Re: NIntegrate issue with symbolic parameters
- To: mathgroup at smc.vnet.net
- Subject: [mg120577] Re: NIntegrate issue with symbolic parameters
- From: Andrew Moylan <amoylan at wolfram.com>
- Date: Sat, 30 Jul 2011 05:58:35 -0400 (EDT)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
To prevent evaluation until the parameters are numeric, you can add a Condition to the definition for Curv. For example, change Curv[R_] := to Curv[R_] /; VectorQ[R, NumberQ] := Don't forget to Clear[Curv] if you have already given the old definition. Andrew Moylan Wolfram Research ----- Original Message ----- > From: "gopher" <gophergoon at gmail.com> > To: mathgroup at smc.vnet.net > Sent: Friday, July 29, 2011 10:01:55 PM > Subject: NIntegrate issue with symbolic parameters > > The docs say that NIntegrate evaluates the integrand with the > variables being symbolic, and then repeatedly evaluates the result > numerically. This is a problem for me as my integrand calls > Eigenvectors which results in a symbolic calculation of the > eigenvectors. If the variables were passed numerically instead, there > would be no problem. > > In the end, I get errors about oscillation and convergence, 'slwcon' > and 'eincr', which should never occur since the integrand is actually > constant! (theoretically and also confirmed by Plot3D). > > Is there a way out? Since the details are a bit long, I am putting a > link to the file below: > > https://netfiles.uiuc.edu/aroy2/www/nintegrate-issue.nb > > Thanks for any help, > Abhishek > >