Flashnux

GNU/Linux man pages

Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :

ISBN : 978-2-7460-9712-4
EAN : 9782746097124
(Editions ENI)

GNU/Linux

CentOS 4.8

 i386

zlartg(l)
ZLARTG

ZLARTG

NAME
SYNOPSIS
PURPOSE
ARGUMENTS
FURTHER DETAILS

NAME

ZLARTG - generate a plane rotation so that [ CS SN ] [ F ] [ R ] [ __ ]

SYNOPSIS

SUBROUTINE ZLARTG(

F, G, CS, SN, R )

DOUBLE

PRECISION CS

COMPLEX*16

F, G, R, SN

PURPOSE

ZLARTG 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 ZROTG, 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*16

The first component of vector to be rotated.

G (input) COMPLEX*16

The second component of vector to be rotated.

CS (output) DOUBLE PRECISION

The cosine of the rotation.

SN (output) COMPLEX*16

The sine of the rotation.

R (output) COMPLEX*16

The nonzero component of the rotated vector.

FURTHER DETAILS

3-5-96 - Modified with a new algorithm by W. Kahan and J. Demmel

zlartg(l)