/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.mahout.math.random;
import com.google.common.collect.Lists;
import org.apache.mahout.common.RandomUtils;
import org.apache.mahout.math.MahoutTestCase;
import org.junit.Assert;
import org.junit.Test;
import java.util.Collections;
import java.util.List;
public class EmpiricalTest extends MahoutTestCase {
@Test
public void testSimpleDist() {
RandomUtils.useTestSeed();
Empirical z = new Empirical(true, true, 3, 0, 1, 0.5, 2, 1, 3.0);
List<Double> r = Lists.newArrayList();
for (int i = 0; i < 10001; i++) {
r.add(z.sample());
}
Collections.sort(r);
assertEquals(2.0, r.get(5000), 0.15);
}
@Test
public void testZeros() {
Empirical z = new Empirical(true, true, 3, 0, 1, 0.5, 2, 1, 3.0);
assertEquals(-16.52, z.sample(0), 1.0e-2);
assertEquals(20.47, z.sample(1), 1.0e-2);
}
@Test
public void testBadArguments() {
try {
new Empirical(true, false, 20, 0, 1, 0.5, 2, 0.9, 9, 0.99, 10.0);
Assert.fail("Should have caught that");
} catch (IllegalArgumentException e) {
}
try {
new Empirical(false, true, 20, 0.1, 1, 0.5, 2, 0.9, 9, 1, 10.0);
Assert.fail("Should have caught that");
} catch (IllegalArgumentException e) {
}
try {
new Empirical(true, true, 20, -0.1, 1, 0.5, 2, 0.9, 9, 1, 10.0);
Assert.fail("Should have caught that");
} catch (IllegalArgumentException e) {
}
try {
new Empirical(true, true, 20, 0, 1, 0.5, 2, 0.9, 9, 1.2, 10.0);
Assert.fail("Should have caught that");
} catch (IllegalArgumentException e) {
}
try {
new Empirical(true, true, 20, 0, 1, 0.5, 2, 0.4, 9, 1, 10.0);
Assert.fail("Should have caught that");
} catch (IllegalArgumentException e) {
}
}
}