From: Michael Kohl <citizen428@...>
Date: 2009-06-08T00:23:37+09:00
Subject: Re: adding, multiplying array

On Sun, Jun 7, 2009 at 4:15 PM, Haris Bogdanović
<haris.bogdanovic@gmail.com> wrote:
> I want to multply all elements of two arrays and add that to all elements of
> the third array like this:
>
> c+=a*b
>
> c=[1,1,1]
> a=[2,2,2]
> b=[3,3,3]
>
> c=[7,7,7]  # (1+2*3)=7

How about a very simple each_index approach?

>> c.each_index { |i| c[i] += a[i] * b[i] }
=> [7, 7, 7]

Hope that helps,
Michael

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