From: Joel Pearson <lists@...>
Date: 2013-01-31T21:09:26+09:00
Subject: Re: Select "columns" from multidimensional array?

Documenting the end result.
I added a sort to keep the input column order, and reordered the inputs 
to make the array itself optional for ease-of-use within the parent 
class.

def get_cols( headers, multi_array=nil)
  multi_array = @data if multi_array.nil?
  multi_array.transpose.select { |header,_| headers.include?(header) 
}.sort_by { |header,_| headers.index(header) || headers.length 
}.transpose
end

irb(main):017:0> get_cols %w(A3 A1), a
=> [["A3", "A1"], ["B3", "B1"], ["C3", "C1"]]

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