arg

oneMKL - Data Parallel C++ Developer Reference

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ID 772045

Date 3/31/2021

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arg

Computes the argument of vector elements in [-pi, pi].

Description
API
Examples

Description

The arg(a) function computes argument of vector elements.

See Special Value Notations for the conventions used in the table below.

RE(a) i·IM(a)	-	-X	-0	+0	+X	+	NAN
+i·	+3·	+/2	+/2	+/2	+/2	+/4	NAN
+i·Y	+		+/2	+/2		+0	NAN
+i·0	+	+	+	+0	+0	+0	NAN
-i·0	-	-	-	-0	-0	-0	NAN
-i·Y	-		-/2	-/2		-0	NAN
-i·	-3·/4	-/2	-/2	-/2	-/2	-/4	NAN
+i·NAN	NAN	NAN	NAN	NAN	NAN	NAN	NAN

NOTE:

arg(a)=atan2(IM(a),RE(a))

The arg function does not generate any errors.

API

Syntax

Buffer API

namespace oneapi::mkl::vm {

sycl::event arg(sycl::queue & exec_queue,
      std::int64_t n,
      sycl::buffer<T> & a,
      sycl::buffer<T> & y,
      oneapi::mkl::vm::mode mode = oneapi::mkl::vm::mode::not_defined);

}

namespace oneapi::mkl::vm {

sycl::event arg(sycl::queue & exec_queue,
      sycl::buffer<T> & a,
      oneapi::mkl::slice sa,
      sycl::buffer<T> & y,
      oneapi::mkl::slice sy,
      oneapi::mkl::vm::mode mode = oneapi::mkl::vm::mode::not_defined);

}

USM API

namespace oneapi::mkl::vm {

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

}

namespace oneapi::mkl::vm {

sycl::event arg(sycl::queue & exec_queue,
      T const * a,
      oneapi::mkl::slice sa,
      T * y,
      oneapi::mkl::slice sy,
      std::vector<sycl::event> const & depends = {},
      oneapi::mkl::vm::mode mode = oneapi::mkl::vm::mode::not_defined);

}

arg supports the following precisions and devices:

T	Devices supported
`std::complex<float>`	CPU and GPU
`std::complex<double>`	CPU and GPU

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 containing the input vector.
sa: Slice selector for a. See Data Types for a description of the oneMKL slice type.
sy: Slice selector for y. See Data Types for a description of the oneMKL slice type.
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 mode::not_defined.

USM API

exec_queue: The queue where the routine should be executed.
n: Specifies the number of elements to be calculated.
a: Pointer to the input vector.
sa: Slice selector for a. See Data Types for a description of the oneMKL slice type.
sy: Slice selector for y. See Data Types for a description of the oneMKL slice type.
depends: Vector of dependent events (to wait for input data to be ready). This is an optional parameter. The default is an empty vector.
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 mode::not_defined.

Output Parameters

Buffer API

y: The buffer containing the output vector.
return value (event): Computation end event.

USM API

y: Pointer to the output vector.
return value (event): Computation end event.

Examples

An example of how to use arg can be found in the oneMKL installation directory, under:

examples/dpcpp/vml/source/varg.cpp

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oneMKL - Data Parallel C++ Developer Reference

arg

Description

API

Examples