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package de.lmu.ifi.dbs.elki.math.histograms;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2012
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
import de.lmu.ifi.dbs.elki.JUnit4Test;
import de.lmu.ifi.dbs.elki.utilities.pairs.DoubleObjPair;
/**
* JUnit test to test the {@link ReplacingHistogram} class.
*
* @author Erich Schubert
*/
public class TestReplacingHistogram implements JUnit4Test {
ReplacingHistogram<Double> hist;
/**
* Test that adds some data to the histogram and compares results.
*/
@Test
public final void testHistogram() {
Double[] initial = { 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 };
Double[] filled = { 0.0, 1.23, 4.56, 7.89, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 };
Double[] changed = { 0.0, 1.35, 8.01, 14.67, 9.01, 2.34, 0.0, 0.0, 0.0, 0.0 };
Double[] resized = { -1.23, 0.0, 0.0, 1.35, 8.01, 14.67, 9.01, 2.34, 0.0, 0.0, 0.0, 0.0, 0.0, -4.56 };
hist = ReplacingHistogram.DoubleHistogram(10, 0.0, 1.0);
assertArrayEquals("Empty histogram doesn't match", initial, hist.getData().toArray(new Double[0]));
hist.replace(0.15, 1.23);
hist.replace(0.25, 4.56);
hist.replace(0.35, 7.89);
assertArrayEquals("Filled histogram doesn't match", filled, hist.getData().toArray(new Double[0]));
hist.replace(0.15, 0.12 + hist.get(0.15));
hist.replace(0.25, 3.45 + hist.get(0.25));
hist.replace(0.35, 6.78 + hist.get(0.35));
hist.replace(0.45, 9.01 + hist.get(0.45));
hist.replace(0.50, 2.34 + hist.get(0.50));
assertArrayEquals("Changed histogram doesn't match", changed, hist.getData().toArray(new Double[0]));
hist.replace(-.13, -1.23 + hist.get(-.13));
hist.replace(1.13, -4.56 + hist.get(1.13));
assertArrayEquals("Resized histogram doesn't match", resized, hist.getData().toArray(new Double[0]));
// compare results via Iterator.
int off = 0;
for(DoubleObjPair<Double> pair : hist) {
assertEquals("Array iterator bin position", -0.15 + 0.1 * off, pair.first, 0.00001);
assertEquals("Array iterator bin contents", resized[off], pair.getSecond(), 0.00001);
off++;
}
}
}
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