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/***********************************************/
/**
* @file matrixGeneratorRankKUpdate.h
*
* @brief Rank k update (A^T*A).
*
* @author Torsten Mayer-Guerr
* @date 2019-09-01
*
*/
/***********************************************/
#ifndef __GROOPS_MATRIXGENERATORRANKKUPDATE__
#define __GROOPS_MATRIXGENERATORRANKKUPDATE__
// Latex documentation
#ifdef DOCSTRING_MatrixGenerator
static const char *docstringMatrixGeneratorRankKUpdate = R"(
\subsection{RankKUpdate}
Symmetric matrix from rank k update: $\M A^T\M A$.
)";
#endif
/***********************************************/
#include "base/import.h"
#include "matrixGenerator.h"
/***** CLASS ***********************************/
/** @brief Rank k update (A^T*A).
* @ingroup matrixGeneratorGroup
* @see MatrixGenerator */
class MatrixGeneratorRankKUpdate : public MatrixGeneratorBase
{
Double factor;
MatrixGeneratorPtr matrix;
public:
MatrixGeneratorRankKUpdate(Config &config);
void compute(Matrix &A, UInt rowsBefore, UInt columnsBefore, UInt &startRow, UInt &startCol);
};
/***********************************************/
/***** Inlines *********************************/
/***********************************************/
inline MatrixGeneratorRankKUpdate::MatrixGeneratorRankKUpdate(Config &config)
{
try
{
readConfig(config, "matrix", matrix, Config::MUSTSET, "", "");
readConfig(config, "factor", factor, Config::DEFAULT, "1.0", "");
if(isCreateSchema(config)) return;
}
catch(std::exception &e)
{
GROOPS_RETHROW(e)
}
}
/***********************************************/
inline void MatrixGeneratorRankKUpdate::compute(Matrix &N, UInt /*rowsBefore*/, UInt /*columnsBefore*/, UInt &/*startRow*/, UInt &/*startCol*/)
{
try
{
Matrix A = matrix->compute();
N = Matrix(A.columns(), Matrix::SYMMETRIC);
rankKUpdate(factor, A, N);
fillSymmetric(N);
}
catch(std::exception &e)
{
GROOPS_RETHROW(e)
}
}
/***********************************************/
#endif
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