From: Steffen P. <ste...@tu...> - 2006-03-02 10:26:06
|
Hello David, example 17 is already available. If you download the latest cvs version with cvs -d:pserver:ano...@cv...:/cvsroot/libmesh co libmesh you will find ex17 in the example directory. If you want to update your current version, you will have to update libmesh with the "-d" option cvs -d:pserver:ano... update -d libmesh in order to receive the files that have been added recently. The online documentation does not include ex17 since it is not included in the actual libmesh release (although I think most people use the cvs version). As far as I know, the online documentation corresponds to the latest libmesh release (someone may correct me if I am wrong). Anyway, I will commit the corresponding files for the web page soon. Steffen David Xu schrieb: > Hi Steffen, > > I'm looking forward to your example 17 and implementation of > generalized eigen value solver with libmesh. > > Thanks, > > David > > On 2/27/06, Steffen Petersen <ste...@tu...> wrote: > >>I have just committed an example 17 including a generalized >>eigenvalue problem. Currently, the largest eigenvalues >>in the spectrum are computed. The code can be easily changed >>in order to compute the smallest values (or use the slepc comman >>line options). However, the Lanczos solver slepc offers with this >>option appears to be somewhat unstable when used to compute >>the smallest values (perhaps this is due to the zero eigenmode in >>this example). An option to work around this problem is to >>configure and install slepc with arpack and parpack (the arpack >>solver works fine for example 17). >> >>Steffen >> >> >> >>David Xu schrieb: >> >>>Hi Steffen and Ondrej, >>> >>>I read your previous message that you've extended the slepc interface >>>to support generalized eigen problems. I'd like to get the details >>>from you. I'm new to libmesh and I'm wondering if you can post some >>>new tutorial examples on how to solve eigen problems using libmesh >>>(eg. solve 1D or 2D simple harmonic oscillator)? That will a great >>>help. >>> >>>Ondrej, I read about your message about your implementation of libmesh >>>and pysparse's jacobi-davidson solver. That sounds really good. Could >>>you please give me the details too? I really appreciate it. >>> >>>David >> >> |