update packages

[CreaPhase.git] / octave_packages / m / statistics / base / table.m

diff --git a/octave_packages/m/statistics/base/table.m b/octave_packages/m/statistics/base/table.m
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+## Copyright (C) 1995-2012 Kurt Hornik
+##
+## This file is part of Octave.
+##
+## Octave 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 3 of the License, or (at
+## your option) any later version.
+##
+## Octave 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 Octave; see the file COPYING.  If not, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn  {Function File} {[@var{t}, @var{l_x}] =} table (@var{x})
+## @deftypefnx {Function File} {[@var{t}, @var{l_x}, @var{l_y}] =} table (@var{x}, @var{y})
+## Create a contingency table @var{t} from data vectors.  The @var{l_x} and
+## @var{l_y} vectors are the corresponding levels.
+##
+## Currently, only 1- and 2-dimensional tables are supported.
+## @end deftypefn
+
+## Author: KH <Kurt.Hornik@wu-wien.ac.at>
+## Description: Cross tabulation
+
+function [t, v, w] = table (x, y)
+
+  if (nargin < 1 || nargin > 2)
+    print_usage ();
+  endif
+
+  if (nargin == 1)
+    if (!isnumeric (x) || !isvector (x))
+      error ("table: X must be a numeric vector");
+    endif
+    v = unique (x);
+    for i = 1 : length (v)
+      t(i) = sum (x == v(i) | isnan (v(i)) * isnan (x));
+    endfor
+  elseif (nargin == 2)
+    if (! (   isvector (x) && isnumeric (x)
+           && isvector (y) && isnumeric (y)
+           && (length (x) == length (y))))
+      error ("table: X and Y must be numeric vectors of the same length");
+    endif
+    v = unique (x);
+    w = unique (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
+  endif
+
+endfunction
+
+
+%% Test input validation
+%!error table ()
+%!error table (1, 2, 3)
+%!error table (ones (2))
+%!error table ([true true])
+%!error table (ones (2,1), true (2,1))
+%!error table (true (2,1), ones (2,1))
+%!error table (ones (2,2), ones (2,1))
+%!error table (ones (2,1), ones (2,2))
+%!error table (ones (2,1), ones (3,1))