Simplify use of "EstimationProblem"
------------------------------------
Key: MATH-165
URL: https://issues.apache.org/jira/browse/MATH-165
Project: Commons Math
Issue Type: Improvement
Reporter: Gilles
Priority: Minor
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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