Example usage for org.apache.commons.math3.analysis.interpolation DividedDifferenceInterpolator DividedDifferenceInterpolator

Introduction

In this page you can find the example usage for org.apache.commons.math3.analysis.interpolation DividedDifferenceInterpolator DividedDifferenceInterpolator.

Prototype

DividedDifferenceInterpolator

Source Link

Usage

From source file:org.meteoinfo.math.interpolate.InterpUtil.java

/**
 * Make interpolation function//from   w  w  w.j av a2  s  .  c o m
 * @param x X data
 * @param y Y data
 * @param kind Specifies the kind of interpolation as a string (linear, 'spline').
 * @return Interpolation function
 */
public static UnivariateFunction getInterpFunc(Array x, Array y, String kind) {
    double[] xd = (double[]) ArrayUtil.copyToNDJavaArray(x);
    double[] yd = (double[]) ArrayUtil.copyToNDJavaArray(y);
    UnivariateInterpolator li;
    switch (kind) {
    case "spline":
    case "cubic":
        li = new SplineInterpolator();
        break;
    case "akima":
        li = new AkimaSplineInterpolator();
        break;
    case "divided":
        li = new DividedDifferenceInterpolator();
        break;
    case "loess":
        li = new LoessInterpolator();
        break;
    case "neville":
        li = new NevilleInterpolator();
        break;
    default:
        li = new LinearInterpolator();
        break;
    }
    UnivariateFunction psf = li.interpolate(xd, yd);

    return psf;
}

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