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NAME
     zlartg - generate a plane rotation so that   [ CS SN ] [ F ]
     [ R ]  [ __ ]

SYNOPSIS
     SUBROUTINE ZLARTG( F, G, CS, SN, R )

     DOUBLE PRECISION CS

     COMPLEX*16 F, G, R, SN



     #include <sunperf.h>

     void zlartg(doublecomplex *f, doublecomplex *g, double  *cs,
               doublecomplex *sn, doublecomplex *r) ;

PURPOSE
     ZLARTG generates a plane rotation so that
        [ -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 and (G .ne. 0), then CS=0 and SN=1  without  doing
     any
           floating point operations.


ARGUMENTS
     F         (input) COMPLEX*16
               The first component of vector to be rotated.

     G         (input) COMPLEX*16
               The second component of vector to be rotated.

     CS        (output) DOUBLE PRECISION
               The cosine of the rotation.

     SN        (output) COMPLEX*16
               The sine of the rotation.

     R         (output) COMPLEX*16
               The nonzero component of the rotated vector.

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