Contents

# 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. The operation is defined as:
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 vectors
x
and
y
.
x
Buffer holding input vector
x
. Size of the buffer must be 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
. Size of the buffer must be at least (1 + (
n
- 1)*abs(
incy
)). See ref:
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 vectors
x
and
y
.
x
Pointer to input vector
x
. Size of the array must be at least (1 + (
n
- 1)*abs(
incx
)). See ref:
matrix-storage
for more details.
incx
Stride of vector
x
.
y
Pointer to input vector
y
. Size of the array must be 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.
Output Parameters
x
Pointer to updated array
x
, that is, the input vector
y
.
y
Pointer to updated array
y
, that is, the input vector
x
.
Return Values
Output event to wait on to ensure computation is complete.

#### Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.