Re: Quite Upset with NIntegrate
- To: mathgroup at smc.vnet.net
- Subject: [mg54180] Re: [mg54142] Quite Upset with NIntegrate
- From: yehuda ben-shimol <bsyehuda at gmail.com>
- Date: Sat, 12 Feb 2005 01:58:37 -0500 (EST)
- References: <200502110834.DAA09269@smc.vnet.net>
- Reply-to: yehuda ben-shimol <bsyehuda at gmail.com>
- Sender: owner-wri-mathgroup at wolfram.com
It is difficult to comment without seeing the details. Is there any way we can see it? yehuda On Fri, 11 Feb 2005 03:34:40 -0500 (EST), I. Turan <ituran at bohr.concordia.ca> wrote: > Hi: > > I have been trying to evaluate a 4-dimensional integral by using > NIntegrate with Mathematica 4 w2k. The integrand and even the > integration limits are quite complicated (depending on int. > variables). The length of the integrand is around 2000 lines in the > FortranForm. > > If I don't play with any options of NIntegrate, It takes one day to > get one data point and gives very unreasonably weird values. By > setting, however, MaxPoints something like 100000 it is possible to > get faster results but still it seems that Mathematica couldn't handle > it. When I draw a figure from these data points, it appears very very > spiky such that it is even not possible to fit the curve. However, it > is supposed to be very smooth. > > Should I accept that Mathematica can not handle such a > numerical integration or is there a way to make Nintegrate working > better? > > Thanks a lot, > > Ismail > >
- References:
- Quite Upset with NIntegrate
- From: ituran@bohr.concordia.ca (I. Turan)
- Quite Upset with NIntegrate