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MathGroup Archive 2007

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Re: Mathematica v5 versus v6

  • To: mathgroup at smc.vnet.net
  • Subject: [mg80091] Re: [mg80031] Mathematica v5 versus v6
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Sun, 12 Aug 2007 07:19:05 -0400 (EDT)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <200708110603.CAA02487@smc.vnet.net>
  • Reply-to: murray at math.umass.edu

Can you give us a clue as to what sort of 8-by-8 matrix you're trying to 
work with?  I'm finding that Mathematica 6 obtains MatrixRank for 
RandomReal[{-10,10}] or RandomInteger[{0,100}] entries in essentially no 
time at all, i.e., 0. or on the order of 10^{-17}.

Jon wrote:
> Hi
> 
> I have found that there are some simple problems which can be done quickly in v5 but the new v6 seemingly cannot.
> 
> For example I am presently doing some work which requires the calculation of the Rank of an 8 by 8 matrix. Using my notebook, 1Gb RAM and 1.73GHz with v5.1, I get the answer in a few seconds. When I installed v6 and ran the same nb file I never got an answer even after running for 1 hour.
> 
> Is there a bug in v6?
> 
> If others are also running v6 I would be interested in getting in touch to see if other users have the same experience. If you are running on a 64 bit machine I would really like to see if that solves the problem and can give  an answer with v6.
> 
> Any comments are very welcome!
> 
> Thanks
> 
> Jon
> 

-- 
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305


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