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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: ***
- */
-