From: Austin Ziegler <halostatue@...>
Date: 2004-09-18T00:30:29+09:00
Subject: Re: 2-d arrays

On Fri, 17 Sep 2004 05:09:56 +0900, Barry Sperling
<barry@angleinc.com> wrote:
> 
> Reading the recent posts about ant-wars, I thought that, as a nuby,
> it would be interesting to try to recreate the ant-wars engine. I
> looked at their code a little, and then started in. I appreciate
> that James Edward Gray II provided us with his code, but I'll look
> at it after I've made more progress.
>
> I decided to create 2-d arrays to hold the data for given positions
> (hexagonal blocks). One would hold the amount of food at a position,
> another would hold the traversability of it, etc. My first attempt
> failed in a strange way and the point of this email is: why?

> Method 1
>   cols = 10
>   empty_row_int = Array.new( cols, 0 )
>   $food_layout = Array.new
>   rows.times { $food_layout.push( empty_row_int ) }
>   puts $food_layout[ 0 ][ 0 ]  # 0
>   $food_layout[ 0 ][ 0 ] = 6   # SET FOOD ITEMS IN HEXAGON
>   puts $food_layout[ 0 ][ 0 ]  # 6
>   puts $food_layout[ 1 ][ 0 ]  # 6   WRONG!

Try:

  cols = 10
  rows = 10
  food_layout = Array.new(rows) { Array.new(cols, 0) }

  puts food_layout[0][0]    # -> 0
  food_layout[0][0] = 6     # Set food items in hexagon
  puts food_layout[0][0]    # -> 6
  puts food_layout[1][0]    # -> 0

-austin
-- 
Austin Ziegler * halostatue@gmail.com
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