Re: Elliptic Integral problem with 5.0
- To: mathgroup at smc.vnet.net
- Subject: [mg46720] Re: Elliptic Integral problem with 5.0
- From: "T.Telliskivi" <maria.08.6689847 at telia.com>
- Date: Tue, 2 Mar 2004 19:10:22 -0500 (EST)
- References: <c1onol$3cc$1@smc.vnet.net>
- Reply-to: "T.Telliskivi" <maria.08.6689847 at telia.com>
- Sender: owner-wri-mathgroup at wolfram.com
V4.1 gives a fast result: ((8*r*x*EllipticK[-((4*r*x)/(r^2 - 2*r*x + x^2 + z^2))])/ Sqrt[r^2 - 2*r*x + x^2 + z^2] - (1/(2*r*x))*((-r^2 - x^2 - z^2)* (4*Sqrt[r^2 - 2*r*x + x^2 + z^2]* EllipticE[-((4*r*x)/(r^2 - 2*r*x + x^2 + z^2))] - (4*(r^2 + x^2 + z^2)*EllipticK[ -((4*r*x)/(r^2 - 2*r*x + x^2 + z^2))])/ Sqrt[r^2 - 2*r*x + x^2 + z^2])))/ (r^4 - 2*r^2*x^2 + x^4 + 2*r^2*z^2 + 2*x^2*z^2 + z^4) /Tanel Telliskivi "Andreas Stahel" <sha at hta-bi.bfh.ch> skrev i meddelandet news:c1onol$3cc$1 at smc.vnet.net... > Dear Mathematica users > > we just upgraded from version 4.2 to 5.0 (5.0.1) > and it seems that an some integrals are not solvabla any more > Here the input on the system > $Version > "5.0 for Sun Solaris (UltraSPARC) (November 26, 2003)" > > Integrate[Cos[phi]/(x^2 - 2*x*r*Cos[phi] + r^2 + z^2)^(3/2),{phi, 0, 2*Pi}] > > > and the kernel just happily uses up CPU cycles with no result. I have > not found any hint on similar problems on the wri site and google > did not turn up information either. > > Would anybody have a hint on what is going on. > > > With best regards > > Andreas > =========================================================================== > Andreas Stahel E-Mail: Andreas.Stahel at [ANTI-SPAM]hti.bfh.ch > Mathematics, HTI Phone: ++41 +32 32 16 258 > Quellgasse 21 Fax: ++41 +32 321 500 > CH-2501 Biel WWW: www.hta-bi.bfh.ch/~sha > Switzerland >