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NAME
     zrotg - Construct a Given's plane rotation

SYNOPSIS
     SUBROUTINE ZROTG (A, B, C, S)

     COMPLEX*16    A, B, S DOUBLE PRECISION       C



     #include <sunperf.h>

     void zrotg(doublecomplex *ca, doublecomplex *cb, double * c,
               doublecomplex *s) ;

PURPOSE
     ZROTG - Construct a Given's plane rotation that will annihi-
     late an element of a vector.


PARAMETERS
     A         - COMPLEX*16.
               On entry, A contains the entry in the first vector
               that  corresponds to the element to be annihilated
               in the second vector.  Unchanged on exit.

     B         - COMPLEX*16.
               On entry, B contains the entry to  be  annihilated
               in the second vector.

     C         - DOUBLE PRECISION.
               On exit, C and S are the elements of the  rotation
               matrix that will be applied to annihilate B.

     S         - COMPLEX*16.
               On exit, C and S are the elements of the  rotation
               matrix that will be applied to annihilate B.

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