Example usage for org.apache.commons.math3.stat StatUtils sumDifference

Introduction

In this page you can find the example usage for org.apache.commons.math3.stat StatUtils sumDifference.

Prototype

public static double sumDifference(final double[] sample1, final double[] sample2)
        throws DimensionMismatchException, NoDataException 

Source Link

Document

Returns the sum of the (signed) differences between corresponding elements of the input arrays -- i.e., sum(sample1[i] - sample2[i]).

Usage

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

@Override
public Object doWork(Object first, Object second) throws IOException {
    if (null == first) {
        throw new IOException(String.format(Locale.ROOT,
                "Invalid expression %s - null found for the first value", toExpression(constructingFactory)));
    }/* w  w  w .  j av a2  s . c o m*/
    if (null == second) {
        throw new IOException(String.format(Locale.ROOT,
                "Invalid expression %s - null found for the second value", toExpression(constructingFactory)));
    }
    if (!(first instanceof List<?>)) {
        throw new IOException(String.format(Locale.ROOT,
                "Invalid expression %s - found type %s for the first value, expecting a list of numbers",
                toExpression(constructingFactory), first.getClass().getSimpleName()));
    }
    if (!(second instanceof List<?>)) {
        throw new IOException(String.format(Locale.ROOT,
                "Invalid expression %s - found type %s for the second value, expecting a list of numbers",
                toExpression(constructingFactory), first.getClass().getSimpleName()));
    }

    return StatUtils.sumDifference(
            ((List) first).stream().mapToDouble(value -> ((BigDecimal) value).doubleValue()).toArray(),
            ((List) second).stream().mapToDouble(value -> ((BigDecimal) value).doubleValue()).toArray());
}

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