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

zlartg.f -


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

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.

Generated automatically by Doxygen for LAPACK from the source code.
Sat Nov 16 2013 Version 3.4.2

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