Mercurial > octave-nkf
view scripts/statistics/distributions/uniform_cdf.m @ 4720:e759d01692db ss-2-1-53
[project @ 2004-01-23 04:13:37 by jwe]
author | jwe |
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date | Fri, 23 Jan 2004 04:13:37 +0000 |
parents | 38c61cbf086c |
children | 4b0f3b055331 |
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## Copyright (C) 1995, 1996, 1997 Kurt Hornik ## ## This file is part of Octave. ## ## Octave is free software; you can redistribute it and/or modify it ## under the terms of the GNU General Public License as published by ## the Free Software Foundation; either version 2, or (at your option) ## any later version. ## ## Octave is distributed in the hope that it will be useful, but ## WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ## General Public License for more details. ## ## You should have received a copy of the GNU General Public License ## along with Octave; see the file COPYING. If not, write to the Free ## Software Foundation, 59 Temple Place - Suite 330, Boston, MA ## 02111-1307, USA. ## -*- texinfo -*- ## @deftypefn {Function File} {} uniform_cdf (@var{x}, @var{a}, @var{b}) ## Return the CDF at @var{x} of the uniform distribution on [@var{a}, ## @var{b}], i.e., PROB (uniform (@var{a}, @var{b}) <= x). ## ## Default values are @var{a} = 0, @var{b} = 1. ## @end deftypefn ## Author: KH <Kurt.Hornik@ci.tuwien.ac.at> ## Description: CDF of the uniform distribution function cdf = uniform_cdf (x, a, b) if (! (nargin == 1 || nargin == 3)) usage ("uniform_cdf (x, a, b)"); endif if (nargin == 1) a = 0; b = 1; endif [retval, x, a, b] = common_size (x, a, b); if (retval > 0) error ("uniform_cdf: x, a and b must be of common size or scalar"); endif [r, c] = size (x); s = r * c; x = reshape (x, 1, s); a = reshape (a, 1, s); b = reshape (b, 1, s); cdf = zeros (1, s); k = find (isnan (x) | !(a < b)); if (any (k)) cdf(k) = NaN * ones (1, length (k)); endif k = find ((x >= b) & (a < b)); if (any (k)) cdf(k) = ones (1, length (k)); endif k = find ((x > a) & (x < b)); if (any (k)) cdf(k) = (x(k) < b(k)) .* (x(k) - a(k)) ./ (b(k) - a(k)); endif cdf = reshape (cdf, r, c); endfunction