Re: Nintegration - numerical integration converges too slow
- To: mathgroup at smc.vnet.net
- Subject: [mg38152] Re: Nintegration - numerical integration converges too slow
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Wed, 4 Dec 2002 03:23:08 -0500 (EST)
- Organization: Universitaet Leipzig
- References: <asi0ja$epn$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
- Sender: owner-wri-mathgroup at wolfram.com
Hi, nobody can this, if you don't include the integrand. Regards Jens "Fitchard, Ann (PSAF)" wrote: > > I am a new Mathematica user with a numerical integration problem. My 2D > Nintegration gives the warning "slwcon" (numerical integration converges > too slow). I am integrating over a thin strip through a 2D > Interpolating Function. The Interpolating function is zero for most > values. All stips pass through some non-zero region. When the strip is > mostly in the non-zero region there is no problem. Howvever, when the > strip passes through only a small part of the non-zero region, the > warning occurs and the integration is slow. The integration parameters > I have so far found to work best are: WorkingPrecision -> 9, > AccuracyGoal ->Infinity, Precision Goal -> 2, Method -> Gausskronron. > If I increase the PrecisionGoal both the number of warnings and the time > increase. > > Can you suggest a better set of parameters. Thank you in advance. > > Ann Fitchard