Example usage for org.apache.commons.math3.distribution MultivariateRealDistribution density

Introduction

In this page you can find the example usage for org.apache.commons.math3.distribution MultivariateRealDistribution density.

Prototype

double density(double[] x);

Source Link

Document

Returns the probability density function (PDF) of this distribution evaluated at the specified point x .

Usage

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

@Override
public Object doWork(Object first, Object second) throws IOException {

    if (!(first instanceof MultivariateRealDistribution)) {
        throw new IOException(String.format(Locale.ROOT,
                "Invalid expression %s - found type %s for the first value, expecting a MultiVariateRealDistribution for density",
                toExpression(constructingFactory), first.getClass().getSimpleName()));
    }//from  w  ww . ja v a2s  .c om
    if (!(second instanceof List)) {
        throw new IOException(String.format(Locale.ROOT,
                "Invalid expression %s - found type %s for the second value, expecting a numeric array.",
                toExpression(constructingFactory), first.getClass().getSimpleName()));
    }

    MultivariateRealDistribution multivariateRealDistribution = (MultivariateRealDistribution) first;
    List<Number> nums = (List<Number>) second;

    double[] vec = new double[nums.size()];

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

    return multivariateRealDistribution.density(vec);
}

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