/usr/include/dolfin/fem/fem_utils.h is in libdolfin-dev 2017.2.0.post0-2.
This file is owned by root:root, with mode 0o644.
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//
// 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 __FEM_UTILS_H
#define __FEM_UTILS_H
#include <vector>
#include <dolfin/common/types.h>
namespace dolfin
{
// Forward declarations
class Mesh;
class FunctionSpace;
class Function;
class MeshGeometry;
/// Return a map between dof indices and vertex indices
///
/// Only works for FunctionSpace with dofs exclusively on vertices.
/// For mixed FunctionSpaces vertex index is offset with the number
/// of dofs per vertex.
///
/// In parallel the returned map maps both owned and unowned dofs
/// (using local indices) thus covering all the vertices. Hence the
/// returned map is an inversion of _vertex_to_dof_map_.
///
/// @param space (_FunctionSpace_)
/// The FunctionSpace for what the dof to vertex map should
/// be computed for
///
/// @return std::vector<std::size_t>
/// The dof to vertex map
std::vector<std::size_t> dof_to_vertex_map(const FunctionSpace& space);
/// Return a map between vertex indices and dof indices
///
/// Only works for FunctionSpace with dofs exclusively on vertices.
/// For mixed FunctionSpaces dof index is offset with the number of
/// dofs per vertex.
///
/// @param space (_FunctionSpace_)
/// The FunctionSpace for what the vertex to dof map should
/// be computed for
///
/// @return std::vector<dolfin::la_index>
/// The vertex to dof map
std::vector<dolfin::la_index> vertex_to_dof_map(const FunctionSpace& space);
/// Sets mesh coordinates from function
///
/// Mesh connectivities d-0, d-1, ..., d-r are built on function mesh
/// (where d is topological dimension of the mesh and r is maximal
/// dimension of entity associated with any coordinate node). Consider
/// clearing unneeded connectivities when finished.
///
/// @param geometry (_MeshGeometry_)
/// Mesh geometry to be set
/// @param position (_Function_)
/// Vectorial Lagrange function with matching degree and mesh
void set_coordinates(MeshGeometry& geometry, const Function& position);
/// Stores mesh coordinates into function
///
/// Mesh connectivities d-0, d-1, ..., d-r are built on function mesh
/// (where d is topological dimension of the mesh and r is maximal
/// dimension of entity associated with any coordinate node). Consider
/// clearing unneeded connectivities when finished.
///
/// @param position (_Function_)
/// Vectorial Lagrange function with matching degree and mesh
/// @param geometry (_MeshGeometry_)
/// Mesh geometry to be stored
void get_coordinates(Function& position, const MeshGeometry& geometry);
/// Creates mesh from coordinate function
///
/// Topology is given by underlying mesh of the function space and
/// geometry is given by function values. Hence resulting mesh
/// geometry has a degree of the function space degree. Geometry of
/// function mesh is ignored.
///
/// Mesh connectivities d-0, d-1, ..., d-r are built on function mesh
/// (where d is topological dimension of the mesh and r is maximal
/// dimension of entity associated with any coordinate node). Consider
/// clearing unneeded connectivities when finished.
///
/// @param coordinates
/// (_Function_)
/// Vector Lagrange function of any degree
///
/// @return Mesh
/// The mesh
Mesh create_mesh(Function& coordinates);
}
#endif
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