LAPACK  3.4.2 LAPACK: Linear Algebra PACKage
zlartg.f File Reference

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## 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*16 F, complex*16 G, double precision CS, complex*16 SN, complex*16 R )

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:
 [in] F ``` F is COMPLEX*16 The first component of vector to be rotated.``` [in] G ``` G is COMPLEX*16 The second component of vector to be rotated.``` [out] CS ``` CS is DOUBLE PRECISION The cosine of the rotation.``` [out] SN ``` SN is COMPLEX*16 The sine of the rotation.``` [out] R ``` R is COMPLEX*16 The nonzero component of the rotated vector.```
Date:
September 2012
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.

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