rotg
Computes the parameters for a Givens rotation.
Description
Given the Cartesian coordinates
(a, b)
of a point, the rotg
routines return the parameters c
, s
, r
, and z
associated with the Givens rotation. The parameters c
and s
define a unitary matrix such that:
The parameter
z
is defined such that if |a
| >
|b
|, z
is s
; otherwise if c
is not 0 z
is
1/c
; otherwise z
is 1.rotg
supports the following precisions:T | T_real |
---|---|
float | float |
double | double |
std::complex<float> | float |
std::complex<double> | double |
rotg (Buffer Version)
Syntax
namespace oneapi::mkl::blas::column_major {
void rotg(sycl::queue &queue,
sycl::buffer<T,1> &a,
sycl::buffer<T,1> &b,
sycl::buffer<T_real,1> &c,
sycl::buffer<T,1> &s)
}
namespace oneapi::mkl::blas::row_major {
void rotg(sycl::queue &queue,
sycl::buffer<T,1> &a,
sycl::buffer<T,1> &b,
sycl::buffer<T_real,1> &c,
sycl::buffer<T,1> &s)
}
Input Parameters
- queue
- The queue where the routine should be executed
- a
- Buffer holdingx-coordinate of the point.
- b
- Buffer holdingy-coordinate of the point.
Output Parameters
- a
- Buffer holding parameterrassociated with the Givens rotation.
- b
- Buffer holding parameterzassociated with the Givens rotation.
- c
- Buffer holding parametercassociated with the Givens rotation.
- s
- Buffer holding parametersassociated with the Givens rotation.
rotg (USM Version)
Syntax
namespace oneapi::mkl::blas::column_major {
sycl::event rotg(sycl::queue &queue,
T *a,
T *b,
T_real *c,
T *s,
const std::vector<sycl::event> &dependencies = {})
}
namespace oneapi::mkl::blas::row_major {
sycl::event rotg(sycl::queue &queue,
T *a,
T *b,
T_real *c,
T *s,
const std::vector<sycl::event> &dependencies = {})
}
Input Parameters
- queue
- The queue where the routine should be executed
- a
- Pointer tox-coordinate of the point.
- b
- Pointer toy-coordinate of the point.
- dependencies
- List of events to wait for before starting computation, if any. If omitted, defaults to no dependencies.
Output Parameters
- a
- Pointer to parameterrassociated with the Givens rotation.
- b
- Pointer to parameterzassociated with the Givens rotation.
- c
- Pointer to parametercassociated with the Givens rotation.
- s
- Pointer to parametersassociated with the Givens rotation.
Return Values
Output event to wait on to ensure computation is complete.