Example usage for org.apache.commons.math3.fitting AbstractCurveFitter fit

Introduction

In this page you can find the example usage for org.apache.commons.math3.fitting AbstractCurveFitter fit.

Prototype

public double[] fit(Collection<WeightedObservedPoint> points) 

Source Link

Document

Fits a curve.

Usage

From source file:org.orekit.utils.SecularAndHarmonic.java

/** Fit parameters.
 * @see #getFittedParameters()/*from   w ww. ja  va2  s. c  o m*/
 */
public void fit() {

    final AbstractCurveFitter fitter = new AbstractCurveFitter() {
        /** {@inheritDoc} */
        @Override
        protected LeastSquaresProblem getProblem(final Collection<WeightedObservedPoint> observations) {
            // Prepare least-squares problem.
            final int len = observations.size();
            final double[] target = new double[len];
            final double[] weights = new double[len];

            int i = 0;
            for (final WeightedObservedPoint obs : observations) {
                target[i] = obs.getY();
                weights[i] = obs.getWeight();
                ++i;
            }

            final AbstractCurveFitter.TheoreticalValuesFunction model = new AbstractCurveFitter.TheoreticalValuesFunction(
                    new LocalParametricFunction(), observations);

            // build a new least squares problem set up to fit a secular and harmonic curve to the observed points
            return new LeastSquaresBuilder().maxEvaluations(Integer.MAX_VALUE).maxIterations(Integer.MAX_VALUE)
                    .start(fitted).target(target).weight(new DiagonalMatrix(weights))
                    .model(model.getModelFunction(), model.getModelFunctionJacobian()).build();

        }
    };

    fitted = fitter.fit(observedPoints);

}

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