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NAME
     zdotu - Compute the dot product of two vectors x and y.

SYNOPSIS
     COMPLEX*16 FUNCTION ZDOTU (N, X, INCY, Y, INCY )

     INTEGER INCX, INCY, N

     COMPLEX*16    X( * ), Y( * )

PURPOSE
     ZDOTU - Compute the dot product of x and y where x and y are
     n-vectors.
     #include <sunperf.h>

     doublecomplex *zdotu(int n,  doublecomplex  *cx,  int  incx,
               doublecomplex *cy, int incy);


PARAMETERS
     N         - INTEGER.
               On entry, N specifies the number  of  elements  in
               the  vector.   If N is not positive then the func-
               tion returns the value 0.0.  Unchanged on exit.

     X         - COMPLEX*16 array of DIMENSION at least
               ( 1 + ( n - 1 )*abs( INCX  )  ).   On  entry,  the
               incremented array X must contain the vector x.  On
               exit, the y vector.

     INCX      - INTEGER.
               On entry, INCX specifies  the  increment  for  the
               elements  of  X. INCX must not be zero.  Unchanged
               on exit.

     Y         - COMPLEX*16 array of DIMENSION at least
               ( 1 + ( m - 1 )*abs( INCY  )  ).   On  entry,  the
               incremented  array  Y  must  contain the vector y.
               Unchanged on exit.

     INCY      - INTEGER.
               On entry, INCY specifies  the  increment  for  the
               elements  of  Y. INCY must not be zero.  Unchanged
               on exit.

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