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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 (__GNUG__)
#pragma implementation
#endif
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <iostream.h>
#include "CollocWt.h"
#include "f77-fcn.h"
#include "lo-error.h"
extern "C"
{
int F77_FCN (jcobi, JCOBI) (int&, int&, int&, int&, double&,
double&, double*, double*, double*,
double*);
int F77_FCN (dfopr, DFOPR) (int&, int&, int&, int&, int&, int&,
double*, double*, double*, double*,
double*);
}
// Error handling.
void
CollocWt::error (const char* msg)
{
(*current_liboctave_error_handler) ("fatal CollocWt error: %s", msg);
}
CollocWt&
CollocWt::set_left (double val)
{
if (val >= rb)
{
error ("left bound greater than right bound");
return *this;
}
lb = val;
initialized = 0;
return *this;
}
CollocWt&
CollocWt::set_right (double val)
{
if (val <= lb)
{
error ("right bound less than left bound");
return *this;
}
rb = val;
initialized = 0;
return *this;
}
void
CollocWt::init (void)
{
// Check for possible errors.
double wid = rb - lb;
if (wid <= 0.0)
{
error ("width less than or equal to zero");
return;
}
int nt = n + inc_left + inc_right;
if (nt < 0)
{
error ("total number of collocation points less than zero");
return;
}
else if (nt == 0)
return;
Array<double> dif1 (nt);
double *pdif1 = dif1.fortran_vec ();
Array<double> dif2 (nt);
double *pdif2 = dif2.fortran_vec ();
Array<double> dif3 (nt);
double *pdif3 = dif3.fortran_vec ();
Array<double> vect (nt);
double *pvect = vect.fortran_vec ();
r.resize (nt);
q.resize (nt);
A.resize (nt, nt);
B.resize (nt, nt);
double *pr = r.fortran_vec ();
// Compute roots.
F77_FCN (jcobi, JCOBI) (nt, n, inc_left, inc_right, Alpha, Beta,
pdif1, pdif2, pdif3, pr);
int id;
// First derivative weights.
id = 1;
for (int i = 1; i <= nt; i++)
{
F77_FCN (dfopr, DFOPR) (nt, n, inc_left, inc_right, i, id, pdif1,
pdif2, pdif3, pr, pvect);
for (int j = 0; j < nt; j++)
A (i-1, j) = vect.elem (j);
}
// Second derivative weights.
id = 2;
for (int i = 1; i <= nt; i++)
{
F77_FCN (dfopr, DFOPR) (nt, n, inc_left, inc_right, i, id, pdif1,
pdif2, pdif3, pr, pvect);
for (int j = 0; j < nt; j++)
B (i-1, j) = vect.elem (j);
}
// Gaussian quadrature weights.
id = 3;
double *pq = q.fortran_vec ();
F77_FCN (dfopr, DFOPR) (nt, n, inc_left, inc_right, id, id, pdif1,
pdif2, pdif3, pr, pq);
initialized = 1;
}
ostream&
operator << (ostream& os, const CollocWt& a)
{
if (a.left_included ())
os << "left boundary is included\n";
else
os << "left boundary is not included\n";
if (a.right_included ())
os << "right boundary is included\n";
else
os << "right boundary is not included\n";
os << "\n";
os << a.Alpha << " " << a.Beta << "\n\n"
<< a.r << "\n\n"
<< a.q << "\n\n"
<< a.A << "\n"
<< a.B << "\n";
return os;
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/
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