CLARTG(l) ) CLARTG(l)
NAME
CLARTG - generate a plane rotation so that [ CS SN ] [ F ] [ R ] [ __ ]
SYNOPSIS
SUBROUTINE CLARTG( F, G, CS, SN, R )
REAL CS
COMPLEX F, G, R, SN
PURPOSE
CLARTG generates a plane rotation so that [ CS SN ] [ F ] [ R ] [ __ ] . [ ] = [ ] where CS**2 + |SN|**2 = 1. [ -SN CS ] [ G ]
[ 0 ]
This is a faster version of the BLAS1 routine CROTG, except for the following differences:
F and G are unchanged on return.
If G=0, then CS=1 and SN=0.
If F=0, then CS=0 and SN is chosen so that R is real.
ARGUMENTS
F (input) COMPLEX
The first component of vector to be rotated.
G (input) COMPLEX
The second component of vector to be rotated.
CS (output) REAL
The cosine of the rotation.
SN (output) COMPLEX
The sine of the rotation.
R (output) COMPLEX
The nonzero component of the rotated vector.
FURTHER DETAILS
3-5-96 - Modified with a new algorithm by W. Kahan and J. Demmel
LAPACK version 3.0 15 June 2000 CLARTG(l)
Check Out this Related Man Page
clartg.f(3) LAPACK clartg.f(3)NAME
clartg.f -
SYNOPSIS
Functions/Subroutines
subroutine clartg (F, G, CS, SN, R)
CLARTG
Function/Subroutine Documentation
subroutine clartg (complexF, complexG, realCS, complexSN, complexR)
CLARTG
Purpose:
CLARTG generates a plane rotation so that
[ CS SN ] [ F ] [ R ]
[ __ ] . [ ] = [ ] where CS**2 + |SN|**2 = 1.
[ -SN CS ] [ G ] [ 0 ]
This is a faster version of the BLAS1 routine CROTG, except for
the following differences:
F and G are unchanged on return.
If G=0, then CS=1 and SN=0.
If F=0, then CS=0 and SN is chosen so that R is real.
Parameters:
F
F is COMPLEX
The first component of vector to be rotated.
G
G is COMPLEX
The second component of vector to be rotated.
CS
CS is REAL
The cosine of the rotation.
SN
SN is COMPLEX
The sine of the rotation.
R
R is COMPLEX
The nonzero component of the rotated vector.
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
November 2011
Further Details:
3-5-96 - Modified with a new algorithm by W. Kahan and J. Demmel
This version has a few statements commented out for thread safety
(machine parameters are computed on each entry). 10 feb 03, SJH.
Definition at line 104 of file clartg.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.1 Sun May 26 2013 clartg.f(3)
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