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/***********************************************/
/**
* @file matrixGeneratorDiagonal.h
*
* @brief Exctract the diagonal of a matrix.
*
* @author Andreas Kvas
* @date 2018-09-01
*
*/
/***********************************************/
#ifndef __GROOPS_MATRIXGENERATORDIAGONAL__
#define __GROOPS_MATRIXGENERATORDIAGONAL__
// Latex documentation
#ifdef DOCSTRING_MatrixGenerator
static const char *docstringMatrixGeneratorDiagonal = R"(
\subsection{Diagonal}
Extract the diagonal or subdiagnoal ($n\times 1$ vector) of a matrix.
The zero \config{diagonal} means the main diagonal, a positive value the superdiagonal,
and a negative the subdiagonal.
)";
#endif
/***********************************************/
#include "base/import.h"
#include "matrixGenerator.h"
/***** CLASS ***********************************/
/** @brief Exctract the diagonal of a matrix.
* @ingroup matrixGeneratorGroup
* @see MatrixGenerator */
class MatrixGeneratorDiagonal : public MatrixGeneratorBase
{
MatrixGeneratorPtr matrix;
Int index;
public:
MatrixGeneratorDiagonal(Config &config);
void compute(Matrix &A, UInt rowsBefore, UInt columnsBefore, UInt &startRow, UInt &startCol);
};
/***********************************************/
/***** Inlines *********************************/
/***********************************************/
inline MatrixGeneratorDiagonal::MatrixGeneratorDiagonal(Config &config)
{
try
{
readConfig(config, "matrix", matrix, Config::MUSTSET, "", "");
readConfig(config, "diagonal", index, Config::DEFAULT, "0", "zero: main diagonal, positive: superdiagonal, negative: subdiagonal");
if(isCreateSchema(config)) return;
}
catch(std::exception &e)
{
GROOPS_RETHROW(e)
}
}
/***********************************************/
inline void MatrixGeneratorDiagonal::compute(Matrix &A, UInt /*rowsBefore*/, UInt /*columnsBefore*/, UInt &/*startRow*/, UInt &/*startCol*/)
{
try
{
A = matrix->compute();
Vector d(std::min(A.columns(), A.rows()) - std::abs(index));
for(UInt k = 0; k<d.rows(); k++)
d(k) = A(k-std::min(0, index), k+std::max(0, index));
A = d;
}
catch(std::exception &e)
{
GROOPS_RETHROW(e)
}
}
/***********************************************/
#endif
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