1 ## Copyright (C) 2012 Rik Wehbring
2 ## Copyright (C) 2007-2012 David Bateman
4 ## This file is part of Octave.
6 ## Octave is free software; you can redistribute it and/or modify it
7 ## under the terms of the GNU General Public License as published by
8 ## the Free Software Foundation; either version 3 of the License, or (at
9 ## your option) any later version.
11 ## Octave is distributed in the hope that it will be useful, but
12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 ## General Public License for more details.
16 ## You should have received a copy of the GNU General Public License
17 ## along with Octave; see the file COPYING. If not, see
18 ## <http://www.gnu.org/licenses/>.
21 ## @deftypefn {Function File} {} unidcdf (@var{x}, @var{n})
22 ## For each element of @var{x}, compute the cumulative distribution
23 ## function (CDF) at @var{x} of a discrete uniform distribution which assumes
24 ## the integer values 1--@var{n} with equal probability.
27 function cdf = unidcdf (x, n)
34 [retval, x, n] = common_size (x, n);
36 error ("unidcdf: X and N must be of common size or scalars");
40 if (iscomplex (x) || iscomplex (n))
41 error ("unidcdf: X and N must not be complex");
44 if (isa (x, "single") || isa (n, "single"))
45 cdf = zeros (size (x), "single");
47 cdf = zeros (size (x));
50 knan = isnan (x) | ! (n > 0 & n == fix (n));
58 k = (x >= 1) & (x < n) & !knan;
60 cdf(k) = floor (x(k)) / n;
62 cdf(k) = floor (x(k)) ./ n(k);
69 %! x = [0 1 2.5 10 11];
70 %! y = [0, 0.1 0.2 1.0 1.0];
71 %!assert(unidcdf (x, 10*ones(1,5)), y);
72 %!assert(unidcdf (x, 10), y);
73 %!assert(unidcdf (x, 10*[0 1 NaN 1 1]), [NaN 0.1 NaN y(4:5)]);
74 %!assert(unidcdf ([x(1:2) NaN Inf x(5)], 10), [y(1:2) NaN 1 y(5)]);
76 %% Test class of input preserved
77 %!assert(unidcdf ([x, NaN], 10), [y, NaN]);
78 %!assert(unidcdf (single([x, NaN]), 10), single([y, NaN]));
79 %!assert(unidcdf ([x, NaN], single(10)), single([y, NaN]));
81 %% Test input validation
84 %!error unidcdf (1,2,3)
85 %!error unidcdf (ones(3),ones(2))
86 %!error unidcdf (ones(2),ones(3))
87 %!error unidcdf (i, 2)
88 %!error unidcdf (2, i)