How to start Partial Differential Equation (PDE) Solving in Julia for modified Wave Equation

[ChrisRackauckas]

@CosmoProf

The higher orders library for finite difference is extremely useful; is there some
theoretical resource or documentation explaining how they actually calculate
d^2/dx^2 (spatial 2nd derivative) for the n>2 orders?

It’s just Fornberg’s algorithm: https://web.njit.edu/~jiang/math712/fornberg.pdf