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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;
import de.lmu.ifi.dbs.elki.math.linearalgebra.pca.weightfunctions.ConstantWeight;
import de.lmu.ifi.dbs.elki.math.linearalgebra.pca.weightfunctions.ErfcStddevWeight;
import de.lmu.ifi.dbs.elki.math.linearalgebra.pca.weightfunctions.ErfcWeight;
import de.lmu.ifi.dbs.elki.math.linearalgebra.pca.weightfunctions.ExponentialWeight;
import de.lmu.ifi.dbs.elki.math.linearalgebra.pca.weightfunctions.GaussStddevWeight;
import de.lmu.ifi.dbs.elki.math.linearalgebra.pca.weightfunctions.GaussWeight;
import de.lmu.ifi.dbs.elki.math.linearalgebra.pca.weightfunctions.LinearWeight;
import de.lmu.ifi.dbs.elki.math.linearalgebra.pca.weightfunctions.WeightFunction;
/**
* JUnit test to assert consistency of a couple of Weight functions
* @author Erich Schubert
*
*/
public class TestWeightFunctions implements JUnit4Test {
/**
* Just a 'boring' value test for completeness.
*/
@Test
public void testGetWeight() {
WeightFunction[] wf = {new ConstantWeight(), new ErfcWeight(), new ErfcStddevWeight(),
new GaussWeight(), new GaussStddevWeight(), new LinearWeight(), new ExponentialWeight()};
double[] at0 = {1.0, 1.0, 1.0, 1.0, 0.3989422804014327, 1.0, 1.0};
double[] at01 = {1.0, 0.8693490686884612, 0.920344325445942, 0.9772372209558107,
0.3969525474770118, 0.91, 0.7943282347242815};
double[] at09 = {1.0, 0.13877499454059491, 0.36812025069351895, 0.15488166189124816,
0.2660852498987548, 0.18999999999999995, 0.12589254117941673};
double[] at10 = {1.0, 0.10000000000000016, 0.317310507862914, 0.10000000000000002,
0.24197072451914337, 0.09999999999999998, 0.10000000000000002};
assert(wf.length == at0.length);
assert(wf.length == at01.length);
assert(wf.length == at09.length);
assert(wf.length == at10.length);
for (int i=0; i < wf.length; i++) {
double val0 = wf[i].getWeight(0, 1, 1);
double val01 = wf[i].getWeight(0.1, 1, 1);
double val09 = wf[i].getWeight(0.9, 1, 1);
double val10 = wf[i].getWeight(1.0, 1, 1);
assertEquals(wf[i].getClass().getSimpleName()+" at 0.0", at0[i], val0, Double.MIN_VALUE);
assertEquals(wf[i].getClass().getSimpleName()+" at 0.1", at01[i], val01, Double.MIN_VALUE);
assertEquals(wf[i].getClass().getSimpleName()+" at 0.9", at09[i], val09, Double.MIN_VALUE);
assertEquals(wf[i].getClass().getSimpleName()+" at 1.0", at10[i], val10, Double.MIN_VALUE);
}
}
}
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