base-dae.h

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////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2002-2025 The Octave Project Developers
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// See the file COPYRIGHT.md in the top-level directory of this
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// This file is part of Octave.
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////////////////////////////////////////////////////////////////////////
 
#if ! defined (octave_base_dae_h)
#define octave_base_dae_h 1
 
#include "octave-config.h"
 
#include "base-de.h"
 
class base_diff_alg_eqn : public base_diff_eqn
{
public:
 
  base_diff_alg_eqn ()
    : base_diff_eqn (), m_xdot () { }
 
  base_diff_alg_eqn (const ColumnVector& xx, double tt)
    : base_diff_eqn (xx, tt), m_xdot (xx.numel (), 0.0) { }
 
  base_diff_alg_eqn (const ColumnVector& xx, const ColumnVector& xxdot,
                     double tt)
    : base_diff_eqn (xx, tt), m_xdot (xxdot) { }
 
  base_diff_alg_eqn (const base_diff_alg_eqn& a)
    : base_diff_eqn (a), m_xdot (a.m_xdot) { }
 
  virtual ~base_diff_alg_eqn () = default;
 
  base_diff_alg_eqn& operator = (const base_diff_alg_eqn& a)
  {
    if (this != &a)
      {
        base_diff_eqn::operator = (a);
        m_xdot = a.m_xdot;
      }
    return *this;
  }
 
  void initialize (const ColumnVector& x0, double t0)
  {
    base_diff_eqn::initialize (x0, t0);
    m_xdot = ColumnVector (x0.numel (), 0.0);
  }
 
  void initialize (const ColumnVector& x0, const ColumnVector& xdot0,
                   double t0)
  {
    base_diff_eqn::initialize (x0, t0);
    m_xdot = xdot0;
  }
 
  ColumnVector state_derivative () { return m_xdot; }
 
protected:
 
  ColumnVector m_xdot;
};
 
#endif