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

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## Functions/Subroutines

subroutine clartg (F, G, CS, SN, R)
CLARTG generates a plane rotation with real cosine and complex sine.

## Function/Subroutine Documentation

 subroutine clartg ( complex F, complex G, real CS, complex SN, complex R )

CLARTG generates a plane rotation with real cosine and complex sine.

Download CLARTG + dependencies [TGZ] [ZIP] [TXT]
Purpose:
``` CLARTG 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 CROTG, 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 The first component of vector to be rotated.``` [in] G ``` G is COMPLEX The second component of vector to be rotated.``` [out] CS ``` CS is REAL The cosine of the rotation.``` [out] SN ``` SN is COMPLEX The sine of the rotation.``` [out] R ``` R is COMPLEX 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 clartg.f.

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