--- /dev/null
+# Copyright (C) 2003,2004,2005 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/>.
+
+# for internal use by gmm_estimate
+
+
+# average moments (separate function so it can be differentiated)
+function m = average_moments(theta, data, moments, momentargs)
+
+ global NSLAVES PARALLEL NEWORLD NSLAVES TAG;
+
+ n = rows(data);
+
+ if PARALLEL
+ nn = floor(n/(NSLAVES + 1)); # save some work for master
+
+ # The command that the slave nodes will execute
+ cmd=['contrib = sum_moments_nodes(theta, data, moments, momentargs, nn); ',...
+ 'MPI_Send(contrib,0,TAG,NEWORLD);'];
+
+ # send items to slaves
+ NumCmds_Send({"theta", "nn", "cmd"},{theta, nn, cmd});
+
+ # evaluate last block on master while slaves are busy
+ m = feval("sum_moments_nodes", theta, data, moments, momentargs, nn);
+
+ # collect slaves' results
+ contrib = zeros(1,columns(m));
+ for i = 1:NSLAVES
+ MPI_Recv(contrib,i,TAG,NEWORLD);
+ m = m + contrib;
+ endfor
+
+ m = m'; # we want a column vector, please
+ m = m/n; # average please, not sum
+
+ else # serial version
+ m = feval(moments, theta, data, momentargs);
+ m = mean(m)'; # returns Gx1 moment vector
+ endif
+
+endfunction