/usr/include/dolfin/function/LagrangeInterpolator.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 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 | // Copyright (C) 2014 Mikael Mortensen
//
// 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/>.
//
//
// First added: 2014-02-12
// Last changed:
#ifndef __LAGRANGE_INTERPOLATOR_H
#define __LAGRANGE_INTERPOLATOR_H
namespace dolfin
{
// Comparison operator for hashing coordinates. Note that two
// coordinates are considered equal if equal to within specified
// tolerance.
struct lt_coordinate
{
lt_coordinate(double tolerance) : TOL(tolerance) {}
bool operator() (const std::vector<double>& x,
const std::vector<double>& y) const
{
std::size_t n = std::max(x.size(), y.size());
for (std::size_t i = 0; i < n; ++i)
{
double xx = 0.0;
double yy = 0.0;
if (i < x.size())
xx = x[i];
if (i < y.size())
yy = y[i];
if (xx < (yy - TOL))
return true;
else if (xx > (yy + TOL))
return false;
}
return false;
}
// Tolerance
const double TOL;
};
class Expression;
class Function;
class GenericDofMap;
class Mesh;
class FunctionSpace;
/// This class interpolates efficiently from a GenericFunction
/// to a Lagrange Function
class LagrangeInterpolator
{
public:
/// Interpolate Expression
///
/// *Arguments*
/// u (_Function_)
/// The resulting Function
/// u0 (_Expression_)
/// The Expression to be interpolated.
void interpolate(Function& u, const Expression& u0);
/// Interpolate function (on possibly non-matching meshes)
///
/// *Arguments*
/// u (_Function_)
/// The resulting Function
/// u0 (_Function_)
/// The Function to be interpolated.
void interpolate(Function& u, const Function& u0);
private:
// Create a map from coordinates to a list of dofs that share the coordinate
std::map<std::vector<double>, std::vector<std::size_t>, lt_coordinate >
tabulate_coordinates_to_dofs(const GenericDofMap& dofmap, const Mesh& mesh);
// Create a map from dof to its component index in Mixed Space
void extract_dof_component_map(boost::unordered_map<std::size_t, std::size_t>&
dof_component_map, const FunctionSpace& V, int* component);
// Return true if point lies within bounding box
static bool in_bounding_box(const std::vector<double>& point,
const std::vector<double>& bounding_box,
const double tol);
};
}
#endif
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