Hi guys,
I'm passing through your very nice tutorial and have encountered the
following problem in Step 4.
It is claimed (and seems to be) that step-4 is a truly dimension
independent code to solve Poisson equation.
But If I set dim=1 then I get a very strange solution which does not
even satisfy boundary values and is not symmetric around x=0.
In 1D the step-4 equation is: -u'' = 4 x^4, u(-1) = u(1) = 1. Its
solution must be: u(x) = -4/30 x^6 + 68/60.
What is wrong with dim=1 in step-4 code?
Thanks!
Ivan
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