Re: Maybe it's me but the integrator at wolfram doesn't work very well
- To: mathgroup at smc.vnet.net
- Subject: [mg45003] Re: Maybe it's me but the integrator at wolfram doesn't work very well
- From: drbob at bigfoot.com (Bobby R. Treat)
- Date: Fri, 12 Dec 2003 04:42:22 -0500 (EST)
- References: <br9i4v$d22$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Having never heard of the "integrator tool" (a link might be helpful), I can only give the right answers: Integrate[Log[x]/x, x] Log[x]^2/2 Integrate[Log[x], x] -x + x*Log[x] Bobby geoman <geogeo9090 at yahoo.com> wrote in message news:<br9i4v$d22$1 at smc.vnet.net>... > Firstly the "integrator" tool at wolfram evaluates the indefinite integral. Fine > > > Here are some examples of incorrect answers of the "integrator" > > INT means the integral sign > > INT 1 / x ln x > > Don't feel bad though I found another site at mss.vanderbilt.edu that got it wrong as well > > Now this is quite a fundamental integral but is it hopelessly botched by the "integrator." > > > Here is another > > INT ln x > > the "integrator" got that wrong as well. I did find a site that got it right though. > > Where the error lies I don't know but do in fact think it may be somewhere in the original mathematica code. > > BTW can anyone on this list give me the correct answers to the above > thanks geo.