## 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

Generated by Doxygen 1.6.0 Back to index