Re: Tr vs Total [packed array bug on some versions]
- To: mathgroup at smc.vnet.net
- Subject: [mg49391] Re: Tr vs Total [packed array bug on some versions]
- From: Daniel Reeves <dreeves at umich.edu>
- Date: Sat, 17 Jul 2004 06:39:03 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
I should've mentioned my $Version (problem occurs on Version 5.0 - 2003
Jun 9, on both Linux and Windows).
But as Andrzej figured out, it's actually a bug in packed arrays that was
perhaps fixed between the 2003-Jun-9 release of 5.0 and 2003-Nov-18.
Thanks you all!
Daniel
--- \/ FROM Andrzej Kozlowski AT 04.07.15 21:40 (Yesterday) \/ ---
> On 15 Jul 2004, at 20:00, Daniel Reeves wrote:
>
> > *This message was transferred with a trial version of CommuniGate(tm)
> > Pro*
> > Tr seems to have a problem with big lists. Anyone know why the
> > following
> > 2 expressions don't yield the same result?
> >
> > Tr[Table[8000000, {269}]]
> >
> > Total[Table[8000000, {269}]]
> >
> > (they do if you make either of those constants smaller)
> >
> >
> > --
> > http://ai.eecs.umich.edu/people/dreeves - - google://"Daniel Reeves"
> >
> >
>
> I would say its a bug involving Tr and packed arrays:
>
> Tr[Developer`FromPackedArray[Table[8000000, {269}]]]
>
>
> 2152000000
>
>
>
> Andrzej Kozlowski
> Chiba, Japan
> http://www.mimuw.edu.pl/~akoz/
>
--
http://ai.eecs.umich.edu/people/dreeves - - google://"Daniel Reeves"