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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
   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