sparse-chol.h

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// Copyright (C) 1998-2025 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"
 
OCTAVE_BEGIN_NAMESPACE(octave)
 
OCTAVE_BEGIN_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 ();
 
  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 () = default;
 
  sparse_chol<chol_type>&
  operator = (const sparse_chol<chol_type>& a) = default;
 
  chol_type L () const;
 
  chol_type R () const { return L ().hermitian (); }
 
  octave_idx_type P () const;
 
  RowVector perm () const;
 
  SparseMatrix Q () const;
 
  bool is_positive_definite () const;
 
  double rcond () const;
 
  chol_type inverse () 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);
 
OCTAVE_END_NAMESPACE(math)
OCTAVE_END_NAMESPACE(octave)
 
#endif