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

Introduction

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

Prototype

public static double[] ebeMultiply(double[] a, double[] b) 

Source Link

Document

Creates an array whose contents will be the element-by-element multiplication of the arguments.

Usage

From source file:org.apache.solr.client.solrj.io.eval.EBEMultiplyEvaluator.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)));
    }//from w ww . ja  va  2  s  . com
    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()));
    }

    double[] result = MathArrays.ebeMultiply(
            ((List) first).stream().mapToDouble(value -> ((BigDecimal) value).doubleValue()).toArray(),
            ((List) second).stream().mapToDouble(value -> ((BigDecimal) value).doubleValue()).toArray());

    List<Number> numbers = new ArrayList();
    for (double d : result) {
        numbers.add(d);
    }

    return numbers;
}

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