Hi Michal,
any chance that you post or send me a small runnable test program.
By the way, there is an open PR (https://github.com/dealii/dealii/pull/9343)
for the computation of the diagonal in a matrix-free manner. Once this is
merged, I will work the matrix-free assembly of sparse matrices.
If you want to use binary packages I highly recommend to use the PPA
here in order to get the newest version:
https://launchpad.net/~ginggs/+archive/ubuntu/deal.ii-backports
After that make sure that you actually install the developer
version. All in one:
sudo add-apt-repository ppa:ginggs/d
I downloaded the source code for deal.II in Ubuntu, which contains the
example files. (I'm a beginner.) I noted, however, that a binary is
available for Ubuntu (18.04) and installed that, instead of compiling the
library. Then I attempted to run step-1.cc from the source code package,
after det
Hello everyone!
This is deal.II newsletter #113.
It automatically reports recently merged features and discussions about the
deal.II finite element library.
## Below you find a list of recently proposed or merged features:
#9642: Add missing include file for step-69 (proposed by kronbichler; m
Dear all,
I've got matrix-free multigrid solver for Stokes problem. The main
bottleneck is solution of coarse problem, so I tried to assemble the
regular sparse matrix and use direct solver. Since the coarse problem is
(relatively) small, I used vmults by unit vector to obtain columns of the
m
Deal all,
I want to weakly impose boundary conditions on, let's say, Laplace problem
(in fact I'm working on Stokes). I'm considering [FE_Q<2>(2)^2] ( that
is FESystem<2>[FE_Q<2>(2)^2] + FE_Q<2>(1) for Stokes).
As a MatrixFree loop I'm using:
this->data->loop(&SymGradMass::local_apply, &Sy
