Properly size arguments to MGTools::count_dofs_per_block().

git-svn-id: https://svn.dealii.org/trunk@20328 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/deal.II/source/multigrid/mg_transfer_block.cc b/deal.II/deal.II/source/multigrid/mg_transfer_block.cc
index 9684b3668c99a90366ab51835b476c4f4f5f06f4..c2a149d0bb4947d7204829c45c6ca4d5d5fb1bed 100644 (file)
--- a/deal.II/deal.II/source/multigrid/mg_transfer_block.cc
+++ b/deal.II/deal.II/source/multigrid/mg_transfer_block.cc
@@ -227,7 +227,8 @@ void MGTransferBlockBase::build_matrices (
       mg_block[i] = numbers::invalid_unsigned_int;
 
                                   // Compute the lengths of all blocks
-  sizes.resize(n_levels);
+  sizes.clear ();
+  sizes.resize(n_levels, std::vector<unsigned int>(fe.n_blocks()));
   MGTools::count_dofs_per_block(mg_dof, sizes);
 
                                   // Fill some index vectors