zlartg.f(3)

NAME
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

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