Author: luc
Date: Fri Aug 17 09:26:45 2007
New Revision: 567080
URL: http://svn.apache.org/viewvc?view=rev&rev=567080
Log:
[MATH-165] basic implementation of a SimpleEstimationProblem
Added:
commons/proper/math/trunk/src/java/org/apache/commons/math/estimation/SimpleEstimationProblem.java
(with props)
Added:
commons/proper/math/trunk/src/java/org/apache/commons/math/estimation/SimpleEstimationProblem.java
URL:
http://svn.apache.org/viewvc/commons/proper/math/trunk/src/java/org/apache/commons/math/estimation/SimpleEstimationProblem.java?view=auto&rev=567080
==============================================================================
---
commons/proper/math/trunk/src/java/org/apache/commons/math/estimation/SimpleEstimationProblem.java
(added)
+++
commons/proper/math/trunk/src/java/org/apache/commons/math/estimation/SimpleEstimationProblem.java
Fri Aug 17 09:26:45 2007
@@ -0,0 +1,72 @@
+package org.apache.commons.math.estimation;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+
+/**
+ * Simple implementation of the [EMAIL PROTECTED] EstimationProblem
+ * EstimationProblem} interface for boilerplate data handling.
+ * <p>This class <em>only</em> handles parameters and measurements
+ * storage and unbound parameters filtering. It does not compute
+ * anything by itself. It should either be used with measurements
+ * implementation that are smart enough to know about the
+ * various parameters in order to compute the partial derivatives
+ * appropriately. Since the problem-specific logic is mainly related to
+ * the various measurements models, the simplest way to use this class
+ * is by extending it and using one internal class extending
+ * [EMAIL PROTECTED] WeightedMeasurement WeightedMeasurement} for each
measurement
+ * type. The instances of the internal classes would have access to the
+ * various parameters and their current estimate.</p>
+ */
+public class SimpleEstimationProblem implements EstimationProblem {
+
+ /**
+ * Build an empty instance without parameters nor measurements.
+ */
+ public SimpleEstimationProblem() {
+ parameters = new ArrayList();
+ }
+
+ public EstimatedParameter[] getAllParameters() {
+ return (EstimatedParameter[]) parameters.toArray(new
EstimatedParameter[parameters.size()]);
+ }
+
+ public EstimatedParameter[] getUnboundParameters() {
+
+ // filter the unbound parameters
+ ArrayList unbound = new ArrayList(parameters.size());
+ for (Iterator iterator = parameters.iterator(); iterator.hasNext();) {
+ EstimatedParameter p = (EstimatedParameter) iterator.next();
+ if (! p.isBound()) {
+ unbound.add(p);
+ }
+ }
+
+ // convert to an array
+ return (EstimatedParameter[]) unbound.toArray(new
EstimatedParameter[unbound.size()]);
+
+ }
+
+ public WeightedMeasurement[] getMeasurements() {
+ return (WeightedMeasurement[]) measurements.toArray(new
WeightedMeasurement[measurements.size()]);
+ }
+
+ protected void addParameter(EstimatedParameter p) {
+ parameters.add(p);
+ }
+
+ /**
+ * Add a new measurement to the set.
+ * @param m measurement to add
+ */
+ protected void addMeasurement(WeightedMeasurement m) {
+ measurements.add(m);
+ }
+
+ /** Estimated parameters. */
+ private ArrayList parameters;
+
+ /** Measurements. */
+ private ArrayList measurements;
+
+}
Propchange:
commons/proper/math/trunk/src/java/org/apache/commons/math/estimation/SimpleEstimationProblem.java
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svn:eol-style = native
