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// Gmsh - Copyright (C) 1997-2020 C. Geuzaine, J.-F. Remacle
//
// See the LICENSE.txt file for license information. Please report all
// issues on https://gitlab.onelab.info/gmsh/gmsh/issues.
#ifndef EIGEN_SOLVER_H
#define EIGEN_SOLVER_H
#include <string>
#include <complex>
#include "GmshConfig.h"
#include "GmshMessage.h"
#include "dofManager.h"
#if defined(HAVE_SLEPC)
#include "linearSystemPETSc.h"
class eigenSolver {
private:
linearSystemPETSc<double> *_sysA, *_sysB;
bool _hermitian;
std::vector<std::complex<double> > _eigenValues;
std::vector<std::vector<std::complex<double> > > _eigenVectors;
void _check(int ierr) const;
public:
eigenSolver(dofManager<double> *manager, std::string A, std::string B = "",
bool hermitian = true);
eigenSolver(linearSystemPETSc<double> *A, linearSystemPETSc<double> *B = NULL,
bool hermitian = true);
bool solve(int numEigenValues = 0, std::string which = "",
std::string method = "krylovschur", double tolVal = 1.e-7,
int iterMax = 20);
int getNumEigenValues() { return _eigenValues.size(); }
int getNumberEigenvectors() { return _eigenVectors.size(); }
std::complex<double> getEigenValue(int num) { return _eigenValues[num]; }
std::complex<double> getEigenVectorComp(int num, int com)
{
return _eigenVectors[num][com];
};
std::vector<std::complex<double> > &getEigenVector(int num)
{
return _eigenVectors[num];
}
void normalize_mode(std::vector<int> modeView, double scale = 1.);
void clear()
{
_eigenValues.clear();
_eigenVectors.clear();
};
};
#else
#include "linearSystemPETSc.h"
class eigenSolver {
private:
std::vector<std::complex<double> > _dummy;
public:
eigenSolver(dofManager<double> *manager, std::string A, std::string B = "",
bool hermitian = false)
{
}
eigenSolver(linearSystemPETSc<double> *A, linearSystemPETSc<double> *B = NULL,
bool hermitian = false)
{
}
bool solve(int = 0, std::string = "", std::string = "", double = 0, int = 0)
{
Msg::Error("Eigen solver requires SLEPc");
return false;
}
int getNumEigenValues() { return 0; }
int getNumberEigenvectors() { return 0; }
std::complex<double> getEigenValue(int num) { return 0.; }
std::complex<double> getEigenVectorComp(int num, int com) { return 0.; }
std::vector<std::complex<double> > &getEigenVector(int num) { return _dummy; }
void normalize_mode(std::vector<int> modeView, double scale = 1.) {}
void clear() {}
};
#endif
#endif
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