abs¶
Computes absolute value of vector elements.
Description¶
The abs(a) function computes an absolute value of vector elements.
Argument |
Result |
Error Code |
|---|---|---|
+0 |
+0 |
|
-0 |
+0 |
|
+ |
+ |
|
- |
+ |
|
QNAN |
QNAN |
|
SNAN |
QNAN |
Specifications for special values of the complex functions are defined according to the following formula
abs(a) = hypot(RE(a),IM(a)).
The abs function does not generate any errors.
API¶
Syntax¶
Buffer API
namespace oneapi::mkl::vm {
sycl::event abs(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 abs(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 abs(sycl::queue & exec_queue,
std::int64_t n,
T const * a,
T * y,
std::vector<cl::sycl::event> const & depends = {},
oneapi::mkl::vm::mode mode = oneapi::mkl::vm::mode::not_defined);
}
namespace oneapi::mkl::vm {
sycl::event abs(sycl::queue & exec_queue,
T const * a,
oneapi::mkl::slice sa,
T * y,
oneapi::mkl::slice sy,
std::vector<cl::sycl::event> const & depends = {},
oneapi::mkl::vm::mode mode = oneapi::mkl::vm::mode::not_defined);
}
abs supports the following precisions and devices:
T |
Devices supported |
|---|---|
|
Host, CPU, and GPU |
|
Host, CPU, and GPU |
|
Host, CPU, and GPU |
|
Host, 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 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 abs can be found in the oneMKL
installation directory, under:
examples/dpcpp/vml/source/vabs.cpp