zlartg.f (3)  Linux Manuals
NAME
zlartg.f 
SYNOPSIS
Functions/Subroutines
subroutine zlartg (F, G, CS, SN, R)
ZLARTG generates a plane rotation with real cosine and complex sine.
Function/Subroutine Documentation
subroutine zlartg (complex*16F, complex*16G, double precisionCS, complex*16SN, complex*16R)
ZLARTG generates a plane rotation with real cosine and complex sine.
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.
Parameters:

F
F is COMPLEX*16 The first component of vector to be rotated.
GG is COMPLEX*16 The second component of vector to be rotated.
CSCS is DOUBLE PRECISION The cosine of the rotation.
SNSN is COMPLEX*16 The sine of the rotation.
RR is COMPLEX*16 The nonzero component of the rotated vector.
Author:

Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
 September 2012
Further Details:

3596  Modified with a new algorithm by W. Kahan and J. Demmel This version has a few statements commented out for thread safety (machine parameters are computed on each entry). 10 feb 03, SJH.
Definition at line 104 of file zlartg.f.
Author
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