/usr/include/libmesh/dense_matrix_base.h is in libmesh-dev 0.7.1-2ubuntu1.
This file is owned by root:root, with mode 0o644.
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// 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 __dense_matrix_base_h__
#define __dense_matrix_base_h__
// C++ includes
// Local Includes
#include "libmesh_common.h"
#include "compare_types.h"
namespace libMesh
{
// Forward Delcarations
template <typename T> class DenseVectorBase;
/**
* Defines an abstract dense matrix base class for use in Finite Element-type
* computations. Specialized dense matrices, for example DenseSubMatrices,
* can be derived from this class.
*
* @author John W. Peterson, 2003
*/
template<typename T>
class DenseMatrixBase
{
protected:
/**
* Constructor. Creates a dense matrix of dimension \p m by \p n.
* Protected so that there is no way the user can create one.
*/
DenseMatrixBase(const unsigned int m=0,
const unsigned int n=0) : _m(m), _n(n) {};
public:
/**
* Destructor. Empty.
*/
virtual ~DenseMatrixBase() {};
/**
* Set every element in the matrix to 0. You must redefine
* what you mean by zeroing the matrix since it depends on
* how your values are stored.
*/
virtual void zero() = 0;
/**
* @returns the \p (i,j) element of the matrix.
* Since internal data representations may differ, you
* must redefine this function.
*/
virtual T el(const unsigned int i,
const unsigned int j) const = 0;
/**
* @returns the \p (i,j) element of the matrix as a writeable reference.
* Since internal data representations may differ, you
* must redefine this function.
*/
virtual T & el(const unsigned int i,
const unsigned int j) = 0;
/**
* Performs the operation: (*this) <- M2 * (*this)
*/
virtual void left_multiply (const DenseMatrixBase<T>& M2) = 0;
/**
* Performs the operation: (*this) <- (*this) * M3
*/
virtual void right_multiply (const DenseMatrixBase<T>& M3) = 0;
/**
* @returns the row-dimension of the matrix.
*/
unsigned int m() const { return _m; }
/**
* @returns the column-dimension of the matrix.
*/
unsigned int n() const { return _n; }
/**
* Pretty-print the matrix, by default to \p libMesh::out.
*/
void print(std::ostream& os = libMesh::out) const;
/**
* Formatted print as above but allows you to do
* DenseMatrix K;
* libMesh::out << K << std::endl;
*/
friend std::ostream& operator << (std::ostream& os, const DenseMatrixBase<T>& m)
{
m.print(os);
return os;
}
/**
* Prints the matrix entries with more decimal places in
* scientific notation.
*/
void print_scientific(std::ostream& os) const;
/**
* Adds \p factor to every element in the matrix.
* This should only work if T += T2 * T3 is valid C++ and
* if T2 is scalar. Return type is void
*/
template <typename T2, typename T3>
typename boostcopy::enable_if_c<
ScalarTraits<T2>::value, void >::type
add (const T2 factor,
const DenseMatrixBase<T3>& mat);
protected:
/**
* Performs the computation M1 = M2 * M3 where:
* M1 = (m x n)
* M2 = (m x p)
* M3 = (p x n)
*/
void multiply (DenseMatrixBase<T>& M1,
const DenseMatrixBase<T>& M2,
const DenseMatrixBase<T>& M3);
/**
* Condense-out the \p (i,j) entry of the matrix, forcing
* it to take on the value \p val. This is useful in numerical
* simulations for applying boundary conditions. Preserves the
* symmetry of the matrix.
*/
void condense(const unsigned int i,
const unsigned int j,
const T val,
DenseVectorBase<T>& rhs);
/**
* The row dimension.
*/
unsigned int _m;
/**
* The column dimension.
*/
unsigned int _n;
};
template<typename T>
template<typename T2, typename T3>
inline
typename boostcopy::enable_if_c<
ScalarTraits<T2>::value, void >::type
DenseMatrixBase<T>::add (const T2 factor,
const DenseMatrixBase<T3>& mat)
{
libmesh_assert (this->m() == mat.m());
libmesh_assert (this->n() == mat.n());
for (unsigned int j=0; j<this->n(); j++)
for (unsigned int i=0; i<this->m(); i++)
this->el(i,j) += factor*mat.el(i,j);
}
} // namespace libMesh
#endif // #ifndef __dense_matrix_base_h__
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