--- a +++ b/inst/unscale_parameters.m @@ -0,0 +1,40 @@ +# Copyright (C) 2003,2004 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, write to the Free Software +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + +# Unscales parameters that were estimated using scaled data +# primarily for use by BFGS +function [theta_us, vartheta_us] = unscale_parameters(theta, vartheta, scalecoefs); + k = rows(theta); + A = nth(scalecoefs, 1); + b = nth(scalecoefs, 2); + + kk = rows(b); + B = zeros(kk-1,kk); + B = [b'; B]; + + C = A + B; + + # allow for parameters that aren't associated with x + if (k > kk) + D = zeros(kk, k - kk); + C = [C, D; D', eye(k - kk)]; + endif; + + + + theta_us = C*theta; + vartheta_us = C * vartheta * C'; +endfunction