@Test
public void testSamplerHelper1() {
final double tol = 1e-12;
final double[] testValues = {
FastMath.nextUp(-1.),
-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 (final double testValue : testValues) {
final double expected = FastMath.log1p(testValue);
TestUtils.assertRelativelyEquals(
expected, ZipfRejectionInversionSampler.helper1(testValue) * testValue, tol);
}
}
@Test
public void testSamplerHelper1Minus1() {
Assert.assertEquals(Double.POSITIVE_INFINITY, ZipfRejectionInversionSampler.helper1(-1d), 0d);
}