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1 ## Copyright (C) 1995, 1996, 1997 Kurt Hornik |
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2 ## |
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3 ## This file is part of Octave. |
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4 ## |
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5 ## Octave is free software; you can redistribute it and/or modify it |
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6 ## under the terms of the GNU General Public License as published by |
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7 ## the Free Software Foundation; either version 3 of the License, or (at |
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8 ## your option) any later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but |
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 ## General Public License for more details. |
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14 ## |
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15 ## You should have received a copy of the GNU General Public License |
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16 ## along with Octave; see the file COPYING. If not, see |
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17 ## <http://www.gnu.org/licenses/>. |
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18 |
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19 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {[@var{t}, @var{l_x}] =} table (@var{x}) |
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21 ## @deftypefnx {Function File} {[@var{t}, @var{l_x}, @var{l_y}] =} table (@var{x}, @var{y}) |
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22 ## Create a contingency table @var{t} from data vectors. The @var{l} |
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23 ## vectors are the corresponding levels. |
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24 ## |
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25 ## Currently, only 1- and 2-dimensional tables are supported. |
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26 ## @end deftypefn |
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27 |
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28 ## Author: KH <Kurt.Hornik@wu-wien.ac.at> |
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29 ## Description: Cross tabulation |
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30 |
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31 function [t, v, w] = table (x, y) |
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32 |
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33 if (nargin == 1) |
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34 if (! (isvector (x))) |
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35 error ("table: x must be a vector"); |
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36 endif |
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37 v = values (x); |
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38 for i = 1 : length (v) |
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39 t(i) = sum (x == v(i) | isnan (v(i)) * isnan (x)); |
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40 endfor |
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41 elseif (nargin == 2) |
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42 if (! (isvector (x) && isvector (y) && (length (x) == length (y)))) |
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43 error ("table: x and y must be vectors of the same length"); |
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44 endif |
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45 v = values (x); |
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46 w = values (y); |
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47 for i = 1 : length (v) |
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48 for j = 1 : length (w) |
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49 t(i,j) = sum ((x == v(i) | isnan (v(i)) * isnan (x)) & |
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50 (y == w(j) | isnan (w(j)) * isnan (y))); |
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51 endfor |
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52 endfor |
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53 else |
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54 print_usage (); |
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55 endif |
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56 |
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57 endfunction |
