geogebra.common.kernel.statistics.AlgoInversePoisson.java Source code

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Here is the source code for geogebra.common.kernel.statistics.AlgoInversePoisson.java

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/* 
GeoGebra - Dynamic Mathematics for Everyone
http://www.geogebra.org
    
This file is part of GeoGebra.
    
This program is free software; you can redistribute it and/or modify it 
under the terms of the GNU General Public License as published by 
the Free Software Foundation.
    
 */

package geogebra.common.kernel.statistics;

import geogebra.common.kernel.Construction;
import geogebra.common.kernel.arithmetic.NumberValue;
import geogebra.common.kernel.commands.Commands;

import org.apache.commons.math.distribution.PoissonDistribution;

/**
 * 
 * @author Michael Borcherds
 */

public class AlgoInversePoisson extends AlgoDistribution {

    /**
     * @param cons
     *            construction
     * @param label
     *            label for output
     * @param a
     *            mean
     * @param b
     *            variable value
     */
    public AlgoInversePoisson(Construction cons, String label, NumberValue a, NumberValue b) {
        super(cons, label, a, b, null, null);
    }

    /**
     * @param cons
     *            construction
     * @param a
     *            mean
     * @param b
     *            variable value
     */
    public AlgoInversePoisson(Construction cons, NumberValue a, NumberValue b) {
        super(cons, a, b, null, null);
    }

    @Override
    public Commands getClassName() {
        return Commands.InversePoisson;
    }

    @Override
    public final void compute() {

        if (input[0].isDefined() && input[1].isDefined()) {
            double param = a.getDouble();
            double val = b.getDouble();
            try {
                PoissonDistribution dist = getPoissonDistribution(param);

                double result = dist.inverseCumulativeProbability(val);

                // eg InversePascal[1,1,1] returns 2147483647
                if (result >= Integer.MAX_VALUE)
                    num.setUndefined();
                else
                    num.setValue(result + 1);

            } catch (Exception e) {
                num.setUndefined();
            }
        } else
            num.setUndefined();
    }

}