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Question: How to plot summation from a pde solution

Question:How to plot summation from a pde solution

alfarunner 90
pde pdsolve
April 29 2018
1
BVP := [4*(diff(u(x, t), t))-9*(diff(u(x, t), x, x))-5*u(x, t) = 0, u(0, t) = 0, u(6, t) = 0, u(x, 0) = sin((1/6)*Pi*x)^2];
pdsolve(BVP);
        
U := unapply(rhs(sol), [x, t]);
  
plot3d(eval(U(x, t), infinity = 20), x = 0 .. 6, t = 0 .. 4);
Warning, unable to evaluate the function to numeric values in the region; see the plotting command's help page to ensure the calling sequence is correct

 
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