zlartg.f man page

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.

G

G is COMPLEX*16
The second component of vector to be rotated.

CS

CS is DOUBLE PRECISION
The cosine of the rotation.

SN

SN is COMPLEX*16
The sine of the rotation.

R

R 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:

November 2013

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.

Definition at line 104 of file zlartg.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.

Referenced By

zlartg(3) is an alias of zlartg.f(3).

Sat Nov 16 2013 Version 3.4.2 LAPACK