ISNAN - 5.2 English - 68552

ISNAN tests input for NaN.

Purpose:

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

Parameters:

SIN – [in]

SIN is REAL

Input to test for NaN.

Returns:

LOGICAL Boolean. Return TRUE if argument is NAN.