Rechercher une page de manuel
zlartg
Langue: en
Version: 321389 (ubuntu - 07/07/09)
Section: 3 (Bibliothèques de fonctions)
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. DemmelContenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre