From: Robert Klemme <shortcutter@...>
Date: 2009-09-08T00:08:25+09:00
Subject: Re: Two Dimensional Arrays in Ruby?

2009/9/7 Mason Kelsey <masonkelsey@gmail.com>:
> Your helpfulness is appreciated.  Unfortunately at age 68 my eyesight is not
> what it used to be.  It works fine when I insert to missing comma.  Ah!
> Programming is a young person's game.
>
> anarray = [[1, 2, 3], [4, 5, 6], [7, 8, 0]]
> puts anarray[1][1]
> puts anarray[0]
> puts anarray[2][0]
>
> produces (SciTE)
>
>>ruby test_2_dimensional_array.rb
> 5
> 1
> 2
> 3
> 7
>>Exit code: 0
>
> I'm writing a move method for the 8-puzzle problem for my artificial
> intelligence class and need a two dimensional way of representing the
> positions of the tiles.

You don't have to do this low level.  After all, Ruby is an OO
language.  You can use class Matrix:

$ irb19 -r matrix
Ruby version 1.9.1
irb(main):001:0> m = Matrix[[1, 2, 3], [4, 5, 6], [7, 8, 0]]
=> Matrix[[1, 2, 3], [4, 5, 6], [7, 8, 0]]
irb(main):002:0> m[1,1]
=> 5
irb(main):003:0>

Cheers

robert

-- 
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