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DAE.cc
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1996-09-28
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// DAE.cc -*- C++ -*-
/*
Copyright (C) 1992, 1993, 1994, 1995 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, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "DAE.h"
#include "f77-uscore.h"
#include "lo-error.h"
extern "C"
{
int F77_FCN (ddassl) (int (*)(double*, double*, double*, double*,
int*, double*, int*),
const int*, double*, double*, double*,
double*, const int*, const double*,
const double*, int*, double*, const int*,
int*, const int*, const double*, const int*,
int (*)(double*, double*, double*, double*,
double*, double*, int*));
}
static DAEFunc::DAERHSFunc user_fun;
static DAEFunc::DAEJacFunc user_jac;
static int nn;
DAE::DAE (void)
{
n = 0;
t = 0.0;
stop_time_set = 0;
stop_time = 0.0;
integration_error = 0;
restart = 1;
DAEFunc::set_function (0);
DAEFunc::set_jacobian_function (0);
liw = 0;
lrw = 0;
info = new int [15];
iwork = (int *) 0;
rwork = (double *) 0;
for (int i = 0; i < 15; i++)
info [i] = 0;
}
DAE::DAE (int size)
{
n = size;
t = 0.0;
stop_time_set = 0;
stop_time = 0.0;
integration_error = 0;
restart = 1;
DAEFunc::set_function (0);
DAEFunc::set_jacobian_function (0);
liw = 20 + n;
lrw = 40 + 9*n + n*n;
info = new int [15];
iwork = new int [liw];
rwork = new double [lrw];
for (int i = 0; i < 15; i++)
info [i] = 0;
}
DAE::DAE (const Vector& state, double time, DAEFunc& f)
{
n = state.capacity ();
t = time;
x = state;
xdot.resize (n, 0.0);
stop_time_set = 0;
stop_time = 0.0;
integration_error = 0;
restart = 1;
DAEFunc::set_function (f.function ());
DAEFunc::set_jacobian_function (f.jacobian_function ());
liw = 20 + n;
lrw = 40 + 9*n + n*n;
info = new int [15];
iwork = new int [liw];
rwork = new double [lrw];
for (int i = 0; i < 15; i++)
info [i] = 0;
}
DAE::DAE (const Vector& state, const Vector& deriv, double time, DAEFunc& f)
{
if (deriv.capacity () != state.capacity ())
{
(*current_liboctave_error_handler)
("x, xdot size mismatch in DAE constructor");
n = 0;
t = 0.0;
return;
}
n = state.capacity ();
t = time;
xdot = deriv;
x = state;
stop_time_set = 0;
stop_time = 0.0;
DAEFunc::set_function (f.function ());
DAEFunc::set_jacobian_function (f.jacobian_function ());
liw = 20 + n;
lrw = 40 + 9*n + n*n;
info = new int [15];
iwork = new int [liw];
rwork = new double [lrw];
for (int i = 0; i < 15; i++)
info [i] = 0;
}
DAE::~DAE (void)
{
delete info;
delete rwork;
delete iwork;
}
Vector
DAE::deriv (void)
{
return xdot;
}
void
DAE::initialize (const Vector& state, double time)
{
integration_error = 0;
restart = 1;
x = state;
int nx = x.capacity ();
xdot.resize (nx, 0.0);
t = time;
}
void
DAE::initialize (const Vector& state, const Vector& deriv, double time)
{
integration_error = 0;
restart = 1;
xdot = deriv;
x = state;
t = time;
}
int
ddassl_f (double *time, double *state, double *deriv, double *delta,
int *ires, double *rpar, int *ipar)
{
Vector tmp_deriv (nn);
Vector tmp_state (nn);
Vector tmp_delta (nn);
for (int i = 0; i < nn; i++)
{
tmp_deriv.elem (i) = deriv [i];
tmp_state.elem (i) = state [i];
}
tmp_delta = user_fun (tmp_state, tmp_deriv, *time);
if (tmp_delta.length () == 0)
*ires = -2;
else
{
for (i = 0; i < nn; i++)
delta [i] = tmp_delta.elem (i);
}
return 0;
}
int
ddassl_j (double *time, double *state, double *deriv, double *pd,
double *cj, double *rpar, int *ipar)
{
Vector tmp_state (nn);
Vector tmp_deriv (nn);
// XXX FIXME XXX
Matrix tmp_dfdxdot (nn, nn);
Matrix tmp_dfdx (nn, nn);
DAEFunc::DAEJac tmp_jac;
tmp_jac.dfdxdot = &tmp_dfdxdot;
tmp_jac.dfdx = &tmp_dfdx;
tmp_jac = user_jac (tmp_state, tmp_deriv, *time);
// Fix up the matrix of partial derivatives for dassl.
