# rot¶

Performs rotation of points in the plane.

Description

Given two vectors x and y of n elements, the rot routines compute four scalar-vector products and update the input vectors with the sum of two of these scalar-vector products as follow:

$\begin{split}\left[\begin{array}{c} x\\y \end{array}\right] \leftarrow \left[\begin{array}{c} \phantom{-}c*x + s*y\\ -s*x + c*y \end{array}\right]\end{split}$

rot supports the following precisions.

T

T_scalar

float

float

double

double

std::complex<float>

float

std::complex<double>

double

## rot (Buffer Version)¶

Syntax

namespace oneapi::mkl::blas::column_major {
void rot(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,
T_scalar c,
T_scalar s)
}

namespace oneapi::mkl::blas::row_major {
void rot(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,
T_scalar c,
T_scalar s)
}


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.

c

Scaling factor.

s

Scaling factor.

Output Parameters

x

Buffer holding updated buffer x.

y

Buffer holding updated buffer y.

## rot (USM Version)¶

Syntax

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

namespace oneapi::mkl::blas::row_major {
sycl::event rot(sycl::queue &queue,
std::int64_t n,
T *x,
std::int64_t incx,
T *y,
std::int64_t incy,
T_scalar c,
T_scalar s,
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 input vector x. The array holding input vector x 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 input vector y. The array holding input vector y must be of size at least (1 + (n - 1)*abs(incy)). See Matrix Storage for more details.

incy

Stride of vector y.

c

Scaling factor.

s

Scaling factor.

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 matrix x.

y

Pointer to the updated matrix y.

Return Values

Output event to wait on to ensure computation is complete.

Parent topic: BLAS Level 1 Routines