CODEWITHSUNDEEP
rubyrandom
M. Cypher
M. Cypher

Reputation: 7066

Random float in open interval

So I want to generate a random float in Ruby which lies in the interval (0.0, 1.0). Obviously, if we were talking about a closed interval, this would be totally straightforward:

Random.rand

...but we are talking about the open interval, i.e. the number must never be exactly 0.0 or 1.0 because this would crash the program. Just to give a little background, the random float serves as an input to a statistical function which throws an error if the input is not in (0.0, 1.0).

I can think of obvious solutions, such as "rolling again" if the result is 0.0 or 1.0, but I would like to know if there is a more elegant way to do this.

Upvotes: 1

Views: 83

Answers (2)

AGS
AGS

Reputation: 14498

What about 

rand(Float::MIN..1-Float::MIN)

Upvotes: 0

sawa
sawa

Reputation: 168091

Probably this is the best that can be done

Random.rand(Float::MIN...1.0)

Upvotes: 3

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