/**
* Copyright (C) 2009 - 2009 by OpenGamma Inc.
*
* Please see distribution for license.
*/
package com.opengamma.analytics.math.integration;
import org.testng.annotations.Test;
import com.opengamma.util.test.TestGroup;
/**
* Test.
*/
@Test(groups = TestGroup.UNIT)
public class GaussHermiteWeightAndAbscissaFunctionTest extends WeightAndAbscissaFunctionTestCase {
private static final double SQRT_PI = Math.sqrt(Math.PI);
private static final double DENOM1 = 4 * (3 - Math.sqrt(6));
private static final double DENOM2 = 4 * (3 + Math.sqrt(6));
private static final double[] X2 = new double[] {-Math.sqrt(2) / 2., Math.sqrt(2) / 2.};
private static final double[] W2 = new double[] {SQRT_PI / 2., SQRT_PI / 2.};
private static final double[] X3 = new double[] {-Math.sqrt(6) / 2., 0, Math.sqrt(6) / 2.};
private static final double[] W3 = new double[] {SQRT_PI / 6., 2 * SQRT_PI / 3., SQRT_PI / 6.};
private static final double[] X4 = new double[] {-Math.sqrt((3 + Math.sqrt(6)) / 2.), -Math.sqrt((3 - Math.sqrt(6)) / 2.), Math.sqrt((3 - Math.sqrt(6)) / 2.), Math.sqrt((3 + Math.sqrt(6)) / 2.)};
private static final double[] W4 = new double[] {SQRT_PI / DENOM2, SQRT_PI / DENOM1, SQRT_PI / DENOM1, SQRT_PI / DENOM2};
private static final QuadratureWeightAndAbscissaFunction F = new GaussHermiteWeightAndAbscissaFunction();
@Override
protected QuadratureWeightAndAbscissaFunction getFunction() {
return F;
}
@Test
public void test() {
assertResults(F.generate(2), X2, W2);
assertResults(F.generate(3), X3, W3);
assertResults(F.generate(4), X4, W4);
}
}