ODE.h

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// Copyright (C) 1993-2025 The Octave Project Developers
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#if ! defined (octave_ODE_h)
#define octave_ODE_h 1
 
#include "octave-config.h"
 
#include "ODEFunc.h"
#include "base-de.h"
#include "dMatrix.h"
 
class ODE : public base_diff_eqn, public ODEFunc
{
public:
 
  ODE ()
    : base_diff_eqn (), ODEFunc () { }
 
  ODE (const ColumnVector& s, double tm, const ODEFunc& f)
    : base_diff_eqn (s, tm), ODEFunc (f) { }
 
  ODE (const ODE& a)
    : base_diff_eqn (a), ODEFunc (a) { }
 
  ODE& operator = (const ODE& a)
  {
    if (this != &a)
      {
        base_diff_eqn::operator = (a);
        ODEFunc::operator = (a);
      }
    return *this;
  }
 
  virtual ~ODE () = default;
 
  // Derived classes must provide functions to actually do the
  // integration.
 
  // Return the vector of states at output time t.
  virtual ColumnVector do_integrate (double tt) = 0;
 
  // Return a matrix of states at each output time specified by t.
  // The rows of the result matrix should each correspond to a new
  // output time.
  virtual Matrix do_integrate (const ColumnVector& tt) = 0;
 
  virtual Matrix do_integrate (const ColumnVector& tt,
                               const ColumnVector& ttcrit) = 0;
 
  // Lots of ways to call the single function and optionally set and
  // get additional information.
 
  // Integrate to t from current point.
  virtual ColumnVector integrate (double tt)
  { return do_integrate (tt); }
 
  // Set new x0, t0 and integrate to t.
  virtual ColumnVector integrate (const ColumnVector& x0, double t0, double tt)
  {
    initialize (x0, t0);
    return do_integrate (tt);
  }
 
  // Integrate from current point and return output at all points
  // specified by t.
  virtual Matrix integrate (const ColumnVector& tt)
  { return do_integrate (tt); }
 
  // Set new x0, t0 and integrate to return output at all points
  // specified by t.
  virtual Matrix integrate (const ColumnVector& x0, double t0,
                            const ColumnVector& tt)
  {
    initialize (x0, t0);
    return do_integrate (tt);
  }
 
  // Integrate from current point and return output at all points
  // specified by t.
  virtual Matrix integrate (const ColumnVector& tt,
                            const ColumnVector& ttcrit)
  { return do_integrate (tt, ttcrit); }
 
  // Set new x0, t0 and integrate to return output at all points
  // specified by t.
  virtual Matrix integrate (const ColumnVector& x0, double t0,
                            const ColumnVector& tt,
                            const ColumnVector& ttcrit)
  {
    initialize (x0, t0);
    return do_integrate (tt, ttcrit);
  }
};
 
#endif