From: Robert Klemme <shortcutter@...>
Date: 2009-03-18T19:16:34+09:00
Subject: Re: Complex sort of matrix possible, e.g. like Excel?

2009/3/18 Christopher Dicely <cmdicely@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



-- 
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