Mercurial > octave-nkf
view scripts/statistics/distributions/poisscdf.m @ 14138:72c96de7a403 stable
maint: update copyright notices for 2012
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 02 Jan 2012 14:25:41 -0500 |
parents | 19b9f17d22af |
children | f3d52523cde1 |
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## Copyright (C) 2012 Rik Wehbring ## Copyright (C) 1995-2012 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 3 of the License, 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, see ## <http://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {Function File} {} poisscdf (@var{x}, @var{lambda}) ## For each element of @var{x}, compute the cumulative distribution ## function (CDF) at @var{x} of the Poisson distribution with parameter ## lambda. ## @end deftypefn ## Author: KH <Kurt.Hornik@wu-wien.ac.at> ## Description: CDF of the Poisson distribution function cdf = poisscdf (x, lambda) if (nargin != 2) print_usage (); endif if (!isscalar (lambda)) [retval, x, lambda] = common_size (x, lambda); if (retval > 0) error ("poisscdf: X and LAMBDA must be of common size or scalars"); endif endif if (iscomplex (x) || iscomplex (lambda)) error ("poisscdf: X and LAMBDA must not be complex"); endif if (isa (x, "single") || isa (lambda, "single")) cdf = zeros (size (x), "single"); else cdf = zeros (size (x)); endif k = isnan (x) | !(lambda > 0); cdf(k) = NaN; k = (x == Inf) & (lambda > 0); cdf(k) = 1; k = (x >= 0) & (x < Inf) & (lambda > 0); if (isscalar (lambda)) cdf(k) = 1 - gammainc (lambda, floor (x(k)) + 1); else cdf(k) = 1 - gammainc (lambda(k), floor (x(k)) + 1); endif endfunction %!shared x,y %! x = [-1 0 1 2 Inf]; %! y = [0, gammainc(1, (x(2:4) +1), 'upper'), 1]; %!assert(poisscdf (x, ones(1,5)), y); %!assert(poisscdf (x, 1), y); %!assert(poisscdf (x, [1 0 NaN 1 1]), [y(1) NaN NaN y(4:5)]); %!assert(poisscdf ([x(1:2) NaN Inf x(5)], 1), [y(1:2) NaN 1 y(5)]); %% Test class of input preserved %!assert(poisscdf ([x, NaN], 1), [y, NaN]); %!assert(poisscdf (single([x, NaN]), 1), single([y, NaN]), eps("single")); %!assert(poisscdf ([x, NaN], single(1)), single([y, NaN]), eps("single")); %% Test input validation %!error poisscdf () %!error poisscdf (1) %!error poisscdf (1,2,3) %!error poisscdf (ones(3),ones(2)) %!error poisscdf (ones(2),ones(3)) %!error poisscdf (i, 2) %!error poisscdf (2, i)