Garth N. Wells skrev den 08/07-2008 følgende: > > > Ola Skavhaug wrote: >> Anders Logg skrev den 08/07-2008 følgende: >>> On Tue, Jul 08, 2008 at 09:35:15AM +0200, Ola Skavhaug wrote: >>>> Could we add a default constructor to Parameter, e.g., letting it default >>>> to >>>> int or similar? This will make it possible to wrap it with SWIG. The >>>> current >>>> state of SWIG will declare variables like this (depending on where >>>> Parameter lives in the argument list): >>>> >>>> Parameter arg3; >>>> >>>> This fails due to the lack of default constructor for Parameter. I don't >>>> know >>>> how to get around this silly SWIG behaviour. >>>> >>>> Ola >>> We could add a default constructor for an int parameter named >>> "undefined" with value 0 or similar. Parameter is never used directly >>> by a user anyway (since it will be cast automatically to the >>> underlying type). >> >> I don't see how naming the parameter "undefined" would help, since 0 should >> be >> a valid interger option. Except from that, I follow. >> >> I have made some improvements to the SLEPc eigenvalue solver, making it >> possible to set tolerance and max iter from dolfin. Another thing we should >> consider is making it possible to specify the problem type, EPS_HEP, >> EPS_NHEP, >> EPS_GHEP, or EPS_GNHEP (or so). >> > > The SLEPc interface is very primitive, so improvements are welcome. > > Ola, I guess this means that you're using it?
Yes, I'm trying to solve very big matrix eigenvalue problems. My problems are non-symmetric and very sparse, and I'm only interested in the largest real eignvalue to find out if the system u' = Au is stable or not. It seems like this is a quite difficult problem, at least the current way dolfin communicates and integrates with SLEPc. Ola > Garth > >> Ola >> >>> -- Anders >> >> >> _______________________________________________ >> DOLFIN-dev mailing list >> [email protected] >> http://www.fenics.org/mailman/listinfo/dolfin-dev > > _______________________________________________ DOLFIN-dev mailing list [email protected] http://www.fenics.org/mailman/listinfo/dolfin-dev
