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rotm
Performs modified Givens rotation of points in the plane.
Description
Given two vectors x and y, each vector element of these vectors is replaced as follows:
for i from 1 to n, where H is a modified Givens transformation matrix.
rotm supports the following precisions:
T |
|---|
float |
double |
rotm (Buffer Version)
Syntax
namespace oneapi::mkl::blas::column_major {
void rotm(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> ¶m)
}namespace oneapi::mkl::blas::row_major {
void rotm(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> ¶m)
}Input Parameters
- queue
-
The queue where the routine should be executed.
- n
-
Number of elements in vector x.
- 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
-
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
-
Stride of vector y.
- param
-
Buffer holding an array of size 5. The elements of the param array are:
param[0] contains a switch, flag. The other array elements param[1-4] contain the components of the modified Givens transformation matrix H: h11, h21, h12, and h22, respectively.
Depending on the values of flag, the components of H are set as follows:
flag = -1.0:
flag = 0.0:
flag = 1.0:
flag = -2.0:
In the last three cases, the matrix entries of 1.0, -1.0, 0.0 are assumed based on the value of flag and are not required to be set in the param vector.
Output Parameters
- x
-
Buffer holding updated buffer x.
- y
-
Buffer holding updated buffer y.
rotm (USM Version)
Syntax
namespace oneapi::mkl::blas::column_major {
sycl::event rotm(sycl::queue &queue,
std::int64_t n,
T *x,
std::int64_t incx,
T *y,
std::int64_t incy,
const T *param,
const std::vector<sycl::event> &dependencies = {})
}namespace oneapi::mkl::blas::row_major {
sycl::event rotm(sycl::queue &queue,
std::int64_t n,
T *x,
std::int64_t incx,
T *y,
std::int64_t incy,
const T *param,
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. Size of the array holding vector x must be at least (1 + (n - 1)*abs(incx)). See Matrix Storage for more details.
- incx
-
Stride of vector x.
- yparam
-
Pointer to the input vector y. Size of the array holding vector y must be at least (1 + (n - 1)*abs(incy)). See Matrix Storage for more details.
- incy
-
Stride of vector y.
- param
-
Pointer to an array of size 5. The elements of the param array are:
param[0] contains a switch, flag. The other array elements param[1-4] contain the components of the modified Givens transformation matrix H: h11, h21, h12, and h22, respectively.
Depending on the values of flag, the components of H are set as follows:
flag = -1.0:
flag = 0.0:
flag = 1.0:
flag = -2.0:
In the last three cases, the matrix entries of 1.0, -1.0, 0.0 are assumed based on the value of flag and are not required to be set in the param vector.
- 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.
- y
-
Pointer to updated array y.
Return Values
Output event to wait on to ensure computation is complete.