Mercurial > octave-nkf
view scripts/statistics/distributions/geometric_cdf.m @ 4960:ce01dbd7e026 ss-2-1-58
[project @ 2004-09-02 03:47:49 by jwe]
author | jwe |
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date | Thu, 02 Sep 2004 03:47:49 +0000 |
parents | 265d566cc770 |
children | 4c8a2e4e0717 |
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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} {} geometric_cdf (@var{x}, @var{p}) ## For each element of @var{x}, compute the CDF at @var{x} of the ## geometric distribution with parameter @var{p}. ## @end deftypefn ## Author: KH <Kurt.Hornik@ci.tuwien.ac.at> ## Description: CDF of the geometric distribution function cdf = geometric_cdf (x, p) if (nargin != 2) usage ("geometric_cdf (x, p)"); endif if (!isscalar (x) && !isscalar (p)) [retval, x, p] = common_size (x, p); if (retval > 0) error ("geometric_cdf: x and p must be of common size or scalar"); endif endif cdf = zeros (size (x)); k = find (isnan (x) | !(p >= 0) | !(p <= 1)); if (any (k)) cdf(k) = NaN; endif k = find ((x == Inf) & (p >= 0) & (p <= 1)); if (any (k)) cdf(k) = 1; endif k = find ((x >= 0) & (x < Inf) & (x == round (x)) & (p > 0) & (p <= 1)); if (any (k)) if (isscalar (x)) cdf(k) = 1 - ((1 - p(k)) .^ (x + 1)); elseif (isscalar (p)) cdf(k) = 1 - ((1 - p) .^ (x(k) + 1)); else cdf(k) = 1 - ((1 - p(k)) .^ (x(k) + 1)); endif endif endfunction