Thanks a lot for the explanation. Would it be possible to add a help patch to pd, something like the one attached? div, mod, and % currently default to otherbinops-help.pd but aren't included in that patch.
-Jonathan
--- On Fri, 2/6/09, Mathieu Bouchard <ma...@artengine.ca> wrote:
> From: Mathieu Bouchard <ma...@artengine.ca>
> Subject: Re: [PD] div vs. / & i
> To: "Jonathan Wilkes" <jancs...@yahoo.com>
> Cc: pd-list@iem.at
> Date: Friday, February 6, 2009, 4:12 PM
> On Fri, 6 Feb 2009, Jonathan Wilkes wrote:
>
> > But I just noticed while scrolling in a number box
> that they aren't the same when the dividend is negative.
> In the source for [div], I see this before doing the
> division: if (n1 < 0) n1 -= (n2-1); I feel like I'm
> missing something obvious. Why does [div] behave this way?
>
> So that (x div y)*y + (x mod y) = x
>
> So div is complementary to mod.
>
> Also, int(x / y)*y + (x % y) = x
>
> So / with i is complementary to %.
>
> And div,mod behave the way that they do so that
> (x+y) mod y = x mod y
> (x+y) div y = (x div y) + 1
>
> Whereas div with i and % do not, when x and x+y have
> different signs.
>
> _ _ __ ___ _____ ________ _____________
> _____________________ ...
> | Mathieu Bouchard - tél:+1.514.383.3801, Montréal,
> Québec
div&mod-help.pd
Description: Binary data
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