From: Josh Cheek <josh.cheek@...>
Date: 2009-09-27T17:12:25+09:00
Subject: Re: 2D array to array of hashes with repeating header

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On Sun, Sep 27, 2009 at 1:10 AM, Jason Lillywhite <
jason.lillywhite@gmail.com> wrote:

> I have this array:
> data = [[:time, :pressure],[0,2.3],[1,4.1],[2,7.56],...]
>
> All the arrays in data could have an arbitrary number of items in it and
> the total number of arrays in data is arbitrary but all arrays will be
> the same size and the first array will always be the "header" array.
>
> I need to convert data to an array that looks like this:
>
> new_data =
>
> [{:time=>0,:pressure=>2.3},{:time=>1,:pressure=>4.1},{:time=>2,:pressure=>7.56}]
>
> Is there a straight forward way to set this up? I'm happy with hints.
> Thank you!
> --
> Posted via http://www.ruby-forum.com/.
>
>
This is destructive. If you want to keep the original data too, you can
implement the same process slightly differently, but this was just cleaner.

to_convert = [[:time, :pressure],[0,2.3],[1,4.1],[2,7.56]]

header = to_convert.shift

to_convert.map! do |ary|
  hsh = Hash.new
  ary.each_with_index{|val,index| hsh[header[index]] = val }
  hsh
end

to_convert # => [{:pressure=>2.3, :time=>0}, {:pressure=>4.1, :time=>1},
{:pressure=>7.56, :time=>2}]

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