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[bytom/vapor.git] / vendor / gonum.org / v1 / gonum / lapack / internal / testdata / dlasqtest / dlaisnan.f

diff --git a/vendor/gonum.org/v1/gonum/lapack/internal/testdata/dlasqtest/dlaisnan.f b/vendor/gonum.org/v1/gonum/lapack/internal/testdata/dlasqtest/dlaisnan.f
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+*> \brief \b DLAISNAN tests input for NaN by comparing two arguments for inequality.
+*
+*  =========== DOCUMENTATION ===========
+*
+* Online html documentation available at 
+*            http://www.netlib.org/lapack/explore-html/ 
+*
+*> \htmlonly
+*> Download DLAISNAN + dependencies 
+*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dlaisnan.f"> 
+*> [TGZ]</a> 
+*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dlaisnan.f"> 
+*> [ZIP]</a> 
+*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dlaisnan.f"> 
+*> [TXT]</a>
+*> \endhtmlonly 
+*
+*  Definition:
+*  ===========
+*
+*       LOGICAL FUNCTION DLAISNAN( DIN1, DIN2 )
+* 
+*       .. Scalar Arguments ..
+*       DOUBLE PRECISION   DIN1, DIN2
+*       ..
+*  
+*
+*> \par Purpose:
+*  =============
+*>
+*> \verbatim
+*>
+*> This routine is not for general use.  It exists solely to avoid
+*> over-optimization in DISNAN.
+*>
+*> DLAISNAN checks for NaNs by comparing its two arguments for
+*> inequality.  NaN is the only floating-point value where NaN != NaN
+*> returns .TRUE.  To check for NaNs, pass the same variable as both
+*> arguments.
+*>
+*> A compiler must assume that the two arguments are
+*> not the same variable, and the test will not be optimized away.
+*> Interprocedural or whole-program optimization may delete this
+*> test.  The ISNAN functions will be replaced by the correct
+*> Fortran 03 intrinsic once the intrinsic is widely available.
+*> \endverbatim
+*
+*  Arguments:
+*  ==========
+*
+*> \param[in] DIN1
+*> \verbatim
+*>          DIN1 is DOUBLE PRECISION
+*> \endverbatim
+*>
+*> \param[in] DIN2
+*> \verbatim
+*>          DIN2 is DOUBLE PRECISION
+*>          Two numbers to compare for inequality.
+*> \endverbatim
+*
+*  Authors:
+*  ========
+*
+*> \author Univ. of Tennessee 
+*> \author Univ. of California Berkeley 
+*> \author Univ. of Colorado Denver 
+*> \author NAG Ltd. 
+*
+*> \date September 2012
+*
+*> \ingroup auxOTHERauxiliary
+*
+*  =====================================================================
+      LOGICAL FUNCTION DLAISNAN( DIN1, DIN2 )
+*
+*  -- 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   DIN1, DIN2
+*     ..
+*
+*  =====================================================================
+*
+*  .. Executable Statements ..
+      DLAISNAN = (DIN1.NE.DIN2)
+      RETURN
+      END