Traffic flow example.
Variable coefficient advection equation -- conservative advection equation
The velocity u(x) in cell i is stored in aux(i,1) and is set in setaux. The velocity is piecewise constant with a jump at x=0.
Two different Riemann solvers rp1advcon.f and rp1adv3.f can be compared.
Plot the trajectories of cars (as in Figure 9.3) using trackcars.m
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