slartg.f (3)  Linux Man Pages
NAME
slartg.f 
SYNOPSIS
Functions/Subroutines
subroutine slartg (F, G, CS, SN, R)
SLARTG generates a plane rotation with real cosine and real sine.
Function/Subroutine Documentation
subroutine slartg (realF, realG, realCS, realSN, realR)
SLARTG generates a plane rotation with real cosine and real sine.
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.
Parameters:

F
F is REAL The first component of vector to be rotated.
GG is REAL The second component of vector to be rotated.
CSCS is REAL The cosine of the rotation.
SNSN is REAL The sine of the rotation.
RR is REAL The nonzero component of the rotated vector. This version has a few statements commented out for thread safety (machine parameters are computed on each entry). 10 feb 03, SJH.
Author:

Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
 September 2012
Definition at line 98 of file slartg.f.
Author
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