Programming-Idioms

Idiom

# 201 Euclidean norm

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Calculate _n, the Euclidean norm of _data (an array or list of floating point values).

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Other implementations

n = norm2( data )

math

var
  data: array of double;
...
  n := norm(data);
...

use Math::GSL::Vector qw();
use Math::GSL::BLAS qw(gsl_blas_dnrm2);

my $data = [5.0, 4.0, 3.0, 2.0, 1.0];
my $n = gsl_blas_dnrm2(Math::GSL::Vector->new($data)->raw);

import numpy as np

np.linalg.norm(data)

require 'matrix'

data = Vector[5.0, 4.0, 3.0, 2.0, 1.0]
n = data.norm