center.m

% Author: Katerina Gkirtzou
% Copyright 2012-2013 Katerina Gkirtzou
%
% This file is part of the KsupportNormFMRICode package
% 
% KsupportNormFMRICode 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.
% 
% KsupportNormFMRICode 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 KsupportNormFMRICode.  If not, see
% <http://www.gnu.org/licenses/>.

function [data mu] = center(data)
% Center the data matrix to have zero mean columns.
% Input : 
%   data - an MxN array with the data to be centered 
% Output : 
%   data - an MxN array with the data columns centered.
%   mu - a M vector with the mean values for each column. 
% This function is part of the KsupportNormFMRICode package

    mu = mean(data);
    data = data - ones(size(data,1),1)*mu;
end

%% end of file