For the same wave equation as in project 1:
1. Implement the 3-level scheme described in class Jan 23.
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( * * * )
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2. Implement data setting that gives a *moving* initial
data set.
3. Implement periodic, implement wave extraction boundary
conditions.
4. Investigate the convergence properties of the computational
solution. Analytic solutions are easy for the wave equation.
Show that the computational results converge to second order
by comparison to the analytical results.