From: "Brian Schröder" <ruby.brian@...>
Date: 2005-08-11T00:28:39+09:00
Subject: Re: Matrix type ?

On 10/08/05, zimba-tm <zimba.tm@gmail.com> wrote:
> Hello ruby fellows,
> 
> Maybe you can help me.
> 
> I'm currently trying to make a Sudoku solver for my first ruby program.
> Sudoku is a nice 9x9 board game with simple rules, but it can be tough
> to solve. More infos at http://www.sudoku.com/ if you want to launch a
> RubyQuizz :-P
> 
> What I would do, is use a kind of 2D Matrix that would represent the
> board but couldn't find a satisfying method.
> 
> This is my current implementation using arrays :
> ----
> board = Array.new
> 
> (1..9).each do |row_num|
>   board[row_num] = Array.new
>   (1..9).each do |col_num|
>     board[row_num][col_num] = "X"
>   end
> end
> ----
> If I "puts board", I'd like to have a 2D view instead.
> How does puts work, does it call the to_str method ?
> 
> Also, I'd like to access the console as a 2D Array too,
> so that I can write on screen directly like a text-framebuffer.
> 
> I have so many questions.. :-)
> /me is refraining to flood ruby-talk
> 
> --
> Cheers,
>   zimba
> 
> http://zimba.oree.ch
> 
> 

You should start with a board class. Something like this

class Board
  def initialize
    @fields = Array.new(9) { Array.new(9) { :empty } }
  end

  def [](x,y)
    @fields[y][x]
  end

  def []=(x,y,v)
    @fields[y][x] = v
  end

  def to_s
    @fields.map{|row| row.map{|cell| cell.ljust(10) }.join(' ')}.join("\n")
  end
end

and go on from here.

regards,

Brian

-- 
http://ruby.brian-schroeder.de/

Stringed instrument chords: http://chordlist.brian-schroeder.de/