Mercurial > octave-nkf
view scripts/statistics/distributions/discrete_pdf.m @ 3456:434790acb067
[project @ 2000-01-19 06:58:51 by jwe]
author | jwe |
---|---|
date | Wed, 19 Jan 2000 06:59:23 +0000 |
parents | f8dde1807dee |
children | 38c61cbf086c |
line wrap: on
line source
## 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_pdf (@var{x}, @var{v}, @var{p}) ## For each element of @var{x}, compute the probability density function ## (pDF) at @var{x} of a univariate discrete distribution which assumes ## the values in @var{v} with probabilities @var{p}. ## @end deftypefn ## Author: KH <Kurt.Hornik@ci.tuwien.ac.at> ## Description: pDF of a discrete distribution function pdf = discrete_pdf (x, v, p) if (nargin != 3) usage ("discrete_pdf (x, v, p)"); endif [r, c] = size (x); if (! is_vector (v)) error ("discrete_pdf: v must be a vector"); elseif (! is_vector (p) || (length (p) != length (v))) error ("discrete_pdf: p must be a vector with length (v) elements"); elseif (! (all (p >= 0) && any (p))) error ("discrete_pdf: 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); pdf = zeros (n, 1); k = find (isnan (x)); if (any (k)) pdf (k) = NaN * ones (length (k), 1); endif k = find (!isnan (x)); if (any (k)) n = length (k); pdf (k) = ((x(k) * ones (1, m)) == (ones (n, 1) * v)) * P; endif pdf = reshape (pdf, r, c); endfunction