monolish_generalized_eigen.hpp

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#pragma once
#include <omp.h>
#include <vector>
 
#include "./monolish_solver.hpp"
#include "monolish/common/monolish_common.hpp"
 
namespace monolish {
namespace generalized_eigen {
 
template <typename MATRIX, typename Float>
class LOBPCG : public solver::solver<MATRIX, Float> {
private:
  // TODO: support multiple lambda(eigenvalue)s
  [[nodiscard]] int monolish_LOBPCG(MATRIX &A, MATRIX &B, vector<Float> &lambda,
                                    matrix::Dense<Float> &x, int itype);
 
public:
  [[nodiscard]] int solve(MATRIX &A, MATRIX &B, vector<Float> &lambda,
                          matrix::Dense<Float> &x, int itype);
 
  void create_precond(MATRIX &A) {
    throw std::runtime_error("this precond. is not impl.");
  }
 
  void apply_precond(const vector<Float> &r, vector<Float> &z) {
    throw std::runtime_error("this precond. is not impl.");
  }
 
  [[nodiscard]] std::string name() const {
    return "monolish::generalized_eigen::LOBPCG";
  }
 
  [[nodiscard]] std::string solver_name() const { return "LOBPCG"; }
};
template <typename MATRIX, typename Float>
class DC : public solver::solver<MATRIX, Float> {
private:
  [[nodiscard]] int LAPACK_DC(MATRIX &A, MATRIX &B, vector<Float> &lambda,
                              int itype);
 
public:
  [[nodiscard]] int solve(MATRIX &A, MATRIX &B, vector<Float> &lambda,
                          int itype);
 
  void create_precond(MATRIX &A) {
    throw std::runtime_error("this precond. is not impl.");
  }
 
  void apply_precond(const vector<Float> &r, vector<Float> &z) {
    throw std::runtime_error("this precond. is not impl.");
  }
 
  [[nodiscard]] std::string name() const {
    return "monolish::generalized_eigen::DC";
  }
 
  [[nodiscard]] std::string solver_name() const { return "DC"; }
};
} // namespace generalized_eigen
} // namespace monolish