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 |
Tc |
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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<Tc,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<Tc,1> &c,
sycl::buffer<T,1> &s)
}
Input Parameters#
- queue
The queue where the routine should be executed
- a
Buffer holding
x-coordinate of the point.- b
Buffer holding
y-coordinate of the point.
Output Parameters#
- a
Buffer holding parameter
rassociated with the Givens rotation.- b
Buffer holding parameter
zassociated with the Givens rotation.- c
Buffer holding parameter
cassociated with the Givens rotation.- s
Buffer holding parameter
sassociated with the Givens rotation.
rotg (USM Version)#
Syntax#
namespace oneapi::mkl::blas::column_major {
sycl::event rotg(sycl::queue &queue,
T *a,
T *b,
Tc *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,
Tc *c,
T *s,
const std::vector<sycl::event> &dependencies = {})
}
Input Parameters#
- queue
The queue where the routine should be executed
- a
Pointer to
x-coordinate of the point.- b
Pointer to
y-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 parameter
rassociated with the Givens rotation.- b
Pointer to parameter
zassociated with the Givens rotation.- c
Pointer to parameter
cassociated with the Givens rotation.- s
Pointer to parameter
sassociated with the Givens rotation.
Return Values#
Output event to wait on to ensure computation is complete.