redhat man page for zlartg

ZLARTG(l)								 )								 ZLARTG(l)

NAME
       ZLARTG - generate a plane rotation so that  [ CS SN ] [ F ] [ R ] [ __ ]

SYNOPSIS
       SUBROUTINE ZLARTG( F, G, CS, SN, R )

	   DOUBLE	  PRECISION CS

	   COMPLEX*16	  F, G, R, SN

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.

ARGUMENTS
       F       (input) COMPLEX*16
	       The first component of vector to be rotated.

       G       (input) COMPLEX*16
	       The second component of vector to be rotated.

       CS      (output) DOUBLE PRECISION
	       The cosine of the rotation.

       SN      (output) COMPLEX*16
	       The sine of the rotation.

       R       (output) COMPLEX*16
	       The nonzero component of the rotated vector.

FURTHER DETAILS
       3-5-96 - Modified with a new algorithm by W. Kahan and J. Demmel

LAPACK version 3.0						   15 June 2000 							 ZLARTG(l)