comparing with numbers. Post: 302341127

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LEARN ABOUT CENTOS

dlaisnan.f

dlaisnan.f(3)							      LAPACK							     dlaisnan.f(3)

NAME

       dlaisnan.f -

SYNOPSIS

   Functions/Subroutines
       LOGICAL function dlaisnan (DIN1, DIN2)
	   DLAISNAN tests input for NaN by comparing two arguments for inequality.

Function/Subroutine Documentation
   LOGICAL function dlaisnan (double precisionDIN1, double precisionDIN2)
       DLAISNAN tests input for NaN by comparing two arguments for inequality.

       Purpose:

	    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.

       Parameters:
	   DIN1

		     DIN1 is DOUBLE PRECISION

	   DIN2

		     DIN2 is DOUBLE PRECISION
		     Two numbers to compare for inequality.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   September 2012

       Definition at line 75 of file dlaisnan.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2							  Tue Sep 25 2012						     dlaisnan.f(3)

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