Example usage for org.apache.commons.math3.analysis.interpolation PiecewiseBicubicSplineInterpolator interpolate

Introduction

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

Prototype

public PiecewiseBicubicSplineInterpolatingFunction interpolate(final double[] xval, final double[] yval,
        final double[][] fval) throws DimensionMismatchException, NullArgumentException, NoDataException,
        NonMonotonicSequenceException 

Source Link

Usage

From source file:org.apache.solr.client.solrj.io.eval.BicubicSplineEvaluator.java

@Override
public Object doWork(Object... objects) throws IOException {

    if (objects.length != 3) {
        throw new IOException(
                "The bicubicSpline function requires three paremeters," + objects.length + " found.");
    }/* w ww .java  2s . com*/

    Object first = objects[0];
    Object second = objects[1];
    Object third = objects[2];

    double[] x = null;
    double[] y = null;
    double[][] grid = null;

    if (first instanceof List && second instanceof List && third instanceof Matrix) {
        List<Number> xlist = (List<Number>) first;
        x = new double[xlist.size()];

        for (int i = 0; i < x.length; i++) {
            x[i] = xlist.get(i).doubleValue();
        }

        List<Number> ylist = (List<Number>) second;
        y = new double[ylist.size()];

        for (int i = 0; i < y.length; i++) {
            y[i] = ylist.get(i).doubleValue();
        }

        Matrix matrix = (Matrix) third;
        grid = matrix.getData();

        PiecewiseBicubicSplineInterpolator interpolator = new PiecewiseBicubicSplineInterpolator();
        BivariateFunction bivariateFunction = interpolator.interpolate(x, y, grid);
        return bivariateFunction;
    } else {
        throw new IOException(
                "The bicubicSpline function expects two numeric arrays and a matrix as parameters.");
    }
}

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