1 package org.djutils.means;
2
3 /**
4 * Compute arithmetic (weighted) mean of a set of values.
5 * <p>
6 * Copyright (c) 2013-2016 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
7 * BSD-style license. See <a href="https://djutils.org/docs/current/djutils/licenses.html">DJUTILS License</a>.
8 * <p>
9 * @version $Revision$, $LastChangedDate$, by $Author$, initial version Oct 26, 2018 <br>
10 * @author <a href="https://www.tudelft.nl/averbraeck">Alexander Verbraeck</a>
11 * @author <a href="https://www.tudelft.nl/staff/p.knoppers/">Peter Knoppers</a>
12 * @param <V> value type
13 * @param <W> weight type
14 */
15 public class ArithmeticMean<V extends Number, W extends Number> extends AbstractMean<ArithmeticMean<V, W>, V, W>
16 {
17 /** {@inheritDoc} */
18 @Override
19 public final double getMean()
20 {
21 return getSum() / getSumOfWeights();
22 }
23
24 /** {@inheritDoc} */
25 @Override
26 public final ArithmeticMean<V, W> addImpl(final V value, final Number weight)
27 {
28 increment(weight.doubleValue() * value.doubleValue(), weight.doubleValue());
29 return this;
30 }
31
32 /** {@inheritDoc} */
33 @Override
34 public final String toString()
35 {
36 return "ArithmeticMean [current sum=" + getSum() + ", current sum of weights=" + getSumOfWeights()
37 + ", current arithmetic mean=" + getMean() + "]";
38 }
39
40 }