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annotate scripts/statistics/distributions/chi2cdf.m @ 20830:b65888ec820e draft default tip gccjit

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dmalcom gcc jit import
author Stefan Mahr <dac922@gmx.de>
date Fri, 27 Feb 2015 16:59:36 +0100
parents d9341b422488
children
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1 ## Copyright (C) 2012 Rik Wehbring
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2 ## Copyright (C) 1995-2015 Kurt Hornik
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} chi2cdf (@var{x}, @var{n})
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22 ## For each element of @var{x}, compute the cumulative distribution function
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23 ## (CDF) at @var{x} of the chi-square distribution with @var{n} degrees of
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24 ## freedom.
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25 ## @end deftypefn
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27 ## Author: TT <Teresa.Twaroch@ci.tuwien.ac.at>
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28 ## Description: CDF of the chi-square distribution
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29
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30 function cdf = chi2cdf (x, n)
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31
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32 if (nargin != 2)
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33 print_usage ();
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34 endif
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35
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36 if (! isscalar (n))
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37 [retval, x, n] = common_size (x, n);
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38 if (retval > 0)
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39 error ("chi2cdf: X and N must be of common size or scalars");
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40 endif
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41 endif
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42
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43 if (iscomplex (x) || iscomplex (n))
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44 error ("chi2cdf: X and N must not be complex");
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45 endif
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46
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47 cdf = gamcdf (x, n/2, 2);
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48
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49 endfunction
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51
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52 %!shared x,y
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53 %! x = [-1 0 0.5 1 2];
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54 %! y = [0, 1 - exp(-x(2:end)/2)];
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55 %!assert (chi2cdf (x, 2*ones (1,5)), y, eps)
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56 %!assert (chi2cdf (x, 2), y, eps)
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57 %!assert (chi2cdf (x, 2*[1 0 NaN 1 1]), [y(1) NaN NaN y(4:5)], eps)
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58 %!assert (chi2cdf ([x(1:2) NaN x(4:5)], 2), [y(1:2) NaN y(4:5)], eps)
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59
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60 ## Test class of input preserved
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61 %!assert (chi2cdf ([x, NaN], 2), [y, NaN], eps)
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62 %!assert (chi2cdf (single ([x, NaN]), 2), single ([y, NaN]), eps ("single"))
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63 %!assert (chi2cdf ([x, NaN], single (2)), single ([y, NaN]), eps ("single"))
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64
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65 ## Test input validation
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66 %!error chi2cdf ()
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67 %!error chi2cdf (1)
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68 %!error chi2cdf (1,2,3)
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69 %!error chi2cdf (ones (3), ones (2))
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70 %!error chi2cdf (ones (2), ones (3))
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71 %!error chi2cdf (i, 2)
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72 %!error chi2cdf (2, i)
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73