## Copyright (C) 1995, 1996, 1997 Kurt Hornik ## ## 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 2, or (at your option) ## 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 file. If not, write to the Free Software Foundation, ## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. ## usage: studentize (x) ## ## If x is a vector, subtract its mean and divide by its standard ## deviation. ## ## If x is a matrix, do the above for each column. ## Author: KH <Kurt.Hornik@ci.tuwien.ac.at> ## Description: Subtract mean and divide by standard deviation function t = studentize (x) if (nargin != 1) usage ("studentize (x)"); endif if is_vector (x) if (std (x) == 0) t = zeros (size (x)); else t = (x - mean (x)) / std (x); endif elseif is_matrix (x) l = ones (rows (x), 1); t = x - l * mean (x); t = t ./ (l * max ([std (t); !any (t)])); else error ("studentize: x must be a vector or a matrix."); endif endfunction

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