Hi, I want to solve the p.d.e.:
##\frac{\partial u(x,t)}{\partial t} - \frac{\partial^2 u(x,t)}{\partial x^2}=f(x,t)##,
with periodic boundary conditions ##u(x,t)=u(L,t)##.
using a second order Runge-Kutta method in time. However, I am not having the proper results when I apply this method to...