dolfin team mailing list archive

[Johan Hake <hake@xxxxxxxxx>]

Hello!

I tried to compile an advection diffusion form using Streamline Upwind Petrow 
Galerkin stabilazing method, similar to the one introduced in DOLFIN 0.6.4. 
Using 3 dimensional and first degree Lagrange elements, FFC/g++ chokes when 
the produced code is compiling. It wont finish compile... Is this a known 
problem and a limitation of FFC/g++?

In PyCC I use DOLFIN to assemble the same system matrix, but instead of using 
one form for the whole system I split the form into at least 4 different 
forms. These compiles smoothly and after I have assembled the matrices I just 
add them together. 

This approach is not possible using the present DOLFIN linear algebra 
interface, as sum of matrices is not supported. Is this something we want for 
the future? 

Johan