Hi Ivan, In 1D, the boundary is not any more connected like in 2D or 3D. Therefore, you have to pass two boundary colors to the interpolate_boundary_values function.
Thomas P.S. You will get the same "errors" in step-3 and step-5, too. > 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 > > _______________________________________________ > dealii mailing list http://poisson.dealii.org/mailman/listinfo/dealii > _______________________________________________ dealii mailing list http://poisson.dealii.org/mailman/listinfo/dealii
