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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_LSODE_h)
#define octave_LSODE_h 1
#if defined (__GNUG__)
#pragma interface
#endif
#if 0
class ostream;
#endif
#include <cfloat>
#include <cmath>
#include "ODE.h"
class
LSODE_options
{
public:
LSODE_options (void) { init (); }
LSODE_options (const LSODE_options& opt) { copy (opt); }
LSODE_options& operator = (const LSODE_options& opt)
{
if (this != &opt)
copy (opt);
return *this;
}
~LSODE_options (void) { }
void init (void)
{
double sqrt_eps = ::sqrt (DBL_EPSILON);
x_absolute_tolerance = sqrt_eps;
x_initial_step_size = -1.0;
x_maximum_step_size = -1.0;
x_minimum_step_size = 0.0;
x_relative_tolerance = sqrt_eps;
// This is consistent with earlier versions of Octave, and is
// much larger than the default of 500 specified in the LSODE
// sources.
x_step_limit = 100000;
}
void copy (const LSODE_options& opt)
{
x_absolute_tolerance = opt.x_absolute_tolerance;
x_initial_step_size = opt.x_initial_step_size;
x_maximum_step_size = opt.x_maximum_step_size;
x_minimum_step_size = opt.x_minimum_step_size;
x_relative_tolerance = opt.x_relative_tolerance;
x_step_limit = opt.x_step_limit;
}
void set_default_options (void) { init (); }
void set_absolute_tolerance (double val)
{ x_absolute_tolerance = (val > 0.0) ? val : ::sqrt (DBL_EPSILON); }
void set_initial_step_size (double val)
{ x_initial_step_size = (val >= 0.0) ? val : -1.0; }
void set_maximum_step_size (double val)
{ x_maximum_step_size = (val >= 0.0) ? val : -1.0; }
void set_minimum_step_size (double val)
{ x_minimum_step_size = (val >= 0.0) ? val : 0.0; }
void set_relative_tolerance (double val)
{ x_relative_tolerance = (val > 0.0) ? val : ::sqrt (DBL_EPSILON); }
void set_step_limit (int val)
{ x_step_limit = (val > 0) ? val : 0; }
double absolute_tolerance (void) { return x_absolute_tolerance; }
double initial_step_size (void) { return x_initial_step_size; }
double maximum_step_size (void) { return x_maximum_step_size; }
double minimum_step_size (void) { return x_minimum_step_size; }
double relative_tolerance (void) { return x_relative_tolerance; }
int step_limit (void) { return x_step_limit; }
private:
double x_absolute_tolerance;
double x_initial_step_size;
double x_maximum_step_size;
double x_minimum_step_size;
double x_relative_tolerance;
int x_step_limit;
};
class
LSODE : public ODE, public LSODE_options
{
public:
LSODE (void);
LSODE (int n);
LSODE (const ColumnVector& state, double time, const ODEFunc& f);
~LSODE (void) { }
void force_restart (void);
void set_stop_time (double t);
void clear_stop_time (void);
ColumnVector do_integrate (double t);
Matrix do_integrate (const ColumnVector& tout);
#if 0
void integrate (int nsteps, double tstep, ostream& s);
#endif
Matrix integrate (const ColumnVector& tout)
{ return do_integrate (tout); }
Matrix integrate (const ColumnVector& tout, const ColumnVector& tcrit);
private:
double stop_time;
int stop_time_set;
int n;
int integration_error;
int restart;
int method_flag;
Array<int> iwork;
Array<double> rwork;
int istate;
int itol;
int itask;
int iopt;
int liw;
int lrw;
int sanity_checked;
friend int lsode_f (int *neq, double *t, double *y, double *ydot);
friend int lsode_j (int *neq, double *t, double *y, int *ml, int *mu,
double *pd, int *nrowpd);
};
#endif
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/
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