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/*
************************************************************************
EpetraExt: Extended Linear Algebra Services Package
Copyright (2001) Sandia Corporation
Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
license for use of this work by or on behalf of the U.S. Government.
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
Questions? Contact Michael A. Heroux (maherou@sandia.gov)
************************************************************************
*/
//@HEADER
#ifndef EPETRAEXT_BLOCKCRSMATRIX_H
#define EPETRAEXT_BLOCKCRSMATRIX_H
#include <vector>
#include "Epetra_CrsMatrix.h"
//! EpetraExt::BlockCrsMatrix: A class for constructing a distributed block matrix.
/*! The EpetraExt::BlockCrsMatrix allows construction of a block matrix made up of Epetra_CrsMatrix blocks as well as access to the full systems as a Epetra_CrsMatrix. It derives from and extends the Epetra_CrsMatrix class
<b>Constructing EpetraExt::BlockCrsMatrix objects</b>
*/
namespace EpetraExt {
class BlockCrsMatrix: public Epetra_CrsMatrix {
public:
//@{ \name Constructors/Destructor.
//! BlockCrsMatrix constuctor with one block row per processor.
/*! Creates a BlockCrsMatrix object and allocates storage.
\param In
BaseGraph - Graph determining individual block structure, can be distrib. over subset of proc.'s
\param In
RowStencil - Describes the stencil for block row on this processor (i.e. (-1 0 1) centered difference)
\param In
RowIndex - Defines the index used for this block row.
*/
BlockCrsMatrix( const Epetra_CrsGraph & BaseGraph, const std::vector<int> & RowStencil, int RowIndex, const Epetra_Comm & GlobalComm );
//! BlockCrsMatrix constuctor with multiple block rows per processor.
/*! Creates a BlockCrsMatrix object and allocates storage.
\param In
BaseGraph - Graph determining individual block structure, can be distrib. over subset of proc.'s
\param In
RowStencil - Describes the stencil for block row on this processor (i.e. (-1 0 1) centered difference)
\param In
RowIndices - Defines the indices used for this block row.
*/
BlockCrsMatrix( const Epetra_CrsGraph & BaseGraph, const std::vector< std::vector<int> > & RowStencil, const std::vector<int> & RowIndices, const Epetra_Comm & GlobalComm );
BlockCrsMatrix( const Epetra_RowMatrix & BaseMatrix, const std::vector< std::vector<int> > & RowStencil, const std::vector<int> & RowIndices, const Epetra_Comm & GlobalComm );
//! Copy constructor.
BlockCrsMatrix( const BlockCrsMatrix & Matrix );
//! Destructor
virtual ~BlockCrsMatrix();
//@}
//! Local Stencil Info
const std::vector<int> & Stencil( int i = 0 ) { return RowStencil_[i]; }
//! RowIndex
int RowIndex( int i = 0 ) { return RowIndices_[i]; }
//! Routine for loading a base matrices values into the large Block Matrix
//! The Row and Col arguments are indices into RowStencil
void LoadBlock(const Epetra_RowMatrix & BaseMatrix, const int Row, const int Col);
//! Routine for summing base matrices values into the large Block Matrix
//! The Row and Col arguments are indices into RowStencil
void SumIntoBlock(double alpha, const Epetra_RowMatrix & BaseMatrix, const int Row, const int Col);
//! Sum Entries into Block matrix using base-matrix numbering plus block Row and Col
//! The Row and Col arguments are indices into RowStencil
void BlockSumIntoGlobalValues(const int BaseRow, int NumIndices,
double* Values, const int* Indices, const int Row, const int Col);
void BlockReplaceGlobalValues(const int BaseRow, int NumIndices,
double* Values, const int* Indices, const int Row, const int Col);
void BlockExtractGlobalRowView(const int BaseRow, int& NumEntries,
double*& Values, const int Row, const int Col);
void ExtractBlock(Epetra_CrsMatrix & BaseMatrix, const int Row, const int Col);
protected:
Epetra_CrsGraph BaseGraph_;
std::vector< std::vector<int> > RowStencil_;
std::vector<int> RowIndices_;
int Offset_;
};
} //namespace EpetraExt
#endif /* EPETRA_CRSMATRIX_H */
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