slartgp.f (3)  Linux Man Pages
NAME
slartgp.f 
SYNOPSIS
Functions/Subroutines
subroutine slartgp (F, G, CS, SN, R)
SLARTGP generates a plane rotation so that the diagonal is nonnegative.
Function/Subroutine Documentation
subroutine slartgp (realF, realG, realCS, realSN, realR)
SLARTGP generates a plane rotation so that the diagonal is nonnegative.
Purpose:

SLARTGP generates 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 Level 1 BLAS 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. The sign is chosen so that R >= 0.
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 96 of file slartgp.f.
Author
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