生成3个随机数，它们在R中的总和为1 [英] Generate 3 random number that sum to 1 in R

问题描述

我希望创建3个(非负)准随机数，它们加起来等于1，并一遍又一遍地重复.

I am hoping to create 3 (non-negative) quasi-random numbers that sum to one, and repeat over and over.

基本上，我试图在许多试验中将某物分成三个随机部分.

Basically I am trying to partition something into three random parts over many trials.

虽然我知道

a = runif(3,0,1)

我本以为可以在下一个runif中将1-a用作最大值，但这似乎很混乱.

I was thinking that I could use 1-a as the max in the next runif, but it seems messy.

但是这些当然不等于一.有什么想法，哦，明智的stackoverflow-ers?

But these of course don't sum to one. Any thoughts, oh wise stackoverflow-ers?

推荐答案

仅从(0，1)中随机抽取2位数字，如果假设其a和b，则得到:

just random 2 digits from (0, 1) and if assume its a and b then you got:

rand1 = min(a, b)
rand2 = abs(a - b)
rand3 = 1 - max(a, b)

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