#include "ESMF_LapackBlas.inc" !> \brief \b DLAISNAN ! ! =========== 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 November 2011 ! !> \ingroup auxOTHERauxiliary ! ! ===================================================================== LOGICAL FUNCTION DLAISNAN( DIN1, DIN2 ) ! ! -- LAPACK auxiliary routine (version 3.4.0) -- ! -- LAPACK is a software package provided by Univ. of Tennessee, -- ! -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- ! November 2011 ! ! .. Scalar Arguments .. DOUBLE PRECISION DIN1, DIN2 ! .. ! ! ===================================================================== ! ! .. Executable Statements .. DLAISNAN = (DIN1.NE.DIN2) RETURN END