# 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