From: "David A. Black" <dblack@...>
Date: 2005-10-11T20:21:30+09:00
Subject: Re: Sort pseudo-lists

Hi --

On Tue, 11 Oct 2005, William James wrote:

>
> James Edward Gray II wrote:
>
>> irb(main):001:0> arr = eval "{{3.1, 1.3, 2.5, 2.1}, {2.1, 3.1, 2.4,
>> 2.2}, {1.4, 2.2, 2.1, 4.2}}".tr("{}", "[]")
>> => [[3.1, 1.3, 2.5, 2.1], [2.1, 3.1, 2.4, 2.2], [1.4, 2.2, 2.1, 4.2]]
>> irb(main):002:0>
>> irb(main):003:0* arr.sort { |a, b| a.first <=> b.first }
>> => [[1.4, 2.2, 2.1, 4.2], [2.1, 3.1, 2.4, 2.2], [3.1, 1.3, 2.5, 2.1]]
>
> arr.sort_by{|x| x.first }

Better yet:

   arr.sort

which will handle tie-breaks automatically.


David

-- 
David A. Black
dblack@wobblini.net