In section one of mylittlengsolve we want to show how you can modify NGSolve classes to your needs and export them to Python for proper use. This is not intended as an introduction to C++ programming, but to guide you to the C++ parts of NGSolve. Some basic concepts of object orientated programming, generic programming (templates and that stuff) will make life a lot easier here ;) It is as well recommended to have a basic knowledge about C++11 features like smart pointers and lambda functions.
Later parts of this tutorial may depend on earlier parts so it's recommended to read it in order, however with some C++ experience it should be ok to start anywhere.
This project is built using CMake, just create a build directory, execute cmake and make:
mkdir build cd build cmake .. make -j make install
On Windows you need to have Visual Studio/build tools (at least 2017) installed:
mkdir build cd build cmake .. -G "Visual Studio 15 2017 Win64" cmake --build . --config release --target install --config RelWithDebInfo
As default mylittlengsolve is installed where your NGSolve installation is. If you want to change that behaviour, set the CMAKE_INSTALL_PREFIX variable:
cmake .. -DCMAKE_INSTALL_PREFIX=your_install_path
In this chapter we will look into how to implement new CoefficientFunctions and FESpaces in NGSolve and export them to Python. For the spaces we will need to create FiniteElements and DifferentialOperators.