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