Mercurial > octave-nkf
view scripts/statistics/distributions/discrete_cdf.m @ 3837:bb3e654d6684
[project @ 2001-06-07 00:24:25 by jwe]
author | jwe |
---|---|
date | Thu, 07 Jun 2001 00:24:25 +0000 |
parents | 434790acb067 |
children | 38c61cbf086c |
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## Copyright (C) 1996, 1997 Kurt Hornik ## ## This program 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. ## ## This program 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 this file. If not, write to the Free Software Foundation, ## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. ## -*- texinfo -*- ## @deftypefn {Function File} {} discrete_cdf (@var{x}, @var{v}, @var{p}) ## For each element of @var{x}, compute the cumulative distribution ## function (CDF) at @var{x} of a univariate discrete distribution which ## assumes the values in v with probabilities @var{p}. ## @end deftypefn ## Author: KH <Kurt.Hornik@ci.tuwien.ac.at> ## Description: CDF of a discrete distribution function cdf = discrete_cdf (x, v, p) if (nargin != 3) usage ("discrete_cdf (x, v, p)"); endif [r, c] = size (x); if (! is_vector (v)) error ("discrete_cdf: v must be a vector"); elseif (! is_vector (p) || (length (p) != length (v))) error ("discrete_cdf: p must be a vector with length (v) elements"); elseif (! (all (p >= 0) && any (p))) error ("discrete_cdf: p must be a nonzero, nonnegative vector"); endif n = r * c; m = length (v); x = reshape (x, n, 1); v = reshape (v, 1, m); p = reshape (p / sum (p), m, 1); cdf = zeros (n, 1); k = find (isnan (x)); if (any (k)) cdf (k) = NaN * ones (length (k), 1); endif k = find (!isnan (x)); if (any (k)) n = length (k); cdf (k) = ((x(k) * ones (1, m)) >= (ones (n, 1) * v)) * p; endif cdf = reshape (cdf, r, c); endfunction