Example usage for org.apache.commons.collections.primitives DoubleList toArray

Introduction

In this page you can find the example usage for org.apache.commons.collections.primitives DoubleList toArray.

Prototype

double[] toArray();

Source Link

Document

Returns an array containing all of my elements.

Usage

From source file:cz.cuni.lf1.lge.ThunderSTORM.results.ModifiedLoess.java

/**
 * Compute an interpolating function by performing a loess fit
 * on the data at the original abscissae and then building a cubic spline
 * with a//from   ww  w  .j av  a  2  s. co m
 * {@link org.apache.commons.math3.analysis.interpolation.SplineInterpolator}
 * on the resulting fit.
 *
 * @param xval the arguments for the interpolation points
 * @param yval the values for the interpolation points
 * @return A cubic spline built upon a loess fit to the data at the original abscissae
 * @throws NonMonotonicSequenceException if {@code xval} not sorted in
 * strictly increasing order.
 * @throws DimensionMismatchException if {@code xval} and {@code yval} have
 * different sizes.
 * @throws NoDataException if {@code xval} or {@code yval} has zero size.
 * @throws NotFiniteNumberException if any of the arguments and values are
 * not finite real numbers.
 * @throws NumberIsTooSmallException if the bandwidth is too small to
 * accomodate the size of the input data (i.e. the bandwidth must be
 * larger than 2/n).
 */
public final PolynomialSplineFunction interpolate(double[] xval, double[] yval)
        throws NonMonotonicSequenceException, DimensionMismatchException, NoDataException,
        NotFiniteNumberException, NumberIsTooSmallException {
    double[] smoothed = smooth(xval, yval);
    DoubleList newX = new ArrayDoubleList();
    DoubleList newSmoothed = new ArrayDoubleList();
    newX.add(xval[0]);
    newSmoothed.add(smoothed[0]);
    for (int i = 1; i < xval.length; i++) {
        if (xval[i] != xval[i - 1]) {
            newX.add(xval[i]);
            newSmoothed.add(smoothed[i]);
        }
    }
    xval = newX.toArray();
    smoothed = newSmoothed.toArray();

    return new SplineInterpolator().interpolate(xval, smoothed);
}

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