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/*
Copyright (C) 1996, 1997 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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
*/
#if defined (__GNUG__) && defined (USE_PRAGMA_INTERFACE_IMPLEMENTATION)
#pragma implementation
#endif
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "NLEqn.h"
#include "dMatrix.h"
#include "f77-fcn.h"
#include "lo-error.h"
#include "quit.h"
typedef int (*hybrd1_fcn_ptr) (int*, double*, double*, int*);
typedef int (*hybrj1_fcn_ptr) (int*, double*, double*, double*, int*, int*);
extern "C"
{
F77_RET_T
F77_FUNC (hybrd1, HYBRD1) (hybrd1_fcn_ptr, const int&, double*,
double*, const double&, int&, double*,
const int&);
F77_RET_T
F77_FUNC (hybrj1, HYBRJ1) (hybrj1_fcn_ptr, const int&, double*,
double*, double*, const int&, const
double&, int&, double*, const int&);
}
static NLFunc::nonlinear_fcn user_fun;
static NLFunc::jacobian_fcn user_jac;
// error handling
void
NLEqn::error (const char* msg)
{
(*current_liboctave_error_handler) ("fatal NLEqn error: %s", msg);
}
// Other operations
int
hybrd1_fcn (int *n, double *x, double *fvec, int *iflag)
{
BEGIN_INTERRUPT_WITH_EXCEPTIONS;
int nn = *n;
ColumnVector tmp_f (nn);
ColumnVector tmp_x (nn);
for (int i = 0; i < nn; i++)
tmp_x.elem (i) = x[i];
tmp_f = (*user_fun) (tmp_x);
if (tmp_f.length () == 0)
*iflag = -1;
else
{
for (int i = 0; i < nn; i++)
fvec[i] = tmp_f.elem (i);
}
END_INTERRUPT_WITH_EXCEPTIONS;
return 0;
}
int
hybrj1_fcn (int *n, double *x, double *fvec, double *fjac,
int *ldfjac, int *iflag)
{
BEGIN_INTERRUPT_WITH_EXCEPTIONS;
int nn = *n;
ColumnVector tmp_x (nn);
for (int i = 0; i < nn; i++)
tmp_x.elem (i) = x[i];
int flag = *iflag;
if (flag == 1)
{
ColumnVector tmp_f (nn);
tmp_f = (*user_fun) (tmp_x);
if (tmp_f.length () == 0)
*iflag = -1;
else
{
for (int i = 0; i < nn; i++)
fvec[i] = tmp_f.elem (i);
}
}
else
{
Matrix tmp_fj (nn, nn);
tmp_fj = (*user_jac) (tmp_x);
if (tmp_fj.rows () == 0 || tmp_fj.columns () == 0)
*iflag = -1;
else
{
int ld = *ldfjac;
for (int j = 0; j < nn; j++)
for (int i = 0; i < nn; i++)
fjac[j*ld+i] = tmp_fj.elem (i, j);
}
}
END_INTERRUPT_WITH_EXCEPTIONS;
return 0;
}
ColumnVector
NLEqn::solve (int& info)
{
ColumnVector retval;
int n = x.capacity ();
if (n == 0)
{
error ("equation set not initialized");
return retval;
}
double tol = tolerance ();
retval = x;
double *px = retval.fortran_vec ();
user_fun = fun;
user_jac = jac;
if (jac)
{
Array<double> fvec (n);
double *pfvec = fvec.fortran_vec ();
int lwa = (n*(n+13))/2;
Array<double> wa (lwa);
double *pwa = wa.fortran_vec ();
Array<double> fjac (n*n);
double *pfjac = fjac.fortran_vec ();
F77_XFCN (hybrj1, HYBRJ1, (hybrj1_fcn, n, px, pfvec, pfjac, n,
tol, info, pwa, lwa));
solution_status = info;
if (f77_exception_encountered)
(*current_liboctave_error_handler) ("unrecoverable error in hybrj1");
}
else
{
Array<double> fvec (n);
double *pfvec = fvec.fortran_vec ();
int lwa = (n*(3*n+13))/2;
Array<double> wa (lwa);
double *pwa = wa.fortran_vec ();
F77_XFCN (hybrd1, HYBRD1, (hybrd1_fcn, n, px, pfvec, tol, info,
pwa, lwa));
solution_status = info;
if (f77_exception_encountered)
(*current_liboctave_error_handler) ("unrecoverable error in hybrd1");
}
return retval;
}
std::string
NLEqn::error_message (void) const
{
std::string retval;
std::string prefix;
int info = solution_status;
if (info < 0)
info = -info;
switch (info)
{
case 0:
retval = "improper input parameters";
break;
case 1:
retval = "solution converged within specified tolerance";
break;
case 2:
retval = "number of function calls exceeded limit";
break;
case 3:
retval = "no further improvement possible (tolerance may be too small)";
break;
case 4:
retval = "iteration is not making good progress";
break;
default:
retval = "unknown error state";
break;
}
if (solution_status < 0)
retval = std::string ("user requested termination: ") + retval;
return retval;
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/
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