/usr/include/dolfin/fem/PointSource.h is in libdolfin-dev 2017.2.0.post0-2.
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 88 89 90 91 92 93 94 95 96 97 | // Copyright (C) 2011 Anders Logg
//
// 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/>.
#ifndef __POINT_SOURCE_H
#define __POINT_SOURCE_H
#include <memory>
#include <utility>
#include <vector>
#include <dolfin/geometry/Point.h>
namespace dolfin
{
// Forward declarations
class FunctionSpace;
class GenericMatrix;
class GenericVector;
class Mesh;
/// This class provides an easy mechanism for adding a point
/// quantities (Dirac delta function) to variational problems. The
/// associated function space must be scalar in order for the inner
/// product with the (scalar) Dirac delta function to be well
/// defined. For each of the constructors, Points passed to
/// PointSource will be copied.
///
/// Note: the interface to this class will likely change.
class PointSource
{
public:
/// Create point source at given point of given magnitude
PointSource(std::shared_ptr<const FunctionSpace> V, const Point& p,
double magnitude=1.0);
/// Create point sources at given points of given magnitudes
PointSource(std::shared_ptr<const FunctionSpace> V,
const std::vector<std::pair<const Point*, double>> sources);
/// Create point source at given point of given magnitude
PointSource(std::shared_ptr<const FunctionSpace> V0,
std::shared_ptr<const FunctionSpace> V1,
const Point& p,
double magnitude=1.0);
/// Create point sources at given points of given magnitudes
PointSource(std::shared_ptr<const FunctionSpace> V0,
std::shared_ptr<const FunctionSpace> V1,
const std::vector<std::pair<const Point*, double>> sources);
/// Destructor
~PointSource();
/// Apply (add) point source to right-hand side vector
void apply(GenericVector& b);
/// Apply (add) point source to matrix
void apply(GenericMatrix& A);
private:
// FIXME: This should probably be static
// Collective MPI method to distribute sources to correct processes
void distribute_sources(const Mesh& mesh,
const std::vector<std::pair<Point, double>>& sources);
// Check that function space is scalar
static void check_space_supported(const FunctionSpace& V);
// The function spaces
std::shared_ptr<const FunctionSpace> _function_space0;
std::shared_ptr<const FunctionSpace> _function_space1;
// Source term - pair of points and magnitude
std::vector<std::pair<Point, double>> _sources;
};
}
#endif
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