Github user kinow commented on a diff in the pull request:
https://github.com/apache/commons-rng/pull/5#discussion_r143630148
--- Diff:
commons-rng-sampling/src/main/java/org/apache/commons/rng/sampling/distribution/ZigguratGaussianSampler.java
---
@@ -0,0 +1,152 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file 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 KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.commons.rng.sampling.distribution;
+
+import org.apache.commons.rng.UniformRandomProvider;
+
+/**
+ * Gaussian Sampling by
+ * <a href="https://en.wikipedia.org/wiki/Ziggurat_algorithm";>Ziggurat
algorithm</a>
+ *
+ * <p>Based on
+ * "The Ziggurat Method for Generating Random Variables"<br>
+ * by George Marsaglia and Wai Wan Tsang</p>
+ *
+ * @see <a
href="http://www.jstatsoft.org/article/view/v005i08/ziggurat.pdf";>Ziggurat
Method for Generating Random Variables</a>
+ *
+ * @since 1.1
+ */
+
+public class ZigguratGaussianSampler
+ extends SamplerBase
+ implements NormalizedGaussianSampler {
+
+ /**
+ * Generates values from Gaussian (normal) probability distribution
+ * It uses two tables, integers KN and reals WN. Some 99% of the time,
+ * the required x is produced by:
+ * generate a random 32-bit integer j and let i be the index formed
from
+ * the rightmost 8 bits of j. If j < k_i return x = j * w_i.
+ */
+
+ private static final int[] KN = new int[128];
+ private static final double[] WN = new double[128];
+ private static final double[] FN = new double[128];
--- End diff --
We need Javadocs for these fields. Even though there is a comment above KN,
that's treated only as KN's comment. Perhaps one simple, short, comment for
each KN, WN, and FN variables.
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