1 ## Copyright (C) 2012 Rik Wehbring
2 ## Copyright (C) 1996-2012 Kurt Hornik
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} {} empirical_cdf (@var{x}, @var{data})
22 ## For each element of @var{x}, compute the cumulative distribution
23 ## function (CDF) at @var{x} of the empirical distribution obtained from
24 ## the univariate sample @var{data}.
27 ## Author: KH <Kurt.Hornik@wu-wien.ac.at>
28 ## Description: CDF of the empirical distribution
30 function cdf = empirical_cdf (x, data)
36 if (! isvector (data))
37 error ("empirical_cdf: DATA must be a vector");
40 cdf = discrete_cdf (x, data, ones (size (data)));
46 %! x = [-1 0.1 1.1 1.9 3];
48 %! y = [0 0.1 0.6 1 1];
49 %!assert(empirical_cdf (x, v), y, eps);
50 %!assert(empirical_cdf ([x(1) NaN x(3:5)], v), [0 NaN 0.6 1 1], eps);
52 %% Test class of input preserved
53 %!assert(empirical_cdf ([x, NaN], v), [y, NaN], eps);
54 %!assert(empirical_cdf (single([x, NaN]), v), single([y, NaN]), eps);
55 %!assert(empirical_cdf ([x, NaN], single(v)), single([y, NaN]), eps);
57 %% Test input validation
58 %!error empirical_cdf ()
59 %!error empirical_cdf (1)
60 %!error empirical_cdf (1,2,3)
61 %!error empirical_cdf (1, ones(2))