Hi, I have a method-of-lines solution to a 2nd-order PDE, where the solution “sol” is discrete in x, has columns for discrete data points df/dt and f, and has an ODE-type solution which can be either discrete or continuous in time.

(For example, `sol.u[17][5,2]`

is the function value at the 5th x-position at the 17th timestep, and `sol(17)[5,1]`

is (I think) df/dt at t=17 for the 5th x-position.)

So, question: what are some simple commands to plot values in the (t,x) plane? Like contour plots, 3D plots (similar to plot3D in Mathematica, and so on)? Thanks for any info!