[PD] scroll bug

Hans-Christoph Steiner hans at eds.org
Mon Oct 22 18:16:33 CEST 2007

Please post a bug in the tracker.  Attach a patch that this happens  
with, and the instructions to reproduce the bug.  The easier it is to  
reproduce this bug in your patch, the easier it will be to fix the bug:



On Oct 22, 2007, at 12:06 PM, matteo sisti sette wrote:

> Hi,
> I just posted a bug report about this, but I am in an urgency of
> finding a quick workaround.
> On Windows XP,
> sometimes, when scrolling up and down a big patch window with a huge
> lot of gui stuff (many instances of a few gop-enabled abstractions),
> I get a "Divide by Zero" error dialog, which does NOT crash or hang PD
> (but does annoy):
> """
> divide by zero
> divide by zero
>     while executing
> "expr -abs(0)/0"
>     invoked from within
> "pdtk_canvas_scroll .x9a4e60.c y [expr -abs(0)/0]"
>     (command bound to event)
> """
> It never happened to me before, so I suspect it happens when the patch
> you're scrolling is very "big" (in terms of quantity of gui elements).
> Seems to happen only with the scroolwheel, not the scroll bar.
> If I scroll a lot up and down and up and down, I am almost sure to
> reproduce it within less than a minute.
> I have been working for months developing this patch, which is going
> to be used on stage in a show the day after tomorrow and suddenly I
> add a couple of instances and this bug appears; though it does not
> crash pd it does worry me, so my question is: does anybody know this
> bug and know whether there are some particular circumstances
> triggering it so that maybe I can avoid them for the moment??
> (avoiding scrollwheel scrolling is just not feasible, as you can even
> move the mousewheel unintentionally, furthermore the sound technician
> managing the audio through the patch needs to be able to scroll in a
> handy way and has always done it with the scrollwheel since it was
> never a problem up to now)
> PD Vanilla 0.40.2 on Windows XP.
> Clean install with no externals.
> Any help will be appreciated
> Thanks
> m.
> -- 
> Matteo Sisti Sette
> matteosistisette at gmail.com
> http://www.matteosistisette.com
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