Dear all, I would like to get the animation on the linear wave equation in the tutorial as a visualisation in Paraview. I used the following code to store result files: ... phi -= dt / 2 * p ... t += dt ... if step % 10 == 0: ... File("waveEqn.pvd")<< phi ... output = File("waveEqn.pvd") ... output << phi ... del output I expected a number of files that would form snapshots for the animation, but I got a single file. Could you please show me how to go about it. Regards. David