--- /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/>.
+
+# usage:
+# [theta, obj_value, conv, iters] = mle_estimate(theta, data, model, modelargs, control, nslaves)
+#
+# inputs:
+# theta: column vector of model parameters
+# data: data matrix
+# model: name of function that computes log-likelihood
+# modelargs: (cell) additional inputs needed by model. May be empty ("")
+# control: (optional) BFGS or SA controls (see bfgsmin and samin). May be empty ("").
+# nslaves: (optional) number of slaves if executed in parallel (requires MPITB)
+#
+# outputs:
+# theta: ML estimated value of parameters
+# obj_value: the value of the log likelihood function at ML estimate
+# conv: return code from bfgsmin (1 means success, see bfgsmin for details)
+# iters: number of BFGS iteration used
+#
+# please see mle_example.m for examples of how to use this
+function [theta, obj_value, convergence, iters] = mle_estimate(theta, data, model, modelargs, control, nslaves)
+
+
+ if nargin < 3
+ error("mle_estimate: 3 arguments required");
+ endif
+
+ if nargin < 4 modelargs = {}; endif # create placeholder if not used
+ if !iscell(modelargs) modelargs = {}; endif # default controls if receive placeholder
+ if nargin < 5 control = {-1,0,1,1}; endif # default controls and method
+ if !iscell(control) control = {-1,0,1,1}; endif # default controls if receive placeholder
+ if nargin < 6 nslaves = 0; endif
+ if nslaves > 0
+ global NSLAVES PARALLEL NEWORLD TAG;
+ LAM_Init(nslaves);
+ # Send the data to all nodes
+ NumCmds_Send({"data", "model", "modelargs"}, {data, model, modelargs});
+ endif
+
+ # bfgs or sa?
+ if (size(control,1)*size(control,2) == 0) # use default bfgs if no control
+ control = {Inf,0,1,1};
+ method = "bfgs";
+ elseif (size(control,1)*size(control,2) < 11)
+ method = "bfgs";
+ else method = "sa";
+ endif
+
+ # do estimation using either bfgsmin or samin
+ if strcmp(method, "bfgs")
+ [theta, obj_value, convergence, iters] = bfgsmin("mle_obj", {theta, data, model, modelargs, nslaves}, control);
+ elseif strcmp(method, "sa")
+ [theta, obj_value, convergence] = samin("mle_obj", {theta, data, model, modelargs, nslaves}, control);
+ endif
+
+ if nslaves > 0
+ LAM_Finalize;
+ endif # cleanup
+ obj_value = - obj_value; # recover from minimization rather than maximization
+endfunction