HI all
I would like to solve the Poisson equation in 3 dimension of the form: -Lu=f where the function f has the form L is the laplacian operator. f(x,y,z)= -2*(1-y)*y*(1-z)*z-2*(1-x)*x*(1-z)*z-2*(1-x)*x*(1-y)*y the domain is a unite cube. boundary condition: u=0 on the boundary u=0 Then i would like to plot the energie norm of the error, Any hint? FKM
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