From: "Kent S." <happy@...>
Date: 2004-02-10T03:04:57+09:00
Subject: Re: Newbiest ? ever

Because, matrix = Array.new( 3, Array.new( 4, 0 ) )
creates an array with three elements all poining to the same array 
object. What you need is something like that:

matrix = Array.new( 3 ) { Array.new( 4, 0 ) }

/kent

Orion Hunter wrote:
> (ruby 1.8.0 Linux)
> 
> I don't understand why I get the following behavriour:
> 
> irb(main):001:0> matrix = Array.new( 3, Array.new( 4, 0 ) )
> => [[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]]
> irb(main):002:0> matrix[0][0] = 1
> => 1
> irb(main):003:0> matrix
> => [[1, 0, 0, 0], [1, 0, 0, 0], [1, 0, 0, 0]]
> irb(main):004:0>
> 
> I would have expected the assignment of matrix[0][0] to produce a matrix:
> [[1,0,0,0],[0,0,0,0][0,0,0,0]]
> 
> What am I not getting here?
> 
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> 
> 
>