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ddot(3P)		    Sun Performance Library		      ddot(3P)

NAME
       ddot - compute the dot product of two vectors x and y.

SYNOPSIS
       DOUBLE PRECISION FUNCTION DDOT(N, X, INCX, Y, INCY)

       INTEGER N, INCX, INCY
       DOUBLE PRECISION X(*), Y(*)

       DOUBLE PRECISION FUNCTION DDOT_64(N, X, INCX, Y, INCY)

       INTEGER*8 N, INCX, INCY
       DOUBLE PRECISION X(*), Y(*)

   F95 INTERFACE
       REAL(8) FUNCTION DOT([N], X, [INCX], Y, [INCY])

       INTEGER :: N, INCX, INCY
       REAL(8), DIMENSION(:) :: X, Y

       REAL(8) FUNCTION DOT_64([N], X, [INCX], Y, [INCY])

       INTEGER(8) :: N, INCX, INCY
       REAL(8), DIMENSION(:) :: X, Y

   C INTERFACE
       #include <sunperf.h>

       double ddot(int n, double *x, int incx, double *y, int incy);

       double ddot_64(long n, double *x, long incx, double *y, long incy);

PURPOSE
       ddot compute the dot product of x and y where x and y are n-vectors.

ARGUMENTS
       N (input)
		 On  entry,  N specifies the number of elements in the vector.
		 If N is not positive then the function returns the value 0.0.
		 Unchanged on exit.

       X (input)
		 (  1  +  (  n - 1 )*abs( INCX ) ).  On entry, the incremented
		 array X must contain the vector x.  Unchanged on exit.

       INCX (input)
		 On entry, INCX specifies the increment for the elements of X.
		 Unchanged on exit.

       Y (input)
		 (  1  +  (  n - 1 )*abs( INCY ) ).  On entry, the incremented
		 array Y must contain the vector y.  Unchanged on exit.

       INCY (input)
		 On entry, INCY specifies the increment for the elements of Y.
		 Unchanged on exit.

				  6 Mar 2009			      ddot(3P)

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