为javascript编写一个真正包容的随机方法 [英] Write a truly inclusive random method for javascript

问题描述

Javascript的MATH对象有一个随机方法，从set [0,1）0返回，包括1，exclusive。有没有办法返回一个包含1的真正随机方法。

Javascript's MATH object has a random method that returns from the set [0,1) 0 inclusive, 1 exclusive. Is there a way to return a truly random method that includes 1.

例如

var rand = MATH.random()*2;

if(rand > 1)
{
   rand = MATH.floor(rand);
}

return rand; 

虽然这总是从集合[0,1]返回一个数字，但它并不是真正随机的。 / p>

While this always returns a number from the set [0,1] it is not truly random.

推荐答案

它是否包含边界应该无关紧要;事实上，严格来说，你要做的事情并没有多大意义。请记住，在连续概率分布下，获得特定值的概率无论如何都是无穷小的，所以从数学上讲，你永远不会看到1的确切值。

Whether it's inclusive of the boundaries shouldn't matter; indeed, strictly speaking what you're trying to do doesn't really make sense. Remember that under a continuous probability distribution, the probability of getting a specific value is infinitesimal anyway, so mathematically speaking, you'll never see the exact value of 1.

当然，在计算机世界中，RNG的分布并不是真正连续的，所以你可能会遇到一个特定的价值（无论这意味着什么），但事实上你依赖于一个限制如何存储实数，暗示您解决任何问题的方法存在问题。

Of course, in the world of computers, the distribution of an RNG isn't truly continuous, so it's "possible" that you'll encounter a specific value (whatever that means), but the fact that you're relying on an a limitation of how real numbers are stored hints at problems with your approach to whatever problem you're trying to solve.

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