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Question: Error, (in pdsolve/numeric/process_PDEs) number of dependent variables and number of PDE must be the same

Question:Error, (in pdsolve/numeric/process_PDEs) number of dependent variables and number of PDE must be the same

Kros 5 Maple
pde numeric pdsolve differential-equations
March 31 2020
1

Error, (in pdsolve/numeric/process_PDEs) number of dependent variables and number of PDE must be the same

restart;
PDE := diff(u(x, t), t) - Laplacian(u(x, t), [x]) - u(x, t) + x - 2*sin(2*x)*cos(x) = 0;

IBC := D[1](u)(Pi/2, t) = 1, u(0, t) = 0, u(x, 0) = x;

pds := pdsolve(eval(PDE), {IBC}, type = numeric);
Error, (in pdsolve/numeric/process_PDEs) number of dependent variables and number of PDE must be the same
 
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