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/*
-----------------------------------------------------------------------
Copyright: 2010-2016, iMinds-Vision Lab, University of Antwerp
2014-2016, CWI, Amsterdam
Contact: astra@astra-toolbox.com
Website: http://www.astra-toolbox.com/
This file is part of the ASTRA Toolbox.
The ASTRA Toolbox is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
The ASTRA Toolbox 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with the ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
-----------------------------------------------------------------------
*/
#ifndef _INC_ASTRA_SPARSEMATRIX
#define _INC_ASTRA_SPARSEMATRIX
namespace astra
{
/** This class implements a sparse matrix. It is stored as three arrays.
* The values are stored row-by-row.
* m_pfValues contains the values
* m_piColIndices contains the col indices of the values
* m_plRowStarts contains the start offsets of the rows
*/
class _AstraExport CSparseMatrix {
public:
CSparseMatrix();
// TODO: are ints large enough for width/height?
CSparseMatrix(unsigned int _iHeight, unsigned int _iWidth,
unsigned long _lSize);
/** Initialize the matrix structure.
* It does not initialize any values.
*
* @param _iHeight number of rows
* @param _iWidth number of columns
* @param _lSize maximum number of non-zero entries
* @return initialization successful?
*/
bool initialize(unsigned int _iHeight, unsigned int _iWidth,
unsigned long _lSize);
/** Destructor.
*/
~CSparseMatrix();
/** Has the matrix structure been initialized?
*
* @return initialized successfully
*/
bool isInitialized() const { return m_bInitialized; }
/** get a description of the class
*
* @return description string
*/
std::string description() const;
/** get the data for a single row. Entries are stored from left to right.
*
* @param _iRow the row
* @param _iSize the returned number of elements in the row
* @param _pfValues the values of the non-zero entries in the row
* @param _piColIndices the column indices of the non-zero entries
*/
void getRowData(unsigned int _iRow, unsigned int& _iSize,
const float32*& _pfValues, const unsigned int*& _piColIndices) const
{
assert(_iRow < m_iHeight);
unsigned long lStart = m_plRowStarts[_iRow];
_iSize = m_plRowStarts[_iRow+1] - lStart;
_pfValues = &m_pfValues[lStart];
_piColIndices = &m_piColIndices[lStart];
}
/** get the number of elements in a row
*
* @param _iRow the row
* @return number of stored entries in the row
*/
unsigned int getRowSize(unsigned int _iRow) const
{
assert(_iRow < m_iHeight);
return m_plRowStarts[_iRow+1] - m_plRowStarts[_iRow];
}
/** Matrix width
*/
unsigned int m_iHeight;
/** Matrix height
*/
unsigned int m_iWidth;
/** Maximum number of non-zero entries
*/
unsigned long m_lSize;
/** Contains the numeric values of all non-zero elements
*/
float32* m_pfValues;
/** Contains the colon index of all non-zero elements
*/
unsigned int* m_piColIndices;
/** The indices in this array point to the first element of each row in the m_pfValues array
*/
unsigned long* m_plRowStarts;
protected:
/** Is the class initialized?
*/
bool m_bInitialized;
};
}
#endif
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