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MathGroup Archive 2004

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Re: Mathematica 5: Integration bug in quadratic found by the GEMM machine

  • To: mathgroup at smc.vnet.net
  • Subject: [mg46914] Re: [mg46909] Mathematica 5: Integration bug in quadratic found by the GEMM machine
  • From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
  • Date: Tue, 16 Mar 2004 02:37:17 -0500 (EST)
  • References: <200403150454.XAA16166@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Well, I hope that these are mostly "machine generated bugs". The 
problem with this sort of approach of course is that you can take just 
one genuine bug in, say, integration, and then by varying the input in 
various ways generate 10, 100 or 10000 additional "bugs". Whenever I 
hear of a "massive flow of bugs" I suspect something like this at work.

Andrzej


On 15 Mar 2004, at 05:54, Vladimir Bondarenko wrote:

> Hello,
>
> Here is, just of pure curiosity, a sample from my GEMM machine:
>
>
> $Version
>
> 5.0 for Microsoft Windows (June 11, 2003)
>
> Integrate[1/(-2 z^2 + 3 z - 1), {z, -1, 0}]
>
> Log[3/2]     // invalid answer
>
> 0.405465
>
> NIntegrate[1/(-2*z^2 + 3*z - 1), {z, -1, 0}]
>
> -0.405465
>
>
> But the above is just a good opportunity: actually, ' am writing
> here to announce the next good piece of news: a massive flow of
> never published bug reports on a certain system is coming within
> several next days after which we will operate at a new level
> of speed; he who watches the activity knows well what I mean.
>
>
> Best wishes,
>
> Vladimir Bondarenko
>
> http://www.cybertester.com/
> http://www.CAS-testing.org/
>
>


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