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

Introduction

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

Prototype

public static double[] normalizeArray(double[] values, double normalizedSum)
        throws MathIllegalArgumentException, MathArithmeticException 

Source Link

Document

Normalizes an array to make it sum to a specified value.

Usage

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

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

    Object value = values[0];//from  ww w .j av  a  2 s .c  o m

    double sumTo = 1.0;

    if (values.length == 2) {
        Number n = (Number) values[1];
        sumTo = n.doubleValue();
    }

    if (null == value) {
        return null;
    } else if (value instanceof Matrix) {
        Matrix matrix = (Matrix) value;

        double[][] data = matrix.getData();
        double[][] unitData = new double[data.length][];
        for (int i = 0; i < data.length; i++) {
            double[] row = data[i];
            double[] unitRow = MathArrays.normalizeArray(row, sumTo);
            unitData[i] = unitRow;
        }

        return new Matrix(unitData);
    } else if (value instanceof List) {
        List<Number> vals = (List<Number>) value;
        double[] doubles = new double[vals.size()];
        for (int i = 0; i < doubles.length; i++) {
            doubles[i] = vals.get(i).doubleValue();
        }

        List<Number> unitList = new ArrayList(doubles.length);
        double[] unitArray = MathArrays.normalizeArray(doubles, sumTo);
        for (double d : unitArray) {
            unitList.add(d);
        }

        return unitList;
    } else {
        throw new IOException("The unit function expects either a numeric array or matrix as a parameter");
    }
}

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