Hi, I have a solution vector with locally owned and locally relevant dofs. I want to compute its L2-norm. Using the l2_norm() on it caused a Trilinos error (I was going to compute the squared of the L2 norm, then do an MPI Allreduce on the resulting values).
So, I decided to code it "by hand" as follows: double norm_squared = 0.; const unsigned int start_ = (dist_solution.local_range().first), end_ = (dist_solution.local_range().second); for (unsigned int i = start_; i < end_; ++i) norm_squared += std::pow(dist_solution(i),2); double norm_global =0.; MPI_Allreduce(&norm_squared, &norm_global, 1, MPI_DOUBLE, MPI_SUM, mpi_communicator); norm_global = std::sqrt(norm_global); Even though this works, I was wondering if there is a better way to do this? Cheers, --jean -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to dealii+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
