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/*
Copyright (C) 1996 John W. Eaton
This file is part of Octave.
Octave is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
Octave is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#if !defined (octave_base_de_h)
#define octave_base_de_h 1
#include "dColVector.h"
#include "dMatrix.h"
class
base_diff_eqn
{
public:
base_diff_eqn (void) : x (), t (0.0) { }
base_diff_eqn (const ColumnVector& xx, double tt) : x (xx), t (tt) { }
base_diff_eqn (const base_diff_eqn& a) : x (a.x), t (a.t) { }
virtual ~base_diff_eqn (void) { }
base_diff_eqn& operator = (const base_diff_eqn& a)
{
if (this != &a)
{
x = a.x;
t = a.t;
}
return *this;
}
// Derived classes must provide functions to actually do the
// integration.
// Return the vector of states at output time t.
virtual ColumnVector do_integrate (double t) = 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& t) = 0;
// There must also be a way for us to force the integration to
// restart.
virtual void force_restart (void) = 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 t)
{ return do_integrate (t); }
// Set new x0, t0 and integrate to t.
virtual ColumnVector integrate (const ColumnVector& x0, double t0, double t)
{
initialize (x0, t0);
return do_integrate (t);
}
// Integrate from current point and return output at all points
// specified by t.
virtual Matrix integrate (const ColumnVector t)
{ return do_integrate (t); }
// 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 t)
{
initialize (x0, t0);
return do_integrate (t);
}
virtual void initialize (const ColumnVector& x0, double t0)
{
x = x0;
t = t0;
force_restart ();
}
int size (void) const { return x.capacity (); }
ColumnVector state (void) const { return x; }
double time (void) const { return t; }
protected:
ColumnVector x;
double t;
};
#endif
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/
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