home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Geek Gadgets 1
/
ADE-1.bin
/
ade-dist
/
octave-1.1.1p1-src.tgz
/
tar.out
/
fsf
/
octave
/
src
/
f-dassl.cc
< prev
next >
Wrap
C/C++ Source or Header
|
1996-09-28
|
7KB
|
338 lines
// f-dassl.cc -*- C++ -*-
/*
Copyright (C) 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 <strstream.h>
#include "DAE.h"
#include "tree-const.h"
#include "variables.h"
#include "gripes.h"
#include "error.h"
#include "utils.h"
#include "pager.h"
#include "help.h"
#include "defun-dld.h"
// Global pointer for user defined function required by dassl.
static tree_fvc *dassl_fcn;
static ODE_options dassl_opts;
ColumnVector
dassl_user_function (const ColumnVector& x, const ColumnVector& xdot, double t)
{
ColumnVector retval;
int nstates = x.capacity ();
assert (nstates == xdot.capacity ());
Octave_object args;
args(2) = t;
if (nstates > 1)
{
Matrix m1 (nstates, 1);
Matrix m2 (nstates, 1);
for (int i = 0; i < nstates; i++)
{
m1 (i, 0) = x.elem (i);
m2 (i, 0) = xdot.elem (i);
}
tree_constant state (m1);
tree_constant deriv (m2);
args(1) = deriv;
args(0) = state;
}
else
{
double d1 = x.elem (0);
double d2 = xdot.elem (0);
tree_constant state (d1);
tree_constant deriv (d2);
args(1) = deriv;
args(0) = state;
}
if (dassl_fcn)
{
Octave_object tmp = dassl_fcn->eval (0, 1, args);
if (error_state)
{
gripe_user_supplied_eval ("dassl");
return retval;
}
if (tmp.length () > 0 && tmp(0).is_defined ())
{
retval = tmp(0).vector_value ();
if (error_state || retval.length () == 0)
gripe_user_supplied_eval ("dassl");
}
else
gripe_user_supplied_eval ("dassl");
}
return retval;
}
DEFUN_DLD_BUILTIN ("dassl", Fdassl, Sdassl, 5, 2,
"dassl (\"function_name\", x_0, xdot_0, t_out)\n\
dassl (F, X_0, XDOT_0, T_OUT, T_CRIT)\n\
\n\
The first argument is the name of the function to call to\n\
compute the vector of residuals. It must have the form\n\
\n\
res = f (x, xdot, t)\n\
\n\
where x, xdot, and res are vectors, and t is a scalar.")
{
Octave_object retval;
int nargin = args.length ();
if (nargin < 4 || nargin > 5)
{
print_usage ("dassl");
return retval;
}
dassl_fcn = is_valid_function (args(0), "dassl", 1);
if (! dassl_fcn || takes_correct_nargs (dassl_fcn, 3, "dassl", 1) != 1)
return retval;
ColumnVector state = args(1).vector_value ();
if (error_state)
{
error ("dassl: expecting state vector as second argument");
return retval;
}
ColumnVector deriv = args(2).vector_value ();
if (error_state)
{
error ("dassl: expecting derivative vector as third argument");
return retval;
}
ColumnVector out_times = args(3).vector_value ();
if (error_state)
{
error ("dassl: expecting output time vector as fourth argument");
return retval;
}
ColumnVector crit_times;
int crit_times_set = 0;
if (nargin > 4)
{
crit_times = args(4).vector_value ();
if (error_state)
{
error ("dassl: expecting critical time vector as fifth argument");
return retval;
}
crit_times_set = 1;
}
if (state.capacity () != deriv.capacity ())
{
error ("dassl: x and xdot must have the same size");
return retval;
}
double tzero = out_times.elem (0);
DAEFunc func (dassl_user_function);
DAE dae (state, deriv, tzero, func);
dae.copy (dassl_opts);
Matrix output;
Matrix deriv_output;
if (crit_times_set)
output = dae.integrate (out_times, deriv_output, crit_times);
else
output = dae.integrate (out_times, deriv_output);
retval.resize (2);
retval(0) = output;
retval(1) = deriv_output;
return retval;
}
typedef void (ODE_options::*d_set_opt_mf) (double);
typedef double (ODE_options::*d_get_opt_mf) (void);
#define MAX_TOKENS 3
struct DAE_OPTIONS
{
const char *keyword;
const char *kw_tok[MAX_TOKENS + 1];
int min_len[MAX_TOKENS + 1];
int min_toks_to_match;
d_set_opt_mf d_set_fcn;
d_get_opt_mf d_get_fcn;
};
static DAE_OPTIONS dassl_option_table [] =
{
{ "absolute tolerance",
{ "absolute", "tolerance", 0, 0, },
{ 1, 0, 0, 0, }, 1,
ODE_options::set_absolute_tolerance,
ODE_options::absolute_tolerance, },
{ "initial step size",
{ "initial", "step", "size", 0, },
{ 1, 0, 0, 0, }, 1,
ODE_options::set_initial_step_size,
ODE_options::initial_step_size, },
{ "maximum step size",
{ "maximum", "step", "size", 0, },
{ 2, 0, 0, 0, }, 1,
ODE_options::set_maximum_step_size,
ODE_options::maximum_step_size, },
{ "relative tolerance",
{ "relative", "tolerance", 0, 0, },
{ 1, 0, 0, 0, }, 1,
ODE_options::set_relative_tolerance,
ODE_options::relative_tolerance, },
{ 0,
{ 0, 0, 0, 0, },
{ 0, 0, 0, 0, }, 0,
0, 0, },
};
static void
print_dassl_option_list (void)
{
ostrstream output_buf;
print_usage ("dassl_options", 1);
output_buf << "\n"
<< "Options for dassl include:\n\n"
<< " keyword value\n"
<< " ------- -----\n\n";
DAE_OPTIONS *list = dassl_option_table;
const char *keyword;
while ((keyword = list->keyword) != 0)
{
output_buf.form (" %-40s ", keyword);
double val = (dassl_opts.*list->d_get_fcn) ();
if (val < 0.0)
output_buf << "computed automatically";
else
output_buf << val;
output_buf << "\n";
list++;
}
output_buf << "\n" << ends;
maybe_page_output (output_buf);
}
static void
do_dassl_option (char *keyword, double val)
{
DAE_OPTIONS *list = dassl_option_table;
while (list->keyword != 0)
{
if (keyword_almost_match (list->kw_tok, list->min_len, keyword,
list->min_toks_to_match, MAX_TOKENS))
{
(dassl_opts.*list->d_set_fcn) (val);
return;
}
list++;
}
warning ("dassl_options: no match for `%s'", keyword);
}
DEFUN_DLD_BUILTIN ("dassl_options", Fdassl_options, Sdassl_options, -1, 1,
"dassl_options (KEYWORD, VALUE)\n\
\n\
Set or show options for dassl. Keywords may be abbreviated\n\
to the shortest match.")
{
Octave_object retval;
int nargin = args.length ();
if (nargin == 0)
{
print_dassl_option_list ();
return retval;
}
else if (nargin == 2)
{
char *keyword = args(0).string_value ();
if (! error_state)
{
double val = args(1).double_value ();
if (! error_state)
{
do_dassl_option (keyword, val);
return retval;
}
}
}
print_usage ("dassl_options");
return retval;
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; page-delimiter: "^/\\*" ***
;;; End: ***
*/