# Copyright (C) 2005 Michael Creel <michael.creel@uab.es> # # 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 of the License, 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 program; If not, see <http://www.gnu.org/licenses/>. # Example likelihood function (Poisson for count data) with score function [log_density, score] = poisson(theta, data, otherargs) y = data(:,1); x = data(:,2:columns(data)); lambda = exp(x*theta); log_density = -lambda + y .* (x*theta) - lgamma(y+1); score = dmult(y - lambda,x); if (otherargs{1} == 1) score = "na"; endif # provide analytic score or not? endfunction

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