/usr/include/dolfin/la/BlockMatrix.h is in libdolfin-dev 1.4.0+dfsg-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 | // Copyright (C) 2008 Kent-Andre Mardal
//
// This file is part of DOLFIN.
//
// DOLFIN is free software: you can 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 3 of the License, or
// (at your option) any later version.
//
// DOLFIN is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with DOLFIN. If not, see <http://www.gnu.org/licenses/>.
//
// Modified by Anders Logg, 2008.
// Modified by Garth N. Wells, 2011.
//
// First added: 2008-08-25
// Last changed: 2011-01-22
#ifndef __BLOCKMATRIX_H
#define __BLOCKMATRIX_H
#include <boost/multi_array.hpp>
#include <memory>
namespace dolfin
{
/// Forward declarations
class GenericMatrix;
class BlockMatrix
{
public:
// Constructor
BlockMatrix(std::size_t m=0, std::size_t n=0);
// Destructor
~BlockMatrix();
/// Set block
void set_block(std::size_t i, std::size_t j,
std::shared_ptr<GenericMatrix> m);
/// Get block (const version)
std::shared_ptr<const GenericMatrix>
get_block(std::size_t i, std::size_t j) const;
/// Get block
std::shared_ptr<GenericMatrix> get_block(std::size_t i, std::size_t j);
/// Return size of given dimension
std::size_t size(std::size_t dim) const;
/// Set all entries to zero and keep any sparse structure
void zero();
/// Finalize assembly of tensor
void apply(std::string mode);
/// Return informal string representation (pretty-print)
std::string str(bool verbose) const;
/// Matrix-vector product, y = Ax
void mult(const BlockVector& x, BlockVector& y,
bool transposed=false) const;
/// Create a crude explicit Schur approximation of S = D - C A^-1
/// B of (A B; C D) If symmetry != 0, then the caller promises
/// that B = symmetry * transpose(C).
std::shared_ptr<GenericMatrix>
schur_approximation(bool symmetry=true) const;
private:
boost::multi_array<std::shared_ptr<GenericMatrix>, 2> matrices;
};
}
#endif
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