Noble model. 1D travelling waves

Again we include diffusion term D Δu = D ∂2u / ∂x2 to get running waves (D = 0.001 cm2/ms).
For Δx = 0.015 cm you can see alternans. For Δx = 0.01 cm waves can not propagate.
Δtms Δxcm speedcm/ms

delay it fps
This script uses simple explicit algorithm. It makes it time steps per frame. x length is 1024Δx. Set it = 1000 to test wave speed.
Heart rhythms     updated 6 Mar 2012