Scroll to navigation

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.
Wed Oct 15 2014 Version 3.4.2