Visible to Intel only — GUID: GUID-93DA36DC-40CA-4C01-B883-DABAB0D378D4
Visible to Intel only — GUID: GUID-93DA36DC-40CA-4C01-B883-DABAB0D378D4
?dot
Computes a vector-vector dot product.
Syntax
res = sdot(n, x, incx, y, incy)
res = ddot(n, x, incx, y, incy)
res = dot(x, y)
Include Files
- mkl.fi, blas.f90
Description
The ?dot routines perform a vector-vector reduction operation defined as
where xi and yi are elements of vectors x and y.
Input Parameters
- n
-
INTEGER. Specifies the number of elements in vectors x and y.
- x
-
REAL for sdot
DOUBLE PRECISION for ddot
Array, size at least (1+(n-1)*abs(incx)).
- incx
-
INTEGER. Specifies the increment for the elements of x.
- y
-
REAL for sdot
DOUBLE PRECISION for ddot
Array, size at least (1+(n-1)*abs(incy)).
- incy
-
INTEGER. Specifies the increment for the elements of y.
Output Parameters
- res
-
REAL for sdot
DOUBLE PRECISION for ddot
Contains the result of the dot product of x and y, if n is positive. Otherwise, res contains 0.
BLAS 95 Interface Notes
Routines in Fortran 95 interface have fewer arguments in the calling sequence than their FORTRAN 77 counterparts. For general conventions applied to skip redundant or reconstructible arguments, see BLAS 95 Interface Conventions.
Specific details for the routine dot interface are the following:
- x
-
Holds the vector with the number of elements n.
- y
-
Holds the vector with the number of elements n.