Example usage for org.apache.commons.math3.optimization PointValuePair getPointRef

Introduction

In this page you can find the example usage for org.apache.commons.math3.optimization PointValuePair getPointRef.

Prototype

public double[] getPointRef() 

Source Link

Document

Gets a reference to the point.

Usage

From source file:edu.byu.nlp.math.optimize.NewtonRaphson.java

/** {@inheritDoc} */
@Override/*from www  .j  a  va  2  s.  co m*/
public PointValuePair optimize(int maxEval, DifferentiableMultivariateFunction f, GoalType goalType,
        double[] initial) {
    Preconditions.checkArgument(maxEval > 0);
    Preconditions.checkNotNull(f);
    Preconditions.checkNotNull(goalType);
    Preconditions.checkNotNull(initial);

    // FIXME : goalType is being ignored!

    Updater updater = Updater.newUpdater(f);

    PointValuePair prev = null;
    PointValuePair next = updater.update(initial);
    logger.info(String.format("Iteration 0, value = %f", next.getValue()));

    evaluations = 1;
    do {
        prev = next;
        double[] x = prev.getPointRef();
        next = updater.update(x);
        ++evaluations;
        logger.info(String.format("Iteration %d, value = %f", evaluations, next.getValue()));
    } while (!convergenceChecker.converged(evaluations, prev, next) && evaluations < maxEval
            && evaluations < maxEvaluations);

    return next;
}

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