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1 ## Copyright (C) 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 2, or (at your option) |
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8 ## 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, write to the Free |
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17 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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18 ## 02110-1301, USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} cut (@var{x}, @var{breaks}) |
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22 ## Create categorical data out of numerical or continuous data by |
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23 ## cutting into intervals. |
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24 ## |
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25 ## If @var{breaks} is a scalar, the data is cut into that many |
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26 ## equal-width intervals. If @var{breaks} is a vector of break points, |
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27 ## the category has @code{length (@var{breaks}) - 1} groups. |
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28 ## |
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29 ## The returned value is a vector of the same size as @var{x} telling |
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30 ## which group each point in @var{x} belongs to. Groups are labelled |
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31 ## from 1 to the number of groups; points outside the range of |
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32 ## @var{breaks} are labelled by @code{NaN}. |
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33 ## @end deftypefn |
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34 |
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35 ## Author: KH <Kurt.Hornik@wu-wien.ac.at> |
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36 ## Description: Cut data into intervals |
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37 |
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38 function group = cut (X, BREAKS) |
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39 |
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40 if (nargin != 2) |
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41 usage ("cut (X, BREAKS)"); |
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42 endif |
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43 |
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44 if (! isvector (X)) |
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45 error ("cut: X must be a vector"); |
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46 endif |
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47 if isscalar (BREAKS) |
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48 BREAKS = linspace (min (X), max (X), BREAKS + 1); |
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49 BREAKS(1) = BREAKS(1) - 1; |
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50 elseif isvector (BREAKS) |
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51 BREAKS = sort (BREAKS); |
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52 else |
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53 error ("cut: BREAKS must be a scalar or vector"); |
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54 endif |
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55 |
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56 group = NaN * ones (size (X)); |
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57 m = length (BREAKS); |
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58 if any (k = find ((X >= min (BREAKS)) & (X <= max (BREAKS)))) |
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59 n = length (k); |
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60 group(k) = sum ((ones (m, 1) * reshape (X(k), 1, n)) |
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61 > (reshape (BREAKS, m, 1) * ones (1, n))); |
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62 endif |
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63 |
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64 endfunction |
