dolfin team mailing list archive

["Garth N. Wells" <gnw20@xxxxxxxxx>]

On 25/11/10 22:48, Benjamin Kehlet wrote:
> On 25 November 2010 23:29, Garth N. Wells<gnw20@xxxxxxxxx>  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

> > Garth
> >
> > > --
> > > Anders