A newer version of this document is available. Customers should click here to go to the newest version.
Visible to Intel only — GUID: GUID-F36A5701-E42A-4A6C-B8B6-A7A3E224DD58
Visible to Intel only — GUID: GUID-F36A5701-E42A-4A6C-B8B6-A7A3E224DD58
arg
Computes the argument of vector elements in [-pi, pi].
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· |
+ |
+ |
+ |
+ |
+ |
NAN |
+i·Y |
+ |
+ |
+ |
+0 |
NAN |
||
+i·0 |
+ |
+ |
+ |
+0 |
+0 |
+0 |
NAN |
-i·0 |
- |
- |
- |
-0 |
-0 |
-0 |
NAN |
-i·Y |
- |
- |
- |
-0 |
NAN |
||
-i· |
-3· |
- |
- |
- |
- |
- |
NAN |
+i·NAN |
NAN |
NAN |
NAN |
NAN |
NAN |
NAN |
NAN |
/2The 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:
share/doc/mkl/examples/sycl/vml/source/varg.cpp