From: Ryan Davis <ryand-ruby@...>
Date: 2009-03-20T16:27:52+09:00
Subject: Re: Complex sort of matrix possible, e.g. like Excel?


On Mar 19, 2009, at 20:01 , Rob Biedenharn wrote:

> On Mar 19, 2009, at 10:44 PM, Ryan Davis wrote:
>>
>> I'm kinda surprised nobody has said this:
>>
>>   sorted = matrix.sort_by { |row| [row[0], -row[1]] }
>>
>> P.S. PLEASE trim to the relevant parts when you reply. In some of  
>> your email on this thread you have two whole copies of nearly the  
>> whole thread.
>
> Actually, it was suggested, but it assumes that row[1] has a -@  
> method.  The OP confirmed later that the columns are text, not  
> numbers.

kk. sorry. I made assumptions based on him using Matrix. I couldn't  
see that someone suggested this already through all the noise. :)

umm....

class String
   def -@
     self.gsub(/./) { |s| (?z - s[0] + ?a).chr }
   end
end

 >> %w(abc def ghi jhk).sort_by { |s| -s }
=> ["jhk", "ghi", "def", "abc"]

horrible, no?

:D