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dotc

Computes the dot product of two complex vectors, conjugating the first vector.

Description

The dotc routines perform a dot product between two complex vectors, conjugating the first one. The operation is defined as:

\mathrm{result} = \sum_{i=1}^n \overline{X_i} Y_i

dotc supports the following precisions:

T

std::complex<float>

std::complex<double>

dotc (Buffer Version)

Syntax

namespace oneapi::mkl::blas::column_major {
    void dotc(sycl::queue &queue,
              std::int64_t n,
              sycl::buffer<T,1> &x,
              std::int64_t incx,
              sycl::buffer<T,1> &y,
              std::int64_t incy,
              sycl::buffer<T,1> &result)
}

namespace oneapi::mkl::blas::row_major {
    void dotc(sycl::queue &queue,
              std::int64_t n,
              sycl::buffer<T,1> &x,
              std::int64_t incx,
              sycl::buffer<T,1> &y,
              std::int64_t incy,
              sycl::buffer<T,1> &result)
}

Input Parameters

queue

The queue where the routine should be executed.

n

The number of elements in vectors x and y.

x

Buffer holding input vector x. Size of the buffer must be at least (1 + (n - 1)*abs(incx)). See Matrix Storage for more details.

incx

The stride of vector x.

y

Buffer holding input vector y. Size of the buffer must be at least (1 + (n - 1)*abs(incy)). See Matrix Storage for more details.

incy

The stride of vector y.

Output Parameters

result

The buffer where the result (a scalar) is stored.

dotc (USM Version)

Syntax

namespace oneapi::mkl::blas::column_major {
    sycl::event dotc(sycl::queue &queue,
                     std::int64_t n,
                     const T *x,
                     std::int64_t incx,
                     const T *y,
                     std::int64_t incy,
                     T *result,
                     const std::vector<sycl::event> &dependencies = {})
}

namespace oneapi::mkl::blas::row_major {
    sycl::event dotc(sycl::queue &queue,
                     std::int64_t n,
                     const T *x,
                     std::int64_t incx,
                     const T *y,
                     std::int64_t incy,
                     T *result,
                     const std::vector<sycl::event> &dependencies = {})
}

Input Parameters

queue

The queue where the routine should be executed.

n

The number of elements in vectors x and y.

x

Pointer to input vector x. Size of the array holding input vector x must be at least (1 + (n - 1)*abs(incx)). See Matrix Storage for more details.

incx

The stride of vector x.

y

Pointer to input vector y. Size of the array holding input vector y must be at least (1 + (n - 1)*abs(incy)). See Matrix Storage for more details.

incy

The stride of vector y.

dependencies

List of events to wait for before starting computation, if any. If omitted, defaults to no dependencies.

Output Parameters

result

The pointer to where the result (a scalar) is stored.

Return Values

Output event to wait on to ensure computation is complete.

dot dotu