Contents

# asum

Computes the sum of magnitudes of the vector elements.

## 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. The operation is defined as:
where:
• x
is a vector with
n
elements
asum
supports the following precisions:
T
T_res
float
float
double
double
std::complex<float>
float
std::complex<double>
double

## asum (Buffer Version)

Syntax
``````namespace oneapi::mkl::blas::column_major {
void asum(sycl::queue &queue,
std::int64_t n,
sycl::buffer<T,1> &x,
std::int64_t incx,
sycl::buffer<T_res,1> &result)
}``````
``````namespace oneapi::mkl::blas::row_major {
void asum(sycl::queue &queue,
std::int64_t n,
sycl::buffer<T,1> &x,
std::int64_t incx,
sycl::buffer<T_res,1> &result)
}``````
Input Parameters
queue
The queue where the routine should be executed.
n
Number of elements in vector
x
.
x
Buffer holding input vector
x
. Size of the buffer must be at least (1 + (
n
- 1)*abs(
incx
)). See Matrix Storage for more details.
incx
Stride of vector
x
.
Output Parameters
result
Buffer where the scalar result is stored.

## asum (USM Version)

Syntax
``````namespace oneapi::mkl::blas::column_major {
sycl::event asum(sycl::queue &queue,
std::int64_t n,
const T *x,
std::int64_t incx,
T_res *result,
const std::vector<sycl::event> &dependencies = {})
}``````
``````namespace oneapi::mkl::blas::row_major {
sycl::event asum(sycl::queue &queue,
std::int64_t n,
const T *x,
std::int64_t incx,
T_res *result,
const std::vector<sycl::event> &dependencies = {})
}``````
Input Parameters
queue
The queue where the routine should be executed.
n
Number of elements in vector
x
.
x
Pointer to input vector
x
. Size of the array holding vector
x
must be least (1 + (
n
- 1)*abs(
incx
)). See Matrix 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 where the scalar result is stored.
Return Values
Output event to wait on to ensure computation is complete.

#### Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.