从Java中的gamma分布生成随机值

Question

如何从Java中的gamma分布生成数字？

Answer 1

来自Apache Commons-Math软件包的GammaDistribution：

double sample = new GammaDistribution(shape, scale).sample();

Answer 2

Apache Commons Math 3.3 API有可能

GammaDistribution(double shape, double scale)
// Creates a new gamma distribution with specified values of the shape and scale parameters.
GammaDistribution(double shape, double scale, double inverseCumAccuracy)
// Creates a new gamma distribution with specified values of the shape and scale parameters.
GammaDistribution(RandomGenerator rng, double shape, double scale)
// Creates a Gamma distribution.
GammaDistribution(RandomGenerator rng, double shape, double scale, double inverseCumAccuracy)
// Creates a Gamma distribution.

参考：http://commons.apache.org/proper/commons-math/apidocs/org/apache/commons/math3/distribution/GammaDistribution.html