1. Zoltán Szabó
  2. ITE


ITE / code / H_I_D / utilities / compute_length_HRenyi_kNN_1tok.m

function [L] = compute_length_HRenyi_kNN_1tok(Y,co)
%Computes the length (L) associated to the 'Renyi_kNN_1tok' Renyi entropy estimator.
%    Y: Y(:,t) is the t^th sample.
%   co: cost object.
%Copyright (C) 2012 Zoltan Szabo ("http://nipg.inf.elte.hu/szzoli", "szzoli (at) cs (dot) elte (dot) hu")
%This file is part of the ITE (Information Theoretical Estimators) Matlab/Octave toolbox.
%ITE is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
%the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
%This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
%MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
%You should have received a copy of the GNU General Public License along with ITE. If not, see <http://www.gnu.org/licenses/>.

d = size(Y,1);
squared_distances = kNN_squared_distances(Y,Y,co,1);
gam = d * (1-co.alpha);
L = sum(sum(squared_distances.^(gam/2),1));