/usr/include/dolfin/la/PETScKrylovMatrix.h is in libdolfin1.0-dev 1.0.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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/>.
//
// Modified by Andy R. Terrel, 2005.
//
// First added: 2005-01-17
// Last changed: 2010-08-28
#ifndef __PETSC_KRYLOV_MATRIX_H
#define __PETSC_KRYLOV_MATRIX_H
#ifdef HAS_PETSC
#include <string>
#include <dolfin/common/types.h>
#include "PETScBaseMatrix.h"
namespace dolfin
{
class PETScVector;
/// This class represents a matrix-free matrix of dimension m x m.
/// It is a simple wrapper for a PETSc shell matrix. The interface
/// is intentionally simple. For advanced usage, access the PETSc
/// Mat pointer using the function mat() and use the standard PETSc
/// interface.
///
/// The class PETScKrylovMatrix enables the use of Krylov subspace
/// methods for linear systems Ax = b, without having to explicitly
/// store the matrix A. All that is needed is that the user-defined
/// PETScKrylovMatrix implements multiplication with vectors. Note that
/// the multiplication operator needs to be defined in terms of
/// PETSc data structures (Vec), since it will be called from PETSc.
class PETScKrylovMatrix : public PETScBaseMatrix
{
public:
/// Constructor
PETScKrylovMatrix();
/// Create a virtual matrix matching the given vectors
PETScKrylovMatrix(uint m, uint n);
/// Destructor
virtual ~PETScKrylovMatrix();
/// Resize virtual matrix
void resize(uint m, uint n);
/// Compute product y = Ax
virtual void mult(const PETScVector& x, PETScVector& y) const = 0;
/// Return informal string representation (pretty-print)
std::string str(bool verbose) const;
};
}
#endif
#endif
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