From: Benoit Daloze <eregontp@...>
Date: 2010-06-21T20:13:16+09:00
Subject: Re: [QUIZ] Random Points within a Circle (#234)

Hi !

On 19 June 2010 20:05, Daniel Moore <yahivin@gmail.com> wrote:
> ## Random Points within a Circle (#234)
>
> Greetings Rubyists,
>
> Generating random numbers is a useful feature and Ruby provides us
> with `Kernel.rand` to generate numbers uniformly distributed between
> zero and one. If we want to generate random numbers with other
> distributions, then we'll need to do a little work. The quiz this week
> is to generate random points uniformly distributed within a circle of
> a given radius and position.
>
> This quiz is relatively simple, great if you are new to Ruby or
> strapped for time. Remember, it is contributions from people like
> *you* that make Ruby Quiz succeed!
>
> Have fun!
>
> -Daniel

So here is my solution in a hundred lines, with an ImageMagick visualisation:

http://gist.github.com/446707

I had an intuition doing some Math.sqrt about the distance, and it
revealed to be exact :)

Enjoy,
Benoit Daloze