# swap¶

Swaps a vector with another vector.

Description

Given two vectors of n elements, x and y, the swap routines return vectors y and x swapped, each replacing the other.

$\begin{split}\left[\begin{array}{c} y\\x \end{array}\right] \leftarrow \left[\begin{array}{c} x\\y \end{array}\right]\end{split}$

swap supports the following precisions.

T

float

double

std::complex<float>

std::complex<double>

## swap (Buffer Version)¶

Syntax

namespace oneapi::mkl::blas::column_major {
void swap(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)
}

namespace oneapi::mkl::blas::row_major {
void swap(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)
}


Input Parameters

queue

The queue where the routine should be executed.

n

Number of elements in vector x.

x

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

incy

Stride of vector y.

Output Parameters

x

Buffer holding updated buffer x, that is, the input vector y.

y

Buffer holding updated buffer y, that is, the input vector x.

## swap (USM Version)¶

Syntax

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

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


Input Parameters

queue

The queue where the routine should be executed.

n

Number of elements in vector x.

x

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

incx

Stride of vector x.

y

Pointer to the input vector y. The array must be of size at least (1 + (n - 1)*abs(incy)). See 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.

Output Parameters

x

Pointer to the updated array x, that is, the input vector y.

y

Pointer to the updated array y, that is, the input vector x.

Return Values

Output event to wait on to ensure computation is complete.

Parent topic: BLAS Level 1 Routines