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The math plugin for underscore-java
There is a newer version: 1.30
/*
 * The MIT License (MIT)
 *
 * Copyright 2015 Valentyn Kolesnikov
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.github.underscore.math;

import java.util.*;

public class $ extends com.github.underscore.$ {
    public $(final Iterable iterable) {
        super(iterable);
    }

    public $(final String string) {
        super(string);
    }

    public static class Chain extends com.github.underscore.$.Chain {
        public Chain(final T item) {
            super(item);
        }
        public Chain(final List list) {
            super(list);
        }

        public  Chain sum() {
            return new Chain($.sum((List) value()));
        }

        public Chain mean() {
            return new Chain($.mean((List) value()));
        }

        public Chain median() {
            return new Chain($.median((List) value()));
        }
    }

    public static  Chain chain(final List list) {
        return new $.Chain(list);
    }

    public static  Chain chain(final Iterable iterable) {
        return new $.Chain(newArrayList(iterable));
    }

    public static  Chain chain(final T[] list) {
        return new $.Chain(Arrays.asList(list));
    }

    public Chain chain() {
        return new $.Chain(newArrayList(value()));
    }

    public static  T sum(final Iterable iterable) {
        T result = null;
        for (final T item : iterable) {
            result = sum(result, item);
        }
        return result;
    }

    public  T sum() {
        return (T) sum((List) getIterable());
    }

    private static  T sum(final T first, final T second) {
        if (first == null) {
            return second;
        } else if (second == null) {
            return first;
        } else if (first instanceof java.math.BigDecimal) {
            return (T) sum((java.math.BigDecimal) first, (java.math.BigDecimal) second);
        } else if (second instanceof java.math.BigInteger) {
            return (T) sum((java.math.BigInteger) first, (java.math.BigInteger) second);
        } else if (first instanceof Byte) {
            return (T) sum((Byte) first, (Byte) second);
        } else if (first instanceof Double) {
            return (T) sum((Double) first, (Double) second);
        } else if (first instanceof Float) {
            return (T) sum((Float) first, (Float) second);
        } else if (first instanceof Integer) {
            return (T) sum((Integer) first, (Integer) second);
        } else if (first instanceof Long) {
            return (T) sum((Long) first, (Long) second);
        } else if (first instanceof Short) {
            return (T) sum((Short) first, (Short) second);
        } else {
            throw new UnsupportedOperationException("Sum only supports official subclasses of Number");
        }
    }

    private static java.math.BigDecimal sum(java.math.BigDecimal first, java.math.BigDecimal second) {
        return first.add(second);
    }

    private static java.math.BigInteger sum(java.math.BigInteger first, java.math.BigInteger second) {
        return first.add(second);
    }

    private static Byte sum(Byte first, Byte second) {
        return (byte) (first + second);
    }

    private static Double sum(Double first, Double second) {
        return first + second;
    }

    private static Float sum(Float first, Float second) {
        return first + second;
    }

    private static Integer sum(Integer first, Integer second) {
        return first + second;
    }

    private static Long sum(Long first, Long second) {
        return first + second;
    }

    private static Short sum(Short first, Short second) {
        return (short) (first + second);
    }

    public static  double mean(final Iterable iterable) {
        T result = null;
        int count = 0;
        for (final T item : iterable) {
            result = sum(result, item);
            count += 1;
        }
        return result.doubleValue() / count;
    }

    public double mean() {
        return mean((Iterable) getIterable());
    }

    public static  double median(final Iterable iterable) {
        final List result = newArrayList((Collection) iterable);
        final int size = size(iterable);
        if (size % 2 != 0) {
            return result.get(size / 2).doubleValue();
        }
        return (result.get(size / 2 - 1).doubleValue() + result.get(size / 2).doubleValue()) / 2;
    }

    public double median() {
        return median((Iterable) getIterable());
    }

    public static void main(String[] args) {
        final String message = "Underscore-java-math is a math plugin for underscore-java.\n\n"
            + "For docs, license, tests, and downloads, see: http://javadev.github.io/underscore-java";
        System.out.println(message);
    }
}