From: William James <w_a_x_man@...>
Date: 2005-10-11T18:41:52+09:00
Subject: Re: Sort pseudo-lists


pete boardman wrote:
> Is it easy to
> sort the array of arrays by their second, third, and fourth entries
> as well:
>
> ie such that
>
> [[2.1, 2.2, 9.5, 2.1], [2.1, 2.2, 2.4, 2.2], [2.1, 2.2, 2.1, 4.2]]
>
> sorts to
>
> [[2.1, 2.2, 2.1, 4.2],[2.1, 2.2, 2.4, 2.2],[2.1, 2.2, 9.5, 2.1]]
>
> rather than
>
> [[2.1, 2.2, 9.5, 2.1], [2.1, 2.2, 2.4, 2.2], [2.1, 2.2, 2.1, 4.2]]
>
> thanks
>
> Pete

a = "{{2.1, 2.2, 9.5, 2.1}, {2.1, 2.2, 2.4, 2.2}, {2.1, 2.2, 2.1,
4.2}}"\
  [2..-3].split( '}, {' ).map{|x| x.split( /,\s+/ ).map{|s| s.to_f } }
p a.sort