Maximum Array Size (Again! was: [PD] array arrow test7)

[Roman Haefeli]

hello everyone

iirc, there was a discussion about arrays and a problem to read huge
arrays with [tabread4~]. due to a limitation of 32bit-floats, it's not
possible to read huge arrays continously after a certain point, because
the index cannot represent each integer, when it is higher than a
certain value. i am not sure anymore, but i think, the maximum index is
2 ^ 23 = 8388608, which would make it possible to read out an array
without artefacts of 8388608 / 44100 = 190s length. matju, who left this
list, has explained that much nicer and more accurate. unfortunately i
couldn't find that post anymore. anyway, the moral of this story is,
that bigger arrays than 3min should be avoided, otherwise artefacts are
expected.

roman 


On Wed, 2007-01-31 at 08:48 -0600, Kyle Klipowicz wrote:
> Yes, this is a built-in limitation that can be modified in the source
> code. You could try writing a multi-array patch that uses seamless
> transitions or do as Andy suggested.
> 
> Or you could modify the source, and recompile.
> 
> References:
> http://lists.puredata.info/pipermail/pd-list/2003-04/011065.html (change source)
> http://lists.puredata.info/pipermail/pd-list/2003-04/011065.html
> (other discussion/caveats)
> 
> Actually, I just found this message from Miller (April, 2003):
> 
> 'Alternatively, just specify "-maxsize 1000000000" (or whatever) in the "read"
> message.  Oops, still no usable help window for read/writesf... I've got that
> in the pipe for the next release.'
> 
> (http://lists.puredata.info/pipermail/pd-list/2003-04/011069.html)
> 
> Does anybody know if this was implemented? I have no way to test right
> now, but that would be great.
> 
> ~Kyle
> 
> On 1/31/07, padawan12 <padawan12 at obiwannabe.co.uk> wrote:
> > Hi Echo!
> >
> > Tip: Don't use files longer than 2 mins :)
> >
> > Best way is to use [sfread~] instead.
> >
> > Andy
> >
> > On Wed, 31 Jan 2007 00:37:54 +0100
> > Echo Ho <pidi at echoho.at> wrote:
> >
> > > hallo pidier
> > > i'm using Core 2 Duo mac book , and i don't know if the flowing
> > > problem is a os x  (10.39 pd 0.39.2 extended test 7 or not:
> > >
> > > it doesn't load to array properly, when a sound file is longer than 2
> > > Min.
> > > Message | read  -resize -maxsize le+08   |
> > >
> > > error: soundfiler_read: truncated to 4000000 elements
> > > warning: array array1: clearing save-in-patch flag
> > > error: usage: read [flags] filename tablename...
> > > flags: -skip <n> -nframes <n> -resize -maxsize <n> ...
> > > -raw <headerbytes> <channels> <bytespersamp> <endian (b, l, or n)>.
> > >
> > > it works with a old extended version on G4...
> > > ;-( is there any tip for me?
> > >
> > >   (\   /)
> > >   [- . - ___earweego_sonicvision
> > >   www.earweego.net
> > >
> > >
> > >
> > >
> > >
> >
> > _______________________________________________
> > PD-list at iem.at mailing list
> > UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
> >
> 
> 


		
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