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1 ## Copyright (C) 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} {} hygernd (@var{m}, @var{t}, @var{n}, @var{r}, @var{c}) |
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22 ## @deftypefnx {Function File} {} hygernd (@var{m}, @var{t}, @var{n}, @var{sz}) |
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23 ## Return an @var{r} by @var{c} matrix of random samples from the |
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24 ## hypergeometric distribution with parameters @var{m}, @var{t}, |
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25 ## and @var{n}. |
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26 ## |
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27 ## The parameters @var{m}, @var{t}, and @var{n} must positive integers |
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28 ## with @var{m} and @var{n} not greater than @var{t}. |
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29 ## @end deftypefn |
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30 |
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31 ## function rnd = hygernd (N, m, t, n) |
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32 function rnd = hygernd (m, t, n, r, c) |
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33 |
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34 if (nargin == 5) |
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35 if (! (isscalar (r) && (r > 0) && (r == round (r)))) |
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36 error ("hygernd: r must be a positive integer"); |
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37 endif |
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38 if (! (isscalar (c) && (c > 0) && (c == round (c)))) |
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39 error ("hygernd: c must be a positive integer"); |
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40 endif |
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41 sz = [r, c]; |
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42 elseif (nargin == 4) |
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43 ## A potential problem happens here if all args are scalar, as |
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44 ## we can distiguish between the command syntax. This is quite |
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45 ## ambigous! I assume that if the last arg is a vector then |
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46 ## then third form is assumed. This means that you can't define |
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47 ## and r-by-r matrix with a single scalar! |
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48 |
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49 if (isscalar (r)) |
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50 sz = [1, floor(m)]; |
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51 m = t; |
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52 t = n; |
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53 n = r; |
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54 elseif (isvector(r) && all (r > 0)) |
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55 sz = r(:)'; |
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56 else |
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57 error ("hygernd: r must be a vector of positive integers"); |
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58 endif |
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59 else |
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60 print_usage (); |
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61 endif |
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62 |
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63 if (!isscalar (m) || !isscalar (t) || !isscalar (n)) |
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64 error ("hygernd: m, t and n must all be positive integers"); |
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65 endif |
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66 |
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67 if ((m < 0) | (t < 0) | (n <= 0) | (m != round (m)) | |
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68 (t != round (t)) | (n != round (n)) | (m > t) | (n > t)) |
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69 rnd = NaN * ones (sz) |
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70 else |
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71 rnd = discrete_rnd (0 : n, hygepdf (0 : n, m, t, n), sz); |
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72 endif |
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73 |
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74 endfunction |
