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package de.lmu.ifi.dbs.elki.math;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
import de.lmu.ifi.dbs.elki.JUnit4Test;
/*
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/>.
*/
public class TestSinCosTable implements JUnit4Test {
@Test
public void testSinCosTable() {
doTestSinCosTable(360);
doTestSinCosTable(142); // Divisible by two
doTestSinCosTable(17);
doTestSinCosTable(131); // Prime.
}
protected void doTestSinCosTable(int steps) {
SinCosTable table = SinCosTable.make(steps);
for (int i = -steps; i < 2 * steps; i++) {
double angle = Math.toRadians(360. * i / steps);
assertEquals("Cosine does not match at i=" + i + " a=" + angle, Math.cos(angle), table.cos(i), 1E-10);
assertEquals("Sine does not match at i=" + i + " a=" + angle, Math.sin(angle), table.sin(i), 1E-10);
}
}
}
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