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CentOS 7.0 - man page for slaisnan (centos section 3)

slaisnan.f(3)							      LAPACK							     slaisnan.f(3)

NAME
slaisnan.f -
SYNOPSIS
Functions/Subroutines LOGICAL function slaisnan (SIN1, SIN2) SLAISNAN tests input for NaN by comparing two arguments for inequality. Function/Subroutine Documentation LOGICAL function slaisnan (realSIN1, realSIN2) SLAISNAN 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 SISNAN. SLAISNAN 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: SIN1 SIN1 is REAL SIN2 SIN2 is REAL 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 slaisnan.f. Author Generated automatically by Doxygen for LAPACK from the source code. Version 3.4.2 Tue Sep 25 2012 slaisnan.f(3)
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