From: James Edward Gray II <james@...>
Date: 2007-03-12T05:43:18+09:00
Subject: Re: [QUIZ] SimFrost (#117)

On Mar 11, 2007, at 3:07 PM, Christoffer Lern� wrote:

> It's interesting that it looks like everyone populated their grid  
> using a randomizer for each position in the grid.
>
> This is is obviously fast, but for small grids (and low  
> percentages), the percentage of actual generated vapour particles  
> may be off by quite a bit.

What's a "small grid" and what's "quite a bit"?  ;)

#!/usr/bin/env ruby -w

TRIALS = 10_000
SIZE   = 80*22

sum = 0

high = low = nil

TRIALS.times do
   grid    = Array.new(SIZE) { rand < 0.3 ? "." : " " }
   percent = (grid.grep(/\./).size / SIZE.to_f * 100).round

   puts "Actual percentage:  #{percent}" if $DEBUG

   sum   += percent
   low   =  percent if low.nil?  or percent < low
   high  =  percent if high.nil? or percent > high
end

puts <<END_OVERALL
Average: #{sum / TRIALS}
High: #{high}
Low: #{low}
END_OVERALL
# >> Average: 29
# >> High: 35
# >> Low: 26

James Edward Gray II