From: RichardOnRails <RichardDummyMailbox58407@...>
Date: 2009-03-18T23:22:25+09:00
Subject: Re: Complex sort of matrix possible, e.g. like Excel?

On Mar 18, 6:16 am, Robert Klemme <shortcut...@googlemail.com> wrote:
> 2009/3/18 Christopher Dicely <cmdic...@gmail.com>:
>
> > Enumerable#sort lets you do this fairly easily with just a pure array
> > of arrays, e.g., to sort the array-of-arrays "arr" by the first column
> > ascending and the second descending:
>
> > arr.sort {|a,b| [a[0]<=>b[0], b[1]<=>a[1]].find {|x| x!=0} || 0}
>
> Alternatively with less intermediate Arrays and less comparison operations.
>
> arr.sort do |a,b|
>  c = a[0]<=>b[0]
>  c == 0 ? b[1]<=>a[1] : c
> end
>
> You can as well do
>
> arr.sort_by {|a,b| [a[0]<=>b[0], b[1]<=>a[1]]}
>
> Cheers
>
> robert
>
> --
> remember.guy do |as, often| as.you_can - without end

Hi Robert,

As usual, you've got the perfect answer.  Thank you very much.

Best wishes,
Richard