## 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: [t, l_x] = table (x) ## [t, l_x, l_y] = table (x, y) ## ## Create a contingency table t from data vectors. The l vectors are ## the corresponding levels. ## ## Currently, only 1- and 2-dimensional tables are supported. ## Author: KH <Kurt.Hornik@ci.tuwien.ac.at> ## Description: Cross tabulation function [t, v, w] = table (x, y) if (nargin == 1) if !(is_vector (x)) error ("table: x must be a vector"); endif v = values (x); for i = 1 : length (v) t(i) = sum (x == v(i) | isnan (v(i)) * isnan (x)); endfor elseif (nargin == 2) if !(is_vector (x) && is_vector (y) && (length (x) == length (y))) error ("table: x and y must be vectors of the same length"); endif v = values (x); w = values (y); for i = 1 : length (v) for j = 1 : length (w) t(i,j) = sum ((x == v(i) | isnan (v(i)) * isnan (x)) & (y == w(j) | isnan (w(j)) * isnan (y))); endfor endfor else usage ("[t, l_x, ...] = table (x, ...)"); endif endfunction

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