From: Urabe Shyouhei <shyouhei@...>
Date: 2007-06-17T06:23:30+09:00
Subject: Re: comments needed for Random class

Daniel DeLorme wrote:
> a float in the range 1.1 <= n < 3.1, same as 1.1+rand*(3.1-1.1)

The world is not *that* simple.
What if one (or both) side of range is Infinity? it is quite possible
programmer think ruby can generate a half-open random sequence in that
way (which is obviously a delusion).
What if (Float::MIN..Float::MAX) is given?  Random float of that range
(1) have far grater lower bound than Float::MIN if you choose its least
upper bound be Float::MAX, or (2) have far smaller upper bound than
Float::MAX if you choose its infimum be Float::MIN, or (3) have
non-uniform distribution if you choose to force both bounds.