From: "ara.t.howard" <ara.t.howard@...>
Date: 2008-09-11T00:55:14+09:00
Subject: Re: How to operate on 2 arrays simultaneously?


On Sep 10, 2008, at 9:42 AM, Patrick Doyle wrote:

> There has got to be a more elegant solution than this.  Suppose I have
> 2 identical length arrays that I want to add together to produce a
> third array.  The best solution I've come up with is:
>
> c = (0...a.size).map {|i| a[i] + b[i]}
>
> Any suggestions?


cfp:~ > cat a.rb
a = 0,1,2
b = 3,4,5

c = a.zip(b).map{|pair| pair.first + pair.last}
p c


c = Array.new(a.size){|i| a[i] + b[i]}
p c



cfp:~ > ruby a.rb
[3, 5, 7]
[3, 5, 7]


the second is far more efficient for large arrays - in terms of memory.

a @ http://codeforpeople.com/
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