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
   [ -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 and (G .ne. 0), then CS=0 and SN=1 without doing any
      floating point operations.
 

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.

SunSoft, Inc.  —  Last change: 27 Jun 1995