Line data    Source code

       1             : // The libMesh Finite Element Library.
       2             : // Copyright (C) 2002-2025 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
       3             : 
       4             : // This library is free software; you can redistribute it and/or
       5             : // modify it under the terms of the GNU Lesser General Public
       6             : // License as published by the Free Software Foundation; either
       7             : // version 2.1 of the License, or (at your option) any later version.
       8             : 
       9             : // This library is distributed in the hope that it will be useful,
      10             : // but WITHOUT ANY WARRANTY; without even the implied warranty of
      11             : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12             : // Lesser General Public License for more details.
      13             : 
      14             : // You should have received a copy of the GNU Lesser General Public
      15             : // License along with this library; if not, write to the Free Software
      16             : // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
      17             : 
      18             : #include "libmesh/lumped_mass_matrix.h"
      19             : #include "libmesh/numeric_vector.h"
      20             : 
      21             : // C++ Includes
      22             : #include <cmath>
      23             : #include <memory>
      24             : 
      25             : namespace libMesh
      26             : {
      27             : 
      28             : template <typename T>
      29         213 : LumpedMassMatrix<T>::LumpedMassMatrix(const Parallel::Communicator & comm_in)
      30         213 :   : DiagonalMatrix<T>(comm_in)
      31             : {
      32          79 : }
      33             : 
      34             : template <typename T>
      35             : std::unique_ptr<SparseMatrix<T>>
      36          71 : LumpedMassMatrix<T>::zero_clone() const
      37             : {
      38             :   // Make empty copy with matching comm
      39          73 :   auto mat_copy = std::make_unique<LumpedMassMatrix<T>>(this->comm());
      40             : 
      41             :   // Initialize copy with our same nonzero structure, and explicitly
      42             :   // zero values using fast == false.
      43          71 :   mat_copy->init(*this, /*fast=*/false);
      44             : 
      45          73 :   return mat_copy;
      46          67 : }
      47             : 
      48             : template <typename T>
      49             : std::unique_ptr<SparseMatrix<T>>
      50          71 : LumpedMassMatrix<T>::clone() const
      51             : {
      52             :   // Make empty copy with matching comm
      53          73 :   auto mat_copy = std::make_unique<LumpedMassMatrix<T>>(this->comm());
      54             : 
      55             :   // Make copy of our diagonal
      56          73 :   auto diag_copy = this->_diagonal->clone();
      57             : 
      58             :   // Swap diag_copy with diagonal in mat_copy
      59           4 :   *mat_copy = std::move(*diag_copy);
      60             : 
      61          73 :   return mat_copy;
      62          67 : }
      63             : 
      64             : template <typename T>
      65             : void
      66         453 : LumpedMassMatrix<T>::set(const numeric_index_type i,
      67             :                          const numeric_index_type libmesh_dbg_var(j),
      68             :                          const T value)
      69             : {
      70           5 :   libmesh_assert_msg(i == j, "Set in a lumped mass matrix really only makes sense for i == j");
      71         463 :   this->_diagonal->set(i, std::abs(value));
      72         453 : }
      73             : 
      74             : template <typename T>
      75             : void
      76        3911 : LumpedMassMatrix<T>::add(const numeric_index_type i, const numeric_index_type /*j*/, const T value)
      77             : {
      78        3924 :   this->_diagonal->add(i, std::abs(value));
      79        3911 : }
      80             : 
      81             : template <typename T>
      82             : void
      83           0 : LumpedMassMatrix<T>::add(const T a, const SparseMatrix<T> & X)
      84             : {
      85           0 :   if (dynamic_cast<const LumpedMassMatrix<T> *>(&X))
      86             :   {
      87           0 :     auto x_diagonal = this->_diagonal->zero_clone();
      88           0 :     X.get_diagonal(*x_diagonal);
      89           0 :     this->_diagonal->add(a, *x_diagonal);
      90           0 :   }
      91             :   else
      92           0 :     libmesh_error_msg("Unsupported matrix type passed to LumpedMassMatrix::add");
      93           0 : }
      94             : 
      95             : template <typename T>
      96             : LumpedMassMatrix<T> &
      97           0 : LumpedMassMatrix<T>::operator=(const NumericVector<T> & vec)
      98             : {
      99           0 :   *this->_diagonal = vec;
     100           0 :   return *this;
     101             : }
     102             : 
     103             : template <typename T>
     104             : LumpedMassMatrix<T> &
     105           4 : LumpedMassMatrix<T>::operator=(NumericVector<T> && vec)
     106             : {
     107          71 :   this->_diagonal->swap(vec);
     108          71 :   return *this;
     109             : }
     110             : 
     111             : template class LIBMESH_EXPORT LumpedMassMatrix<Number>;
     112             : 
     113             : } // namespace libMesh