From: Jean-Julien Fleck <jeanjulien.fleck@...>
Date: 2010-08-19T15:07:44+09:00
Subject: Re: can i do this in ruby? a simulation process

2010/8/18  <brabuhr@gmail.com>:
> On Wed, Aug 18, 2010 at 5:08 PM, Rob Biedenharn
> <Rob@agileconsultingllc.com> wrote:
>> OK, I know this thread is going for some kind of record, but like any good
>> wreck it's so hard not to look.
>
> What kind of record would that be?

I think Rob is talking about the number of mails in the thread (53 at
the time being), which is quite impressive for such a simple question
:o)

>> Why isn't anyone saying "make an object"?  Well, I will!
>
> Well, JJ Fleck did suggest making a Vehicle class :-)

Indeed. Here is what I did (with no comment and no mean value
computation, to let Bruce think about what happens)

 class Vehicle
   attr_reader :departure_time,:arrival_time,:type,:passengers

   def initialize(present_time)
     @departure_time = present_time
     @arrival_time   = @departure_time + 50 + rand(21)
     @type,@passengers = decide_type
   end

   def decide_type
     r = rand(10)
     return 'car',1 if r < 2
     return 'car',2 if r < 5
     return 'car',3 if r < 6
     return 'car',4 if r < 7
     return 'bus',40
   end
 end

 vehicles = Array.new
 time = 0
 500.times do
   vehicles << Vehicle.new(time)
   time = vehicles[-1].departure_time + 5 + rand(31)
 end

 sum = 0
 vehicles.sort_by {|e| e.arrival_time}.each do |e|
   sum += e.passengers
   puts "#{sum} passengers were there after #{e.arrival_time} seconds"
   break if sum > 500
 end


>> http://gist.github.com/536140
>
> Nice.  I like the Config class.

Yes. Perhaps a bit of overkill for the given problem :o)

Cheers,

-- 
JJ Fleck
PCSI1 Lycée Kléber