LAPACK  3.9.1
LAPACK: Linear Algebra PACKage
disnan.f
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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
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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
logical function disnan(DIN)
DISNAN tests input for NaN.
Definition: disnan.f:59
logical function dlaisnan(DIN1, DIN2)
DLAISNAN tests input for NaN by comparing two arguments for inequality.
Definition: dlaisnan.f:74