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)
Check Out this Related Man Page
dlartgp.f(3) LAPACK dlartgp.f(3)NAME
dlartgp.f -
SYNOPSIS
Functions/Subroutines
subroutine dlartgp (F, G, CS, SN, R)
DLARTGP generates a plane rotation so that the diagonal is nonnegative.
Function/Subroutine Documentation
subroutine dlartgp (double precisionF, double precisionG, double precisionCS, double precisionSN, double precisionR)
DLARTGP generates a plane rotation so that the diagonal is nonnegative.
Purpose:
DLARTGP generates a plane rotation so that
[ CS SN ] . [ F ] = [ R ] where CS**2 + SN**2 = 1.
[ -SN CS ] [ G ] [ 0 ]
This is a slower, more accurate version of the Level 1 BLAS routine DROTG,
with the following other differences:
F and G are unchanged on return.
If G=0, then CS=(+/-)1 and SN=0.
If F=0 and (G .ne. 0), then CS=0 and SN=(+/-)1.
The sign is chosen so that R >= 0.
Parameters:
F
F is DOUBLE PRECISION
The first component of vector to be rotated.
G
G is DOUBLE PRECISION
The second component of vector to be rotated.
CS
CS is DOUBLE PRECISION
The cosine of the rotation.
SN
SN is DOUBLE PRECISION
The sine of the rotation.
R
R is DOUBLE PRECISION
The nonzero component of the rotated vector.
This version has a few statements commented out for thread safety
(machine parameters are computed on each entry). 10 feb 03, SJH.
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
September 2012
Definition at line 96 of file dlartgp.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.2 Tue Sep 25 2012 dlartgp.f(3)
Hi guys
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in cmp2 ,the content is :
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File:-
{
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