--- a
+++ b/unscale_parameters.m
@@ -0,0 +1,77 @@
+# Copyright (C) 2003,2004  Michael Creel michael.creel@uab.es
+# under the terms of the GNU General Public License.
+# 
+# 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
+ 
+# Copyright (C) 2003  Michael Creel michael.creel@uab.es
+# under the terms of the GNU General Public License.
+# The GPL license is in the file COPYING
+# 
+# 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
+ 
+# Copyright (C) 2003  Michael Creel michael.creel@uab.es
+# under the terms of the GNU General Public License.
+# The GPL license is in the file COPYING
+# 
+# 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