> I had a closer look on the system matrix and rhs, when multiplying the > exact solution on it and noticed, that transposing the system matrix > actually gives the correct matrix.
When multiplying your equation with a test function, do you multiply from the left or from the right? To get the right matrix, you have to multiply from the left (and the tutorial programs are careful to do so) whereas most papers and books in the literature typically multiply from the right, giving the transpose of the matrix you want to solve. W. ------------------------------------------------------------------------- Wolfgang Bangerth email: [email protected] www: http://www.math.tamu.edu/~bangerth/ _______________________________________________ dealii mailing list http://poisson.dealii.org/mailman/listinfo/dealii
