Re: NIntegrate or For or Special Function?
- To: mathgroup at smc.vnet.net
- Subject: [mg47706] Re: NIntegrate or For or Special Function?
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Fri, 23 Apr 2004 02:30:35 -0400 (EDT)
- Organization: Universitaet Leipzig
- References: <firstname.lastname@example.org>
- Reply-to: kuska at informatik.uni-leipzig.de
- Sender: owner-wri-mathgroup at wolfram.com
Hi, the most time in computational quantum mechanics has spend to compute the matrix elements. You can try to use existing symmetry relations (Hermitian) and/or recursion relations for the integrals derived from the Bessel, Hankel and Kelvin function recursions. Regards Jens Matt Swingle wrote: > > I am constructing filling entries in a matrix using For loops. The > individual entries come from integrating Bessel, Hankel and Kelvin > functions numerically with NIntegrate. A 100x100 matrix takes a few hours > to run? Is my procedural way of doing things to blame? Is it the > specialty functions (Bessel etc)? Is it simply NIntegrate? Would anyone > be willing to look at my awful code? > > Any help would be greatly appreciated. > > Matt Swingle > mss4 at duke.edu