/**
* Copyright (C) 2009 - present by OpenGamma Inc. and the OpenGamma group of companies
*
* Please see distribution for license.
*/
package com.opengamma.analytics.math.function.special;
import static org.testng.AssertJUnit.assertEquals;
import org.testng.annotations.Test;
import cern.jet.random.engine.MersenneTwister;
import cern.jet.random.engine.MersenneTwister64;
import cern.jet.random.engine.RandomEngine;
import com.opengamma.analytics.math.function.Function1D;
import com.opengamma.util.test.TestGroup;
/**
* Test.
*/
@Test(groups = TestGroup.UNIT)
public class GammaFunctionTest {
private static final RandomEngine RANDOM = new MersenneTwister64(MersenneTwister.DEFAULT_SEED);
private static final Function1D<Double, Double> GAMMA = new GammaFunction();
private static final Function1D<Double, Double> LN_GAMMA = new NaturalLogGammaFunction();
private static final double EPS = 1e-9;
@Test
public void test() {
final double x = RANDOM.nextDouble();
assertEquals(Math.log(GAMMA.evaluate(x)), LN_GAMMA.evaluate(x), EPS);
}
}