2.2.7 Parabolic PDE: example
Examples for ``spikes'' initial condition (red) and periodic boundaries
are displayed in Fig. 3
for two time-steps
=0.1, 0.5 after 500 or 100 steps, respectively
Euler scheme for heat equation.
The slightly too large time-step (0.5) causes the non-decaying spurious oscillations
in the right panel.
The simple discretization (85) gives reasonable results.