/*
* 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.jet.random;
import org.apache.mahout.common.RandomUtils;
import org.apache.mahout.math.MahoutTestCase;
import org.junit.Test;
import java.util.Random;
public final class NormalTest extends MahoutTestCase {
private final double[] breaks =
{-1.2815516, -0.8416212, -0.5244005, -0.2533471, 0.0000000, 0.2533471, 0.5244005, 0.8416212, 1.2815516};
private final double[] quantiles = {0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9};
@Test
public void testCdf() {
Random gen = RandomUtils.getRandom();
double offset = 0;
double scale = 1;
for (int k = 0; k < 20; k++) {
Normal dist = new Normal(offset, scale, null);
DistributionChecks.checkCdf(offset, scale, dist, breaks, quantiles);
offset = gen.nextGaussian();
scale = Math.exp(3 * gen.nextGaussian());
}
}
@Test
public void consistency() throws Exception {
Random gen = RandomUtils.getRandom();
double offset = 0;
double scale = 1;
Normal dist = new Normal(offset, scale, RandomUtils.getRandom());
for (int k = 0; k < 20; k++) {
dist.setState(offset, scale);
DistributionChecks.checkDistribution(dist, breaks, offset, scale, 10000);
offset = gen.nextGaussian();
scale = Math.exp(3 * gen.nextGaussian());
}
}
@Test
public void testSetState() throws Exception {
Normal dist = new Normal(0, 1, RandomUtils.getRandom());
dist.setState(1.3, 5.9);
DistributionChecks.checkDistribution(dist, breaks, 1.3, 5.9, 10000);
}
@Test
public void testToString() {
assertEquals("org.apache.mahout.math.jet.random.Normal(m=1.300000, sd=5.900000)",
new Normal(1.3, 5.9, null).toString());
}
}