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https://issues.apache.org/jira/browse/MATH-165?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Luc Maisonobe resolved MATH-165.
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Resolution: Fixed
For now, the implementation only handles data storage, some improvements may be
added later, probably after 1.2 has been released.
> Simplify use of "EstimationProblem"
> ------------------------------------
>
> Key: MATH-165
> URL: https://issues.apache.org/jira/browse/MATH-165
> Project: Commons Math
> Issue Type: Improvement
> Reporter: Gilles
> Assignee: Luc Maisonobe
> Priority: Minor
> Fix For: 1.2
>
>
> The use of the "EstimationProblem" interface could be simplified by providing
> a helper (abstract) class that would implement
> the "getMeasurements" "getAllParameters" and "getUnboundParameters" methods.
> Currently, each new implementation of the interface has to do it even if they
> are typically only called from the "Estimator" class (and not by the user
> code).
> That same helper class could also take care of storing the partial
> derivatives.
> A skeleton for the requested class could be as follows:
> public abstract class SimpleEstimationProblem
> implements EstimationProblem {
> // ... storage for measurements and partial derivatives ...
>
> protected void addParameter(EstimatedParameter p,
> ComputableFunction partial,
> boolean isBound) {
> // ...
> }
> protected void addParameter(EstimatedParameter p,
> ComputableFunction partial) {
> addParameter(p, partial, false);
> }
> protected double getPartial(EstimatedParameter p,
> double x) {
> // ...
> }
> protected void addMeasurement(WeightedMeasurement m) {
> _observations.add(m);
> }
> public WeightedMeasurement[] getMeasurements() {
> // ...
> }
> public EstimatedParameter[] getAllParameters() {
> // ...
> }
> public EstimatedParameter[] getUnboundParameters() {
> // ...
> }
> }
> Best,
> Gilles
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