dlartgp.f (3)  Linux Manuals
NAME
dlartgp.f 
SYNOPSIS
Functions/Subroutines
subroutine dlartgp (F, G, CS, SN, R)
DLARTGP generates a plane rotation so that the diagonal is nonnegative.
Function/Subroutine Documentation
subroutine dlartgp (double precisionF, double precisionG, double precisionCS, double precisionSN, double precisionR)
DLARTGP generates a plane rotation so that the diagonal is nonnegative.
Purpose:

DLARTGP 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 DROTG, 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 DOUBLE PRECISION The first component of vector to be rotated.
GG is DOUBLE PRECISION The second component of vector to be rotated.
CSCS is DOUBLE PRECISION The cosine of the rotation.
SNSN is DOUBLE PRECISION The sine of the rotation.
RR is DOUBLE PRECISION 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 dlartgp.f.
Author
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