◆ disnan()

logical function disnan ( double precision, intent(in) DIN )

DISNAN tests input for NaN.

Download DISNAN + dependencies [TGZ] [ZIP] [TXT]

Purpose:

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

Parameters

[in]

DIN

          DIN is DOUBLE PRECISION
          Input to test for NaN.

Author: Univ. of Tennessee; Univ. of California Berkeley; Univ. of Colorado Denver; NAG Ltd.