norm2.m

来自「Lattice coding and decoding」· M 代码 · 共 19 行

function out = norm2(in)

%NORM2 Squared norm
%   Y = NORM2(X) returns squared norm of vector X; Y = ||X||^2.
%
%   D = NORM2(X-Y) is mostly used to evaluate minimum squared distance
%   between two vectors X and Y; D = ||X - Y||^2.
%
%   See also NORM.

%   Copyright 2001-2003 Kamil Anis, [e-mail]
%   Dept. of Radioelectronics, 
%   Faculty of Electrical Engineering
%   Czech Technical University in Prague
%   $Revision: 0.1 $  $Date: 2003/1/16 17:33:28 $
%   --
%   <additional stuff goes here>

out = sum(abs(in).^2);