Contents

# nrm2

Computes the Euclidean norm of a vector.

## Description

The
nrm2
routines compute Euclidean norm of a vector. The operation is defined as:
where:
• x
is a vector of
n
elements
nrm2
supports the following precisions:
T
T_res
sycl::half
sycl::half
oneapi::mkl::bfloat16
oneapi::mkl::bfloat16
float
float
double
double
std::complex<float>
float
std::complex<double>
double

## nrm2 (Buffer Version)

Syntax
``````namespace oneapi::mkl::blas::column_major {
void nrm2(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 nrm2(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 Euclidean norm of the vector
x
is stored.

## nrm2 (USM Version)

Syntax
``````namespace oneapi::mkl::blas::column_major {
sycl::event nrm2(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 nrm2(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 input vector
x
must be at 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 Euclidean norm of the vector
x
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.