From: 7stud -- <bbxx789_05ss@...>
Date: 2009-05-01T06:31:16+09:00
Subject: Re: Advanced array merging

Jack Bauer wrote:
> Thanks, 7stud. I forgot to mention in my description that after it did 
> the sum of the first item in each of the 3 subarrays
>

Whoops.  That's not what my code does--it sums the totals within one 
array.  I did a vertical traversal rather than a horizontal traversal.

> move on and do 
> all the second items, then the third, etc. Using yours as a base I ended 
> up with:
> 
> index = 0
> array[0].length.times do
>   counter_total = 0
>   array.each do |sub_array|
>     counter_total += sub_array[index].counter
>   end
>   array[0][index].counter = counter_total
>   data_stream_out << array[0][index]
>   index += 1
> end
> 
> Works like a charm and enormously faster than what I was doing before I 
> posted this thread. Before I asked for help here I was using inject and 
> the calculation was taking 28 seconds to complete. This one took 4 and 
> there were about 2,000 more records this time too.

I read your original post again and with all the talk of merging and 
summing, I decided I have no idea what you are trying to do.  If you've 
got what you want--great!
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