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Homework Help: Help with Ray-tracing and Extensions

  1. Oct 10, 2011 #1
    1. I am looking for some examples on how to perform ray-tracing and extensions for a function.

    u_{tt}=u_{xx} for 0<x<1 with homogeneous Dirichlet conditions (i.e., the boundary conditions are that u(t,0) and u(t,1) are 0 for all t). As initial data we assume that u(0,x)= x for 0 < x < 1/3 and = (1-x)/2 for 1/3 < x < 1 and that u_t(0,x)=0 for every x.

    Extend the initial data as odd across x=0 and across x=1 and use the d'Alembert formula to compute u(3,1/2).

    Use `ray tracing' starting with your answer to (a) (with reflection at the boundaries) to compute u(3,1/2).

    2. D'Alambert Formula u(t,x)=f(x+ct)+g(x-ct)

    3. I used D'alambert formula to solve for u(t,x) for the two ranges of "x". I created a graph plotting "u" not sure where to go from there.
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
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