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.TH CLARTG l "15 June 2000" "LAPACK version 3.0" ")"
.SH NAME
CLARTG - generate a plane rotation so that [ CS SN ] [ F ] [ R ] [ __ ]
.SH SYNOPSIS
.TP 19
SUBROUTINE CLARTG(
F, G, CS, SN, R )
.TP 19
.ti +4
REAL
CS
.TP 19
.ti +4
COMPLEX
F, G, R, SN
.SH PURPOSE
CLARTG generates a plane rotation so that [ CS SN ] [ F ] [ R ] [ __ ] . [ ] = [ ] where CS**2 + |SN|**2 = 1. [ -SN CS ] [ G ] [ 0 ]
.br
This is a faster version of the BLAS1 routine CROTG, except for
the following differences:
.br
F and G are unchanged on return.
.br
If G=0, then CS=1 and SN=0.
.br
If F=0, then CS=0 and SN is chosen so that R is real.
.br
.SH ARGUMENTS
.TP 8
F (input) COMPLEX
The first component of vector to be rotated.
.TP 8
G (input) COMPLEX
The second component of vector to be rotated.
.TP 8
CS (output) REAL
The cosine of the rotation.
.TP 8
SN (output) COMPLEX
The sine of the rotation.
.TP 8
R (output) COMPLEX
The nonzero component of the rotated vector.
.SH FURTHER DETAILS
3-5-96 - Modified with a new algorithm by W. Kahan and J. Demmel
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