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