On 15 December 2010 01:07, Anders Logg <[email protected]> wrote: > On Tue, Dec 14, 2010 at 10:13:32PM +0000, Garth N. Wells wrote: >> >> >> On 14/12/10 16:13, Benjamin Kehlet wrote: >> >On 26 November 2010 00:04, Anders Logg<[email protected]> wrote: >> >>On Thu, Nov 25, 2010 at 11:02:54PM +0000, Garth N. Wells wrote: >> >>> >> >>> >> >>>On 25/11/10 22:48, Benjamin Kehlet wrote: >> >>>>On 25 November 2010 23:29, Garth N. Wells<[email protected]> wrote: >> >>>>> >> >>>>> >> >>>>>On 25/11/10 20:17, Anders Logg wrote: >> >>>>>> >> >>>>>>On Thu, Nov 25, 2010 at 05:55:36PM +0000, Garth N. Wells wrote: >> >>>>>>> >> >>>>>>> >> >>>>>>>On 25/11/10 17:34, Anders Logg wrote: >> >>>>>>>> >> >>>>>>>>On Thu, Nov 25, 2010 at 05:07:40PM +0000, Garth N. Wells wrote: >> >>>>>>>>> >> >>>>>>>>>There is a dependency on >> >>>>>>>>> >> >>>>>>>>> dolfin/ode/SORSolver.h >> >>>>>>>>> >> >>>>>>>>>in dolfin/common/real.cpp. This seems odd to me. Is there a reason >> >>>>>>>>>for >> >>>>>>>>>it? >> >>>>>>>>> >> >>>>>>>>>Garth >> >>>>>>>> >> >>>>>>>>real.h/cpp provide some basic algorithms that work on high precision >> >>>>>>>>floats. One of these is the matrix exponential which is computed by a >> >>>>>>>>rational approximation, hence the need for solving a linear system. >> >>>>>>>> >> >>>>>>>>The SORSolver is the only solver in DOLFIN that handles high >> >>>>>>>>precision >> >>>>>>>>floats (uBLAS etc can't be used). >> >>>>>>> >> >>>>>>>What is the typical system size? >> >>>>>>> >> >>>>>>>Garth >> >>>>>> >> >>>>>>We have used it for (dense) matrices of size up to 100 x 100 for >> >>>>>>computing quadrature weights etc for the cG(100) method. >> >>>>>> >> >>>>> >> >>>>>You could try Armadillo? I guess it can be templated over the higher >> >>>>>precision floats. >> >>>> >> >>>>Yes. With uBLAS the problem was that, even if it is templated, it >> >>>>relied on non-templated code (eg. stuff in cmath). >> >>>>Also Peter Gottschling claims that MTL4 can do this. Maybe it is worth a >> >>>>try? >> >>>> >> >>> >> >>>I would try Armadillo since it's already a required dependency, and >> >>>it's targeted more at dense problems than MTL4 is. >> >>> >> >>>Garth >> >> >> >>Agree. >> >> >> > >> >It turns out Armadillo can not handle gmp types. >> >The Armadillo documentation says: "... type can be one of: char, int, >> >float, double, std::complex<double>, etc.". However, the promising >> >"etc." does not contain the gmp types. >> >> Have you tried it with gmp types? > > I think that's what he's saying. He tried whether "etc" worked with > GMP types and it didn't work. Benjamin?
Exactly. > > -- > Anders > > > >> Garth >> >> >So, any other suggestions? Or should we leave as it is (ie. use real*) >> >and just clean up the code and add comments? >> > >> >Benjamin > _______________________________________________ Mailing list: https://launchpad.net/~dolfin Post to : [email protected] Unsubscribe : https://launchpad.net/~dolfin More help : https://help.launchpad.net/ListHelp
