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, INTENT(IN) :: 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*> \ingroup OTHERauxiliary
56*
57*  =====================================================================
58      LOGICAL FUNCTION DISNAN( DIN )
59*
60*  -- LAPACK auxiliary routine --
61*  -- LAPACK is a software package provided by Univ. of Tennessee,    --
62*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
63*
64*     .. Scalar Arguments ..
65      DOUBLE PRECISION, INTENT(IN) :: DIN
66*     ..
67*
68*  =====================================================================
69*
70*  .. External Functions ..
71      LOGICAL DLAISNAN
72      EXTERNAL DLAISNAN
73*  ..
74*  .. Executable Statements ..
75      DISNAN = DLAISNAN(DIN,DIN)
76      RETURN
77      END
78