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1 ## Copyright (C) 1996, 1997 Kurt Hornik |
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2 ## |
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3 ## This program is free software; you can redistribute it and/or modify |
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4 ## it under the terms of the GNU General Public License as published by |
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5 ## the Free Software Foundation; either version 2, or (at your option) |
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6 ## any later version. |
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7 ## |
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8 ## This program is distributed in the hope that it will be useful, but |
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9 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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11 ## General Public License for more details. |
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12 ## |
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13 ## You should have received a copy of the GNU General Public License |
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14 ## along with this file. If not, write to the Free Software Foundation, |
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15 ## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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16 |
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17 ## usage: cut (X, BREAKS) |
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18 ## |
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19 ## Create categorical data out of numerical or continuous data by |
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20 ## cutting into intervals. |
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21 ## |
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22 ## If BREAKS is a scalar, the data is cut into that many equal-width |
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23 ## intervals. If BREAKS is a vector of break points, the category has |
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24 ## length(BREAKS)-1 groups. |
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25 ## |
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26 ## Returns a vector of the same size as X telling which group each point |
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27 ## in X belongs to. Groups are labelled from 1 to the number of groups; |
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28 ## points outside the range of BREAKS are labelled by NaN. |
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29 |
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30 ## Author: KH <Kurt.Hornik@ci.tuwien.ac.at> |
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31 ## Description: Cut data into intervals |
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32 |
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33 function group = cut (X, BREAKS) |
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34 |
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35 if (nargin != 2) |
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36 usage ("cut (X, BREAKS)"); |
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37 endif |
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38 |
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39 if !is_vector (X) |
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40 error ("cut: X must be a vector"); |
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41 endif |
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42 if is_scalar (BREAKS) |
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43 BREAKS = linspace (min (X), max (X), BREAKS + 1); |
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44 BREAKS(1) = BREAKS(1) - 1; |
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45 elseif is_vector (BREAKS) |
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46 BREAKS = sort (BREAKS); |
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47 else |
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48 error ("cut: BREAKS must be a scalar or vector"); |
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49 endif |
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50 |
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51 group = NaN * ones (size (X)); |
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52 m = length (BREAKS); |
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53 if any (k = find ((X >= min (BREAKS)) & (X <= max (BREAKS)))) |
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54 n = length (k); |
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55 group(k) = sum ((ones (m, 1) * reshape (X(k), 1, n)) |
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56 > (reshape (BREAKS, m, 1) * ones (1, n))); |
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57 endif |
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58 |
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59 endfunction |
