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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
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