logical function disnan

(

double precision

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.

Date

September 2012

Definition at line 61 of file disnan.f.

*
*  -- LAPACK auxiliary routine (version 3.4.2) --
*  -- LAPACK is a software package provided by Univ. of Tennessee,    --
*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
*     September 2012
*
*     .. Scalar Arguments ..
      DOUBLE PRECISION   din
*     ..
*
*  =====================================================================
*
*  .. External Functions ..
      LOGICAL dlaisnan
      EXTERNAL dlaisnan
*  ..
*  .. Executable Statements ..
      disnan = dlaisnan(din,din)
      RETURN