAL FUNCTION

DISNAN(DIN)

DOUBLE PRECISION DIN

PURPOSE¶

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

ARGUMENTS¶

DIN (input) DOUBLE PRECISION

Input to test for NaN.