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add test for DoFCellAccessor::distribute_local_to_global(local_matrix…
…,local_vector,global_matrix,global_vector)
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Yimin Jin
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Jan 18, 2024
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// --------------------------------------------------------------------- | ||
// | ||
// Copyright (C) 2021 - 2023 by the deal.II authors | ||
// | ||
// This file is part of the deal.II library. | ||
// | ||
// The deal.II library is free software; you can use it, redistribute | ||
// it, and/or modify it under the terms of the GNU Lesser General | ||
// Public License as published by the Free Software Foundation; either | ||
// version 2.1 of the License, or (at your option) any later version. | ||
// The full text of the license can be found in the file LICENSE.md at | ||
// the top level directory of deal.II. | ||
// | ||
// --------------------------------------------------------------------- | ||
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// Test DoFCellAccessor::distribute_local_to_global( | ||
// local_matrix, local_vector, global_matrix, global_vector) | ||
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#include <deal.II/grid/tria.h> | ||
#include <deal.II/grid/grid_generator.h> | ||
#include <deal.II/dofs/dof_handler.h> | ||
#include <deal.II/dofs/dof_tools.h> | ||
#include <deal.II/fe/fe_q.h> | ||
#include <deal.II/lac/dynamic_sparsity_pattern.h> | ||
#include <deal.II/lac/sparse_matrix.h> | ||
#include <deal.II/lac/full_matrix.h> | ||
#include <deal.II/lac/vector.h> | ||
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#include <iostream> | ||
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int main() | ||
{ | ||
using namespace dealii; | ||
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// create the triangulation | ||
Triangulation<2> tria; | ||
GridGenerator::hyper_cube(tria, -1, 1); | ||
tria.refine_global(1); | ||
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// distribute dofs | ||
DoFHandler<2> dof_handler(tria); | ||
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FE_Q<2> fe(1); | ||
dof_handler.distribute_dofs(fe); | ||
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// create the global matrix and global vector | ||
DynamicSparsityPattern dsp(dof_handler.n_dofs()); | ||
DoFTools::make_sparsity_pattern(dof_handler, dsp); | ||
SparsityPattern sp; | ||
sp.copy_from(dsp); | ||
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SparseMatrix<double> global_matrix(sp); | ||
Vector<double> global_vector(dof_handler.n_dofs()); | ||
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// create local matrix and local vector | ||
FullMatrix<double> local_matrix(fe.dofs_per_cell, fe.dofs_per_cell); | ||
Vector<double> local_vector(fe.dofs_per_cell); | ||
for (unsigned int i = 0; i < fe.dofs_per_cell; ++i) | ||
{ | ||
local_vector(i) = i + 1; | ||
for (unsigned int j = 0; j < fe.dofs_per_cell; ++j) | ||
local_matrix(i, j) = i * fe.dofs_per_cell + j + 1; | ||
} | ||
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// call function distribute_local_to_global() | ||
auto cell = dof_handler.begin_active(); | ||
cell->distribute_local_to_global(local_matrix, local_vector, global_matrix, global_vector); | ||
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// output the local matrix and local vector | ||
std::cout << "local matrix:" << std::endl; | ||
local_matrix.print_formatted(std::cout, 0, false); | ||
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std::cout << "local vector:" << std::endl; | ||
local_vector.print(std::cout, 0, false); | ||
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std::cout << std::endl; | ||
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// output the global matrix and global vector | ||
std::cout << "global matrix:" << std::endl; | ||
global_matrix.print_formatted(std::cout, 0, false); | ||
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std::cout << "global vector:" << std::endl; | ||
global_vector.print(std::cout, 0, false); | ||
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return 0; | ||
} |
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local matrix: | ||
1 2 3 4 | ||
5 6 7 8 | ||
9 10 11 12 | ||
13 14 15 16 | ||
local vector: | ||
1 2 3 4 | ||
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global matrix: | ||
1 2 3 4 | ||
5 6 7 8 0 0 | ||
9 10 11 12 0 0 | ||
13 14 15 16 0 0 0 0 0 | ||
0 0 0 0 | ||
0 0 0 0 0 0 | ||
0 0 0 0 | ||
0 0 0 0 0 0 | ||
0 0 0 0 | ||
global vector: | ||
1 2 3 4 0 0 0 0 0 |