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 zlartg.f(3) LAPACK zlartg.f(3)

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
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

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 Sat Nov 16 2013 Version 3.4.2

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