Scroll to navigation

CLARTG(1) LAPACK auxiliary routine (version 3.2) CLARTG(1)

NAME

CLARTG - generates a plane rotation so that [ CS SN ] [ F ] [ R ] [ __ ]

SYNOPSIS

F, G, CS, SN, R )

REAL CS COMPLEX F, G, R, SN

PURPOSE

CLARTG generates a plane rotation so that
[ -SN CS ] [ G ] [ 0 ]
This is a faster version of the BLAS1 routine CROTG, 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.

ARGUMENTS

The first component of vector to be rotated.
The second component of vector to be rotated.
The cosine of the rotation.
The sine of the rotation.
The nonzero component of the rotated vector.

FURTHER DETAILS

3-5-96 - 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.

November 2008 LAPACK auxiliary routine (version 3.2)