.. _onemkl_blas_dot: dot === Computes the dot product of two real vectors. .. _onemkl_blas_dot_description: .. rubric:: Description The dot routines perform a dot product between two vectors: .. math:: result = \sum_{i=1}^{n}X_iY_i dot supports the following precisions for data. .. list-table:: :header-rows: 1 * - T - T_res * - float - float * - double - double * - float - double .. container:: Note .. rubric:: Note :class: NoteTipHead For the mixed precision version (inputs are float while result is double), the dot product is computed with double precision. .. _onemkl_blas_dot_buffer: dot (Buffer Version) -------------------- .. rubric:: Syntax .. code-block:: cpp namespace oneapi::mkl::blas::column_major { void dot(sycl::queue &queue, std::int64_t n, sycl::buffer &x, std::int64_t incx, sycl::buffer &y, std::int64_t incy, sycl::buffer &result) } .. code-block:: cpp namespace oneapi::mkl::blas::row_major { void dot(sycl::queue &queue, std::int64_t n, sycl::buffer &x, std::int64_t incx, sycl::buffer &y, std::int64_t incy, sycl::buffer &result) } .. container:: section .. rubric:: Input Parameters queue The queue where the routine should be executed. n Number of elements in vectors x and y. x Buffer holding input vector x. The buffer must be of size at least (1 + (n – 1)*abs(incx)). See :ref:matrix-storage for more details. incx Stride of vector x. y Buffer holding input vector y. The buffer must be of size at least (1 + (n – 1)*abs(incy)). See :ref:matrix-storage for more details. incy Stride of vector y. .. container:: section .. rubric:: Output Parameters result Buffer where the result (a scalar) will be stored. .. _onemkl_blas_dot_usm: dot (USM Version) ----------------- .. rubric:: Syntax .. code-block:: cpp namespace oneapi::mkl::blas::column_major { sycl::event dot(sycl::queue &queue, std::int64_t n, const T *x, std::int64_t incx, const T *y, std::int64_t incy, T_res *result, const std::vector &dependencies = {}) } .. code-block:: cpp namespace oneapi::mkl::blas::row_major { sycl::event dot(sycl::queue &queue, std::int64_t n, const T *x, std::int64_t incx, const T *y, std::int64_t incy, T_res *result, const std::vector &dependencies = {}) } .. container:: section .. rubric:: Input Parameters queue The queue where the routine should be executed. n Number of elements in vectors x and y. x Pointer to the input vector x. The array holding the vector x must be of size at least (1 + (n – 1)*abs(incx)). See :ref:matrix-storage for more details. incx Stride of vector x. y Pointer to the input vector y. The array holding the vector y must be of size at least (1 + (n – 1)*abs(incy)). See :ref:matrix-storage for more details. incy Stride of vector y. dependencies List of events to wait for before starting computation, if any. If omitted, defaults to no dependencies. .. container:: section .. rubric:: Output Parameters result Pointer to where the result (a scalar) will be stored. .. container:: section .. rubric:: Return Values Output event to wait on to ensure computation is complete. **Parent topic:** :ref:blas-level-1-routines