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

slartg(l)


SLARTG

SLARTG

NAME
SYNOPSIS
PURPOSE
ARGUMENTS

NAME

SLARTG - generate a plane rotation so that [ CS SN ]

SYNOPSIS

SUBROUTINE SLARTG(

F, G, CS, SN, R )

REAL

CS, F, G, R, SN

PURPOSE

SLARTG generate a plane rotation so that [ CS SN ] . [ F ] = [ R ] where CS**2 + SN**2 = 1. [ -SN CS ] [ G ] [ 0 ]

This is a slower, more accurate version of the BLAS1 routine SROTG, with the following other differences:
F and G are unchanged on return.
If G=0, then CS=1 and SN=0.
If F=0 and (G .ne. 0), then CS=0 and SN=1 without doing any
floating point operations (saves work in SBDSQR when
there are zeros on the diagonal).

If F exceeds G in magnitude, CS will be positive.

ARGUMENTS

F (input) REAL

The first component of vector to be rotated.

G (input) REAL

The second component of vector to be rotated.

CS (output) REAL

The cosine of the rotation.

SN (output) REAL

The sine of the rotation.

R (output) REAL

The nonzero component of the rotated vector.



slartg(l)