home *** CD-ROM | disk | FTP | other *** search
- ## 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