= FEniCS Project
{c}
{wiki}
https://fenicsproject.org/
One big advantage over <FreeFem> is that it uses plain old <Python> to describe the problems instead of a <domain-specific language>. <Matplotlib> is used for plotting by default, so we get full Python power out of the box!
Also uses <variational formulation of a partial differential equation> like <FreeFem> which is a pain.
One downside is that its documentation is a Springer published PDF https://link.springer.com/content/pdf/10.1007%2F978-3-319-52462-7.pdf which is several years out-of-date (tested with FEnics 2016.2. Newbs. This causes problems e.g.: https://stackoverflow.com/questions/53730427/fenics-did-not-show-figure-nameerror-name-interactive-is-not-defined/57390687\#57390687
<system of partial differential equations> are mentioned at: https://link.springer.com/content/pdf/10.1007%2F978-3-319-52462-7.pdf 3.5 "A system of advection–diffusion–reaction equations". You don't need to manually iterate between the equations.
On Ubuntu 20.04 as per https://fenicsproject.org/download/
``
sudo apt-get install software-properties-common
sudo add-apt-repository ppa:fenics-packages/fenics
sudo apt-get update
sudo apt-get install --no-install-recommends fenics
sudo apt install fenics
python3 -m pip install -u matplotlib
``
Before 2020-06, it was failing with:
``
E: The repository 'http://ppa.launchpad.net/fenics-packages/fenics/ubuntu focal Release' does not have a Release file.
``
but they seem to have created the Ubuntu 20.04 package as of 2020-06, so it now worked! https://askubuntu.com/questions/866901/what-can-i-do-if-a-repository-ppa-does-not-have-a-release-file
TODO heat equation <hello world>.