rotg

oneMKL - Data Parallel C++ Developer Reference

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ID 772045

Date 10/31/2024

Version

Public

Visible to Intel only — GUID: GUID-777CF5EE-5FD3-42C1-8647-DF4E563526BE

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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.

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oneMKL - Data Parallel C++ Developer Reference

rotg

Description

rotg (Buffer Version)

rotg (USM Version)