--- a
+++ b/inst/nls_obj_nodes.m
@@ -0,0 +1,37 @@
+# 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, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+# This is for internal use by nls_estimate
+
+
+function contrib = nls_obj_nodes(theta, data, model, modelargs, nn)
+	global NEWORLD NSLAVES
+	# Who am I?
+	[info, rank] = MPI_Comm_rank(NEWORLD); 
+	
+	if rank == 0 # Do this if I'm master
+		startblock = NSLAVES*nn + 1;
+		endblock = rows(data);
+	else	# this is for the slaves
+		startblock = rank*nn-nn+1;
+		endblock = rank*nn;
+	endif	
+	
+	data = data(startblock:endblock,:);
+	contrib = feval(model, theta, data, modelargs);
+	contrib = sum(contrib);
+	
+endfunction