Generate 3 random number that sum to 1 in R

Question

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

Basically I am trying to partition something into three rand

Answer 1

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)