1*> \brief \b DISNAN tests input for NaN.
2*
3*  =========== DOCUMENTATION ===========
4*
5* Online html documentation available at
6*            http://www.netlib.org/lapack/explore-html/
7*
8*> \htmlonly
9*> Download DISNAN + dependencies
10*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/disnan.f">
11*> [TGZ]</a>
12*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/disnan.f">
13*> [ZIP]</a>
14*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/disnan.f">
15*> [TXT]</a>
16*> \endhtmlonly
17*
18*  Definition:
19*  ===========
20*
21*       LOGICAL FUNCTION DISNAN( DIN )
22*
23*       .. Scalar Arguments ..
24*       DOUBLE PRECISION   DIN
25*       ..
26*
27*
28*> \par Purpose:
29*  =============
30*>
31*> \verbatim
32*>
33*> DISNAN returns .TRUE. if its argument is NaN, and .FALSE.
34*> otherwise.  To be replaced by the Fortran 2003 intrinsic in the
35*> future.
36*> \endverbatim
37*
38*  Arguments:
39*  ==========
40*
41*> \param[in] DIN
42*> \verbatim
43*>          DIN is DOUBLE PRECISION
44*>          Input to test for NaN.
45*> \endverbatim
46*
47*  Authors:
48*  ========
49*
50*> \author Univ. of Tennessee
51*> \author Univ. of California Berkeley
52*> \author Univ. of Colorado Denver
53*> \author NAG Ltd.
54*
55*> \date September 2012
56*
57*> \ingroup auxOTHERauxiliary
58*
59*  =====================================================================
60      LOGICAL FUNCTION DISNAN( DIN )
61*
62*  -- LAPACK auxiliary routine (version 3.4.2) --
63*  -- LAPACK is a software package provided by Univ. of Tennessee,    --
64*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
65*     September 2012
66*
67*     .. Scalar Arguments ..
68      DOUBLE PRECISION   DIN
69*     ..
70*
71*  =====================================================================
72*
73*  .. External Functions ..
74      LOGICAL DLAISNAN
75      EXTERNAL DLAISNAN
76*  ..
77*  .. Executable Statements ..
78      DISNAN = DLAISNAN(DIN,DIN)
79      RETURN
80      END
81