From: Tim Pease <tim.pease@...>
Date: 2007-02-14T04:27:19+09:00
Subject: Re: Extracting sub elements in array

On 2/13/07, WKC CCC <wai-kee.chung@uk.bnpparibas.com> wrote:
> Thanks,
>
> I've created the following function as an extention to class Array:
>
>   def Section(startRow,nRows,startCol,nCols)
>     part = self[startRow..startRow+nRows-1]
>     part = part.map{|x| x[startCol..startCol + nCols-1]}
>     return part
>   end
>
> testArray=[[1,2,3,4,5],
>            [6,7,8,9,10],
>            [11,12,13,14],
>            [15,16,17,18]]
>
> calling testArray.Section(2,2,2,2)
>
> will return [[13,14],[17,18]]
>

def section( rows, cols )
  self.slice(rows).map! {|c| c.slice(cols)}
end

testArray = [
  [1,2,3,4,5],
  [6,7,8,9,10],
  [11,12,13,14,15],
  [16,17,18,19,20]
]

testArray.section( 2...4, 2...4 )

[[13, 14],
 [18, 19]]


Blessings,
TwP