Solve wave equation with PDEPE function

2017 10 29
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Hello everyone,
I would like to use pdepe for solving a wave equation 1D space (d2y/dx2 = C*d2y/dt2), so it looks good. But I don't really understand where the diffusion coefficient is ?
But I'm really not understanding how to use the PDEPE function, all the examples I see, the equation is different (dy/dx = C*d2y/dt2).
Thanks for all...

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