Hello all, this question may have arisen before... but how can one get (using deal.ii) from the discrete solution vector (essentially the numerical solution values at the DoF points for my DG implementation) the expansion coefficients for the solution on each element? That is, I want c_i for each active cell k, where
u(x) |_k = \sum_i c_i \Psi_i(x) and Psi_i(x) are the canonical functions of the local Lagrange basis. I know this amounts to multiplication to a Vandermonde-like interpolation matrix, but I was wondering if there is some automatic support for this in deal.ii. if I am making some wrong assumptions on how deal.ii stores the numerical solution (say, in step-12 or step-39), please let me know. thank you! -- Mihai
_______________________________________________ dealii mailing list http://poisson.dealii.org/mailman/listinfo/dealii
