sparse-chol.h

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// Copyright (C) 1998-2022 The Octave Project Developers
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#if ! defined (octave_sparse_chol_h)
#define octave_sparse_chol_h 1
 
#include "octave-config.h"
 
#include <memory>
 
#include "mx-fwd.h"
 
#include "CSparse.h"
 
namespace octave
{
  namespace math
  {
    // If the sparse matrix classes become templated on the element type
    // (i.e., sparse_matrix<double>), then it might be best to make the
    // template parameter of this class also be the element type instead
    // of the matrix type.
 
    template <typename chol_type>
    class
    OCTAVE_API
    sparse_chol
    {
    public:
 
      sparse_chol (void);
 
      sparse_chol (const chol_type& a, bool natural, bool force);
 
      sparse_chol (const chol_type& a, octave_idx_type& info,
                   bool natural, bool force);
 
      sparse_chol (const chol_type& a, octave_idx_type& info, bool natural);
 
      sparse_chol (const chol_type& a, octave_idx_type& info);
 
      sparse_chol (const sparse_chol<chol_type>& a) = default;
 
      virtual ~sparse_chol (void) = default;
 
      sparse_chol<chol_type>&
      operator = (const sparse_chol<chol_type>& a) = default;
 
      chol_type L (void) const;
 
      chol_type R (void) const { return L ().hermitian (); }
 
      octave_idx_type P (void) const;
 
      RowVector perm (void) const;
 
      SparseMatrix Q (void) const;
 
      bool is_positive_definite (void) const;
 
      double rcond (void) const;
 
      chol_type inverse (void) const;
 
    protected:
 
      typedef typename chol_type::element_type chol_elt;
 
      class sparse_chol_rep;
 
    private:
 
      std::shared_ptr<sparse_chol_rep> m_rep;
    };
 
    template <typename chol_type>
    OCTAVE_API
    chol_type
    chol2inv (const chol_type& r);
  }
}
 
#endif