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prefun.m
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prefun.m
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function [pre_X,pre_param]=prefun(X,option)
% Preprocessing function
% apply range-scaling or auto-scaling
% Directed Batch Growing Self Organizing Map (DBGSOM)
% version 1.0 - July 2017
% Mahdi Vasighi
% Institute for Advanced Studies in Basic Sciences, Zanjan, Iran
% Department of Computer Science and Information Technology
% www.iasbs.ac.ir/~vasighi/
% Directed Batch Growing Self Organizing Map (DBGSOM), version 1.0
% Copyright (C) 2017 Mahdi Vasighi
%
% This program 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
% any later version.
%
% This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
[n1,~]=size(X);
switch option
case 'rs' % range scaling the columns
pre_X=(X-repmat(min(X),n1,1))./(repmat(max(X)-min(X),n1,1));
pre_param.min=min(X);
pre_param.max=max(X);
case 'as' % mean centering
pre_X=(X-repmat(mean(X),n1,1))./(repmat(std(X),n1,1));
pre_param.cmean=mean(X);
pre_param.cstd=std(X);
end