powx#

Computes vector a to the scalar power b.

Syntax

Buffer API:

namespace oneapi::math::vm {

sycl::event powx(
        sycl::queue& exec_queue,
        std::int64_t n,
        sycl::buffer<T,1>& a,
        T b,
        sycl::buffer<T,1>& y,
        oneapi::math::vm::mode mode = oneapi::math::vm::mode::not_defined,
        oneapi::math::vm::error_handler<T> errhandler = {});

} // namespace oneapi::math::vm

USM API:

namespace oneapi::math::vm {

sycl::event powx(
        sycl::queue& exec_queue,
        std::int64_t n,
        const T *a,
        T b,
        T* y,
        std::vector<sycl::event> const & depends = {},
        oneapi::math::vm::mode mode = oneapi::math::vm::mode::not_defined,
        oneapi::math::vm::error_handler<T> errhandler = {});

} // namespace oneapi::math::vm

powx supports the following precisions.

T
`float`
`double`
`std::complex<float>`
`std::complex<double>`

Description

The powx function computes a to the power b for a vector a and a scalar b.

The real function powx has certain limitations on the input range of a and b parameters. Specifically, if a[i] is positive, then b may be arbitrary. For negative a[i], the value of b must be an integer (either positive or negative).

The complex function powx has no input range limitations.

Special values and VM status code treatment are the same as for the pow function.

Input Parameters

Buffer API:

exec_queue: The queue where the routine should be executed.
n: Specifies the number of elements to be calculated.
a: The buffer a containing 1st input vector of size n.
b: Fixed value of power b.
mode: Overrides the global VM mode setting for this function call. See set_mode function for possible values and their description. This is an optional parameter. The default value is oneapi::math::vm::mode::not_defined.
errhandler: Sets local error handling mode for this function call. See the create_error_handler function for arguments and their descriptions. This is an optional parameter. The local error handler is disabled by default.

USM API:

exec_queue: The queue where the routine should be executed.
n: Specifies the number of elements to be calculated.
a: Pointer a to the 1st input vector of size n.
b: Fixed value of power b.
depends: Vector of dependent events (to wait for input data to be ready).
mode: Overrides the global VM mode setting for this function call. See the set_mode function for possible values and their description. This is an optional parameter. The default value is oneapi::math::vm::mode::not_defined.
errhandler: Sets local error handling mode for this function call. See the create_error_handler function for arguments and their descriptions. This is an optional parameter. The local error handler is disabled by default.

Output Parameters

Buffer API:

y: The buffer y containing the output vector of size n.

USM API:

y: Pointer y to the output vector of size n.
return value (event): Event, signifying availability of computed output and status code(s).

Exceptions

For list of generated exceptions please refer to Exceptions

Parent topic: VM Mathematical Functions