subroutine clartg (F, G, CS, SN, R)
CLARTG generates a plane rotation with real cosine and complex sine.
CLARTG generates a plane rotation with real cosine and complex sine.
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 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 California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
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 105 of file clartg.f.
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