/usr/include/libmesh/shell_matrix.h is in libmesh-dev 0.7.1-2ubuntu1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 | // $Id: shell_matrix.h 3874 2010-07-02 21:57:26Z roystgnr $
// The libMesh Finite Element Library.
// Copyright (C) 2002-2008 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
// This library 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 2.1 of the License, or (at your option) any later version.
// This library 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 this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#ifndef __shell_matrix_h__
#define __shell_matrix_h__
// Local includes
#include "libmesh_common.h"
#include "reference_counted_object.h"
#include "libmesh.h"
namespace libMesh
{
// forward declarations
template <typename T> class NumericVector;
/**
* Generic shell matrix, i.e. a matrix that does not define anything
* but its action on a vector. This class contains pure virtual
* members that must be overloaded in derived classes.
*
* @author Tim Kroeger, 2008
*/
template <typename T>
class ShellMatrix : public ReferenceCountedObject<ShellMatrix<T> >
{
public:
/**
* Constructor; does nothing.
*/
ShellMatrix ();
/**
* Destructor.
*/
virtual ~ShellMatrix ();
/**
* @returns \p m, the row-dimension of the matrix where the marix is
* \f$ M \times N \f$.
*/
virtual unsigned int m () const = 0;
/**
* @returns \p n, the column-dimension of the matrix where the marix
* is \f$ M \times N \f$.
*/
virtual unsigned int n () const = 0;
/**
* Multiplies the matrix with \p arg and stores the result in \p
* dest.
*/
virtual void vector_mult (NumericVector<T>& dest,
const NumericVector<T>& arg) const = 0;
/**
* Multiplies the matrix with \p arg and adds the result to \p dest.
*/
virtual void vector_mult_add (NumericVector<T>& dest,
const NumericVector<T>& arg) const = 0;
/**
* Copies the diagonal part of the matrix into \p dest.
*/
virtual void get_diagonal (NumericVector<T>& dest) const = 0;
};
//-----------------------------------------------------------------------
// ShellMatrix inline members
template <typename T>
inline
ShellMatrix<T>::ShellMatrix ()
{}
template <typename T>
inline
ShellMatrix<T>::~ShellMatrix ()
{}
} // namespace libMesh
#endif // #ifndef __shell_matrix_h__
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