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OS/2 Shareware BBS: 10 Tools
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center.m
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1999-04-29
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1KB
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39 lines
## 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: center (x)
##
## If x is a vector, subtract its mean.
## If x is a matrix, do the above for each column.
## Author: KH <Kurt.Hornik@ci.tuwien.ac.at>
## Description: Center by subtracting means
function retval = center (x)
if (nargin != 1)
usage ("center (x)");
endif
if is_vec (x)
retval = x - mean(x);
elseif is_mat (x)
retval = x - ones (rows (x), 1) * mean(x);
else
error ("center: x must be a vector or a matrix.");
endif
endfunction