tmp_dfdx = tmp_dfdx + (tmp_dfdxdot * (*cj));
for (int j = 0; j < nn; j++)
for (int i = 0; i < nn; i++)
pd [nn * j + i] = tmp_dfdx.elem (i, j);
return 0;
}
Vector
DAE::integrate (double tout)
{
integration_error = 0;
if (DAEFunc::jacobian_function ())
iwork [4] = 1;
else
iwork [4] = 0;
double *px = x.fortran_vec ();
double *pxdot = xdot.fortran_vec ();
nn = n;
user_fun = DAEFunc::fun;
user_jac = DAEFunc::jac;
if (stop_time_set)
{
info [3] = 1;
rwork [0] = stop_time;
}
else
info [3] = 0;
double abs_tol = absolute_tolerance ();
double rel_tol = relative_tolerance ();
if (initial_step_size () >= 0.0)
{
rwork[2] = initial_step_size ();
info[7] = 1;
}
else
info[7] = 0;
if (maximum_step_size () >= 0.0)
{
rwork[2] = maximum_step_size ();
info[6] = 1;
}
else
info[6] = 0;
double dummy;
int idummy;
if (restart)
{
restart = 0;
info[0] = 0;
}
// again:
F77_FCN (ddassl) (ddassl_f, &n, &t, px, pxdot, &tout, info,
&rel_tol, &abs_tol, &idid, rwork, &lrw, iwork,
&liw, &dummy, &idummy, ddassl_j);
switch (idid)
{
case 1: // A step was successfully taken in the
// intermediate-output mode. The code has not yet reached
// TOUT.
break;
case 2: // The integration to TSTOP was successfully completed
// (T=TSTOP) by stepping exactly to TSTOP.
break;
case 3: // The integration to TOUT was successfully completed
// (T=TOUT) by stepping past TOUT. Y(*) is obtained by
// interpolation. YPRIME(*) is obtained by interpolation.
break;
case -1: // A large amount of work has been expended. (About 500 steps).
case -2: // The error tolerances are too stringent.
case -3: // The local error test cannot be satisfied because you
// specified a zero component in ATOL and the
// corresponding computed solution component is zero.
// Thus, a pure relative error test is impossible for
// this component.
case -6: // DDASSL had repeated error test failures on the last
// attempted step.
case -7: // The corrector could not converge.
case -8: // The matrix of partial derivatives is singular.
case -9: // The corrector could not converge. There were repeated
// error test failures in this step.
case -10: // The corrector could not converge because IRES was
// equal to minus one.
case -11: // IRES equal to -2 was encountered and control is being
// returned to the calling program.
case -12: // DDASSL failed to compute the initial YPRIME.
case -33: // The code has encountered trouble from which it cannot
// recover. A message is printed explaining the trouble
// and control is returned to the calling program. For
// example, this occurs when invalid input is detected.
default:
integration_error = 1;
break;
}
t = tout;
return x;
}
Matrix
DAE::integrate (const Vector& tout, Matrix& xdot_out)
{
Matrix retval;
int n_out = tout.capacity ();
if (n_out > 0 && n > 0)
{
retval.resize (n_out, n);
xdot_out.resize (n_out, n);
for (int i = 0; i < n; i++)
{
retval.elem (0, i) = x.elem (i);
xdot_out.elem (0, i) = xdot.elem (i);
}
for (int j = 1; j < n_out; j++)
{
ColumnVector x_next = integrate (tout.elem (j));
if (integration_error)
return retval;
for (i = 0; i < n; i++)
{
retval.elem (j, i) = x_next.elem (i);
xdot_out.elem (j, i) = xdot.elem (i);
}
}
}
return retval;
}
Matrix
DAE::integrate (const Vector& tout, Matrix& xdot_out, const Vector& tcrit)
{
Matrix retval;
int n_out = tout.capacity ();
if (n_out > 0 && n > 0)
{
retval.resize (n_out, n);
xdot_out.resize (n_out, n);
for (int i = 0; i < n; i++)
{
retval.elem (0, i) = x.elem (i);
xdot_out.elem (0, i) = xdot.elem (i);
}
int n_crit = tcrit.capacity ();
if (n_crit > 0)
{
int i_crit = 0;
int i_out = 1;
double next_crit = tcrit.elem (0);
double next_out;
while (i_out < n_out)
{
int do_restart = 0;
next_out = tout.elem (i_out);
if (i_crit < n_crit)
next_crit = tcrit.elem (i_crit);
int save_output;
double t_out;
if (next_crit == next_out)
{
set_stop_time (next_crit);
t_out = next_out;
save_output = 1;
i_out++;
i_crit++;
do_restart = 1;
}
else if (next_crit < next_out)
{
if (i_crit < n_crit)
{
set_stop_time (next_crit);
t_out = next_crit;
save_output = 0;
i_crit++;
do_restart = 1;
}
else
{
clear_stop_time ();
t_out = next_out;
save_output = 1;
i_out++;
}
}
else
{
set_stop_time (next_crit);
t_out = next_out;
save_output = 1;
i_out++;
}
ColumnVector x_next = integrate (t_out);
if (integration_error)
return retval;
if (save_output)
{
for (i = 0; i < n; i++)
{
retval.elem (i_out-1, i) = x_next.elem (i);
xdot_out.elem (i_out-1, i) = xdot.elem (i);
}
}
if (do_restart)
force_restart ();
}
}
else
{
retval = integrate (tout, xdot_out);
if (integration_error)
return retval;
}
}
return retval;
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; page-delimiter: "^/\\*" ***
;;; End: ***
*/