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

*To*: mathgroup at smc.vnet.net*Subject*: [mg46982] Re: Mathematica 5: Integration bug in quadratic found by the GEMM machine*From*: ankowar at yahoo.com (Andy Kowar)*Date*: Thu, 18 Mar 2004 01:25:19 -0500 (EST)*References*: <200403150454.XAA16166@smc.vnet.net> <c36avb$s0i$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Andrzej Kozlowski <akoz at mimuw.edu.pl> wrote in message news:<c36avb$s0i$1 at smc.vnet.net>... > 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. On the bright side a developer spends time to fix one genuine bug but can claim eliminating 10000.:-) AK > > 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/ > > > >

**References**:**Mathematica 5: Integration bug in quadratic found by the GEMM machine***From:*Vladimir Bondarenko <vvb@mail.strace.net>