Visible to Intel only — GUID: GUID-3C3EA273-E3F2-4FC9-8C35-6DC8C7AD6BE5
Visible to Intel only — GUID: GUID-3C3EA273-E3F2-4FC9-8C35-6DC8C7AD6BE5
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 |
---|---|
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<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 r associated with the Givens rotation.
- b
-
Buffer holding parameter z associated with the Givens rotation.
- c
-
Buffer holding parameter c associated with the Givens rotation.
- s
-
Buffer holding parameter s associated 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 r associated with the Givens rotation.
- b
-
Pointer to parameter z associated with the Givens rotation.
- c
-
Pointer to parameter c associated with the Givens rotation.
- s
-
Pointer to parameter s associated with the Givens rotation.
Return Values
Output event to wait on to ensure computation is complete.