Re: Sum of list?
Re: Sum of list?
- Subject: Re: Sum of list?
- From: Martin Orpen <email@hidden>
- Date: Thu, 01 Jul 2004 09:30:14 +0100
on 30/6/04 11:15 pm, Nigel Garvey at email@hidden
wrote:
>
I'm on my old 4400 at the moment, where the difference is quite marked,
>
even with just 50000 integers. (Longhand version:3.568 seconds, nested
>
loops:5.571 seconds.) The point of the longhand method is to reduce the
>
amount of time the script spends executing loop instructions. On my
>
machines, at least, it takes less time to do one iteration with 19
>
additions than to do ten iterations with 1 addition each. The difference
>
isn't very much on my PowerBook, but it does make the difference between
>
being faster or slower than 'statlist'. ;-)
You're right of course - scripting on 1.25GHz laptops and then later testing
them on G5s has made me rather lazy.
As has access to the shell. At the merest hint of a difficult sum I find
myself automatically typing echo pipe bc.
[snip]
>
It wouldn't even be worth optimising ((n * (n + 1)) / 2) to ((n * n + n)
>
div 2). ;-)
Oh, it would be, and It highlights another of my failings - given a choice
of two variations, I'll take the one that looks good as a piece of
typography in the editor window every time :-)
Regards
--
Martin Orpen
Idea Digital Imaging Ltd -- The Image Specialists
http://www.idea-digital.com
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