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//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
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//specific language governing permissions and limitations
//under the License.
package org.apache.commons.math4.random;
import org.apache.commons.math4.random.GaussianRandomGenerator;
import org.apache.commons.rng.simple.RandomSource;
import org.apache.commons.math4.stat.StatUtils;
import org.junit.Assert;
import org.junit.Test;
public class GaussianRandomGeneratorTest {
@Test
public void testMeanAndStandardDeviation() {
GaussianRandomGenerator generator = new GaussianRandomGenerator(RandomSource.create(RandomSource.MT, 17399225432l));
double[] sample = new double[10000];
for (int i = 0; i < sample.length; ++i) {
sample[i] = generator.nextNormalizedDouble();
}
Assert.assertEquals(0.0, StatUtils.mean(sample), 0.012);
Assert.assertEquals(1.0, StatUtils.variance(sample), 0.01);
}
}