asum (USM Version)

Computes the sum of magnitudes of the vector elements.

Syntax

event asum(queue &exec_queue, std::int64_t n, const T *x, std::int64_t incx, T_res *result, const vector_class<event> &dependencies = {})

The USM version of asum supports the following precisions and devices.

T

T_res

Devices Supported

float

float

Host, CPU, and GPU

double

double

Host, CPU, and GPU

std::complex<float>

float

Host, CPU, and GPU

std::complex<double>

double

Host, CPU, and GPU

Description

The asum routine computes the sum of the magnitudes of elements of a real vector, or the sum of magnitudes of the real and imaginary parts of elements of a complex vector:

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where x is a vector with n elements.

Input Parameters

exec_queue

The queue where the routine should be executed.

n

Number of elements in vector x.

x

Pointer to input vector x. The array holding the vector x must be of size at least (1 + (n - 1)*abs(incx)). See Matrix and Vector Storage for more details.

incx

Stride of vector x.

dependencies

List of events to wait for before starting computation, if any. If omitted, defaults to no dependencies.

Output Parameters

result

Pointer to the output matrix where the scalar result is stored (the sum of magnitudes of the real and imaginary parts of all elements of the vector).

Return Values

Output event to wait on to ensure computation is complete.