Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2011

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Mathematica 8 Integration Bug

  • To: mathgroup at smc.vnet.net
  • Subject: [mg116012] Re: Mathematica 8 Integration Bug
  • From: Daniel Lichtblau <danl at wolfram.com>
  • Date: Sat, 29 Jan 2011 05:26:05 -0500 (EST)

ChiaraB wrote:
> Hello,
> 
> I needed to manipulate some probability distributions, so I ran the
> following code:
> 
> ccdfPL[x_, alpha_, xmin_] = (xmin/(xmin + x))^(alpha)
> 
> Assuming[alpha \[Element] Reals && alpha > 0 &&
>   xmin \[Element] Reals && xmin > 0, \!\(
> \*SubsuperscriptBox[\(\[Integral]\), \(0\), \(+\[Infinity]\)]\(D[
>     1 - ccdfPL[x, alpha, xmin], x] \[DifferentialD]x\)\)]
> 
> According to Mathematica 8, this integral does not converge on [0,+\
> [Infinity]), while it does converge using Mathematica 6 and
> Mathematica 7 (it converges using paper and pencil as well :) ). Any
> idea on how this is possible?
> 
> Thanks,
> 
> Chiara

Naughty integration code? (Wouldn't be the first time we needed to put 
it in the time out room.)

I filed a bug report for this. Will investigate further.

Daniel Lichtblau
Wolfram Research




  • Prev by Date: Re: Initial condition with DSolve in Mathematica 8 doesn't work
  • Next by Date: Re: MatrixPlot
  • Previous by thread: Mathematica 8 Integration Bug
  • Next by thread: MatrixPlot