Step-3: Statistics and a new sweeper

In this step, we will show how to work with the statistics pySDC generates and how to write solutions to file. We will also introduce a new problem as well as a new sweeper.

• Part A: Getting statistics. What the stats dictionary holds, and how to filter and sort it.

• Part B: Adding statistics. A hook of our own records the energy of particles in a Penning trap, solved with the Boris-SDC sweeper.

• Part C: Studying collocation node types. A parameter study over the collocation nodes, and why symmetric nodes conserve the energy.

• Part D: Writing solutions to file. The LogToFile hook writes the solution of a 2D heat equation to disk, we read it back and restart the run from it.

Each part is a Python script in jupytext “percent” format: run it with python, open it as a notebook in Jupyter, or read it on the website, where it is executed with every build. HookClass_Particles.py holds the hook of Part B, which Part C and Step 4 use as well.