java - 智能算法在范围内随机化 Double 但有赔率

Question

我使用以下函数生成特定范围内的随机 double 值:

nextDouble(1.50, 7.00)

但是，我一直在尝试提出一种算法，使随机化生成接近 1.50 的 double 的概率高于生成接近 7.00 的 double 的概率。但我什至不知道它从哪里开始。想到什么了吗？

也欢迎使用 Java。

Answer 1

你应该从发现什么开始probability distribution你需要。根据您的要求，并假设随机数生成是独立的，可能是 Poisson distribution是你要找的:

a call center receives an average of 180 calls per hour, 24 hours a day. The calls are independent; receiving one does not change the probability of when the next one will arrive. The number of calls received during any minute has a Poisson probability distribution with mean 3: the most likely numbers are 2 and 3 but 1 and 4 are also likely and there is a small probability of it being as low as zero and a very small probability it could be 10.

通常的概率分布已经在库中实现，例如org.apache.commons.math3.distribution.PoissonDistribution in Apache Commons Math3 .