From: William James <w_a_x_man@...>
Date: 2007-09-08T05:20:11+09:00
Subject: Re: array handling advice

On Sep 7, 12:38 pm, Chris McMahon <christopher.mcma...@gmail.com>
wrote:
> There is probably a simple way to do this, but I'm drawing a blank:
>
> I have an arbitrarily large input array, like
>
> input = ['a','b','c','d','e','f','g']
>
> and three target arrays like
>
> targ_one = []
> targ_two = []
> targ_three = []
>
> I want to deal out the elements of this array into three target arrays
> so they end up like
>
> ['a','d','g']
> ['b','e']
> ['c','f']
>
> It seems there should be an elegant way to do this, but I haven't hit
> on it.  Suggestions would be welcome.

input = ['a','b','c','d','e','f','g']
def seq lo,hi,gap
  (0 .. ((hi-lo)/gap)).map{|n| n*gap + lo}
end

output = (0..2).map{|i|
  input.values_at( *seq(i,input.size-1,3) ) }