@Test
public void testSamplerHelper2() {
final double tol = 1e-12;
final double[] testValues = {
-1e0, -1e-1, -1e-2, -1e-3, -1e-4, -1e-5, -1e-6, -1e-7, -1e-8, -1e-9, -1e-10, -1e-11, 0.,
1e-11, 1e-10, 1e-9, 1e-8, 1e-7, 1e-6, 1e-5, 1e-4, 1e-3, 1e-2, 1e-1, 1e0
};
for (double testValue : testValues) {
final double expected = FastMath.expm1(testValue);
TestUtils.assertRelativelyEquals(
expected, ZipfRejectionInversionSampler.helper2(testValue) * testValue, tol);
}
}
@Test
public void testSamplerHelper1Minus1() {
Assert.assertEquals(Double.POSITIVE_INFINITY, ZipfRejectionInversionSampler.helper1(-1d), 0d);
}