Example usage for org.apache.commons.math3.util MathArrays sortInPlace

Introduction

In this page you can find the example usage for org.apache.commons.math3.util MathArrays sortInPlace.

Prototype

public static void sortInPlace(double[] x, double[]... yList)
        throws DimensionMismatchException, NullArgumentException 

Source Link

Document

Sort an array in ascending order in place and perform the same reordering of entries on other arrays.

Usage

From source file:org.eclipse.january.dataset.DatasetUtils.java

/**
 * Sort in place given dataset and reorder ancillary datasets too
 * @param a dataset to be sorted/*www  .j  a  v  a  2  s .  com*/
 * @param b ancillary datasets
 */
public static void sort(Dataset a, Dataset... b) {
    if (!DTypeUtils.isDTypeNumerical(a.getDType())) {
        throw new UnsupportedOperationException("Sorting non-numerical datasets not supported yet");
    }

    // gather all datasets as double dataset copies
    DoubleDataset s = copy(DoubleDataset.class, a);
    int l = b == null ? 0 : b.length;
    DoubleDataset[] t = new DoubleDataset[l];
    int n = 0;
    for (int i = 0; i < l; i++) {
        if (b[i] != null) {
            if (!DTypeUtils.isDTypeNumerical(b[i].getDType())) {
                throw new UnsupportedOperationException("Sorting non-numerical datasets not supported yet");
            }
            t[i] = copy(DoubleDataset.class, b[i]);
            n++;
        }
    }

    double[][] y = new double[n][];
    for (int i = 0, j = 0; i < l; i++) {
        if (t[i] != null) {
            y[j++] = t[i].getData();
        }
    }

    MathArrays.sortInPlace(s.getData(), y);

    a.setSlice(s);
    for (int i = 0; i < l; i++) {
        if (b[i] != null) {
            b[i].setSlice(t[i]);
        }
    }
}

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