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);

Description

Oracle Solaris Studio 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.




                                  7 Nov 2015                          ddot(3P)