Computer Science Canada

Random integers
Author:  Clayton [ Mon Feb 19, 2007 10:59 am ]
Post subject:  Random integers
How would you manage this? I've been playing around in irb, and found rand(max), but I'd like to be able to have a defined range of numbers to randomize... Is there a pre-defined random integers method that does this, or would I have to create my own and seed it with the time or some such this?
Author:  Cervantes [ Mon Feb 19, 2007 2:14 pm ]
Post subject:  RE:Random integers
You mean something like Rand.Int in Turing, where you provide a lower bound and a higher bound? Sure:

code:

def rand_range(low, high)
    rand(high - low) + low
end
Author:  Clayton [ Mon Feb 19, 2007 4:37 pm ]
Post subject:  Re: Random integers
hmm, I was thinking of something exactly like that, but I thought I had seen something wrong with it, and now that I think about it, I can't even remember what that was. Thanks Cervantes Very Happy
Author:  wtd [ Mon Feb 19, 2007 11:25 pm ]
Post subject:  RE:Random integers
code:
irb(main):012:0> class Range
irb(main):013:1>    def random_choice
irb(main):014:2>       rand(last - first) + first
irb(main):015:2>    end
irb(main):016:1> end
=> nil
irb(main):017:0> (1..10).random_choice
=> 8
irb(main):018:0> (1..10).random_choice
=> 8
irb(main):019:0> (1..10).random_choice
=> 9
irb(main):020:0> (1..10).random_choice
=> 1
irb(main):021:0> (1..10).random_choice
=> 5
irb(main):022:0>
Author:  Clayton [ Mon Feb 19, 2007 11:38 pm ]
Post subject:  Re: Random integers
Well, I've learned my bit of Ruby for the day. I had no idea there was a Range class. that's damn handy Very Happy thanks wtd.

:


You can syndicate this boards posts using the file backend.php or view the topic map using sitemap.php.

Terms of Use | Privacy Policy