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+## Copyright (C) 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:  cut (X, BREAKS)
+##
+## Create categorical data out of numerical or continuous data by
+## cutting into intervals.
+##
+## If BREAKS is a scalar, the data is cut into that many equal-width
+## intervals. If BREAKS is a vector of break points, the category has
+## length(BREAKS)-1 groups.
+##
+## Returns a vector of the same size as X telling which group each point
+## in X belongs to.  Groups are labelled from 1 to the number of groups;
+## points outside the range of BREAKS are labelled by NaN.
+
+## Author:  KH <Kurt.Hornik@ci.tuwien.ac.at>
+## Description:  Cut data into intervals
+
+function group = cut (X, BREAKS)
+  
+  if (nargin != 2)
+    usage ("cut (X, BREAKS)");
+  endif
+
+  if !is_vector (X)
+    error ("cut:  X must be a vector");
+  endif
+  if is_scalar (BREAKS)
+    BREAKS = linspace (min (X), max (X), BREAKS + 1);
+    BREAKS(1) = BREAKS(1) - 1;
+  elseif is_vector (BREAKS)
+    BREAKS = sort (BREAKS);
+  else
+    error ("cut:  BREAKS must be a scalar or vector");
+  endif
+
+  group = NaN * ones (size (X));
+  m = length (BREAKS);
+  if any (k = find ((X >= min (BREAKS)) & (X <= max (BREAKS))))
+    n = length (k);
+    group(k) = sum ((ones (m, 1) * reshape (X(k), 1, n))
+		    > (reshape (BREAKS, m, 1) * ones (1, n)));
+  endif
+
+endfunction