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NAME
     drotg - Construct a Given's plane rotation

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

     DOUBLE PRECISION    A, B, C, S



     #include <sunperf.h>

     void drotg(double *da, double *db, double *dc, double *s) ;

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


PARAMETERS
     A         - DOUBLE PRECISION.
               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         - DOUBLE PRECISION.
               On entry, B contains the entry to  be  annihilated
               in the second vector.  Unchanged on exit.

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

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