RNG-43: Use new class.
Project: http://git-wip-us.apache.org/repos/asf/commons-rng/repo Commit: http://git-wip-us.apache.org/repos/asf/commons-rng/commit/c76bd300 Tree: http://git-wip-us.apache.org/repos/asf/commons-rng/tree/c76bd300 Diff: http://git-wip-us.apache.org/repos/asf/commons-rng/diff/c76bd300 Branch: refs/heads/master Commit: c76bd300351e1e6e2a15a1ae2b1015a1b979d679 Parents: adcf0c5 Author: Gilles <er...@apache.org> Authored: Wed Jan 10 17:32:39 2018 +0100 Committer: Gilles <er...@apache.org> Committed: Wed Jan 10 17:32:39 2018 +0100 ---------------------------------------------------------------------- .../distribution/BoxMullerLogNormalSampler.java | 37 +++++--------------- 1 file changed, 8 insertions(+), 29 deletions(-) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/commons-rng/blob/c76bd300/commons-rng-sampling/src/main/java/org/apache/commons/rng/sampling/distribution/BoxMullerLogNormalSampler.java ---------------------------------------------------------------------- diff --git a/commons-rng-sampling/src/main/java/org/apache/commons/rng/sampling/distribution/BoxMullerLogNormalSampler.java b/commons-rng-sampling/src/main/java/org/apache/commons/rng/sampling/distribution/BoxMullerLogNormalSampler.java index 354b8d4..1db0b7c 100644 --- a/commons-rng-sampling/src/main/java/org/apache/commons/rng/sampling/distribution/BoxMullerLogNormalSampler.java +++ b/commons-rng-sampling/src/main/java/org/apache/commons/rng/sampling/distribution/BoxMullerLogNormalSampler.java @@ -19,42 +19,21 @@ package org.apache.commons.rng.sampling.distribution; import org.apache.commons.rng.UniformRandomProvider; /** - * <a href="https://en.wikipedia.org/wiki/Box%E2%80%93Muller_transform";> - * Box-Muller algorithm</a> for sampling from a Log normal distribution. + * Sampling from a <a href="https://en.wikipedia.org/wiki/Log-normal_distribution";> + * log-normal distribution</a>. + * Uses {@link BoxMullerNormalizedGaussianSampler} as the underlying sampler. */ public class BoxMullerLogNormalSampler - extends SamplerBase - implements ContinuousSampler { - /** Scale. */ - private final double scale; - /** Shape. */ - private final double shape; - /** Gaussian sampling. */ - private final NormalizedGaussianSampler gaussian; - + extends LogNormalSampler { /** * @param rng Generator of uniformly distributed random numbers. - * @param scale Scale of the Log normal distribution. - * @param shape Shape of the Log normal distribution. + * @param scale Scale of the log-normal distribution. + * @param shape Shape of the log-normal distribution. */ public BoxMullerLogNormalSampler(UniformRandomProvider rng, double scale, double shape) { - super(null); // Not used. - this.scale = scale; - this.shape = shape; - gaussian = new BoxMullerNormalizedGaussianSampler(rng); - } - - /** {@inheritDoc} */ - @Override - public double sample() { - return Math.exp(scale + shape * gaussian.sample()); - } - - /** {@inheritDoc} */ - @Override - public String toString() { - return "Box-Muller Log Normal [" + gaussian.toString() + "]"; + super(new BoxMullerNormalizedGaussianSampler(rng), + scale, shape); } }
