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From "Luc Maisonobe (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (MATH-165) Simplify use of "EstimationProblem"
Date Sun, 19 Aug 2007 10:13:30 GMT

     [ https://issues.apache.org/jira/browse/MATH-165?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Luc Maisonobe resolved MATH-165.
--------------------------------

    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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