Trk::ProjectionMatricesSet Node1 Trk::ProjectionMatricesSet - m_maxdim + ProjectionMatricesSet() + expansionMatrix() + reductionMatrix() + accessor() Node2 std::vector< std::vector < int > > Node2->Node1 -m_accessors Node3 std::vector< int > + elements Node3->Node2 +elements Node4 std::vector< Amg::MatrixX > + elements Node4->Node1 -m_expansions -m_reductions