dsdot
dsdot - compute the double precision dot product of two single precision
vectors x and y.
DOUBLE PRECISION FUNCTION DSDOT( N, X, INCX, Y, INCY)
INTEGER N, INCX, INCY
REAL X(*), Y(*)
DOUBLE PRECISION FUNCTION DSDOT_64( N, X, INCX, Y, INCY)
INTEGER*8 N, INCX, INCY
REAL X(*), Y(*)
REAL(8) FUNCTION DSDOT( [N], X, [INCX], Y, [INCY])
INTEGER :: N, INCX, INCY
REAL, DIMENSION(:) :: X, Y
REAL(8) FUNCTION DSDOT_64( [N], X, [INCX], Y, [INCY])
INTEGER(8) :: N, INCX, INCY
REAL, DIMENSION(:) :: X, Y
#include <sunperf.h>
double dsdot(int n, float *x, int incx, float *y, int incy);
double dsdot_64(long n, float *x, long incx, float *y, long incy);
dsdot compute the double precision dot product of x and y where x and y are single precision n-vectors.
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* 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. INCX must not be zero.
Unchanged on exit.
-
* Y (input)
-
( 1 + ( m - 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. INCY must not be zero.
Unchanged on exit.