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MathGroup Archive 2007

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Re: Mathematica v5 versus v6

  • To: mathgroup at smc.vnet.net
  • Subject: [mg80080] Re: Mathematica v5 versus v6
  • From: Helen Read <hpr at together.net>
  • Date: Sun, 12 Aug 2007 07:13:23 -0400 (EDT)
  • References: <f9jjnc$2i8$1@smc.vnet.net>

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.

It would help if you would post a specific example. I just now tried 
computing the MatrixRank on some matrices of random integers, and it was 
pretty much instantaneous for an 8 by 8 matrix, and took less than a 
second for a 100 by 100 matrix. This is on a 5-year-old Pentium 4 (2 
GHz, 512 MB RAM).

-- 
Helen Read
University of Vermont


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