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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 "Quad.h"
#include "f77-fcn.h"
#include "lo-error.h"
#include "sun-utils.h"
static integrand_fcn user_fcn;
// XXX FIXME XXX -- would be nice to not have to have this global
// variable.
// Nonzero means an error occurred in the calculation of the integrand
// function, and the user wants us to quit.
int quad_integration_error = 0;
extern "C"
{
int F77_FCN (dqagp, DQAGP) (int (*)(double*, int&, double*),
const double&, const double&,
const int&, const double*,
const double&, const double&, double&,
double&, int&, int&, const int&,
const int&, int&, int*, double*);
int F77_FCN (dqagi, DQAGI) (int (*)(double*, int&, double*),
const double&, const int&,
const double&, const double&, double&,
double&, int&, int&, const int&,
const int&, int&, int*, double*);
}
static int
user_function (double *x, int& ierr, double *result)
{
#if defined (sun) && defined (__GNUC__)
double xx = access_double (x);
#else
double xx = *x;
#endif
quad_integration_error = 0;
double xresult = (*user_fcn) (xx);
#if defined (sun) && defined (__GNUC__)
assign_double (result, xresult);
#else
*result = xresult;
#endif
if (quad_integration_error)
ierr = -1;
return 0;
}
double
DefQuad::integrate (int& ier, int& neval, double& abserr)
{
int npts = singularities.capacity () + 2;
double *points = singularities.fortran_vec ();
double result = 0.0;
int leniw = 183*npts - 122;
Array<int> iwork (leniw);
int *piwork = iwork.fortran_vec ();
int lenw = 2*leniw - npts;
Array<double> work (lenw);
double *pwork = work.fortran_vec ();
user_fcn = f;
int last;
double abs_tol = absolute_tolerance ();
double rel_tol = relative_tolerance ();
F77_XFCN (dqagp, DQAGP, (user_function, lower_limit, upper_limit,
npts, points, abs_tol, rel_tol, result,
abserr, neval, ier, leniw, lenw, last,
piwork, pwork));
if (f77_exception_encountered)
(*current_liboctave_error_handler) ("unrecoverable error in dqagp");
return result;
}
double
IndefQuad::integrate (int& ier, int& neval, double& abserr)
{
double result = 0.0;
int leniw = 128;
Array<int> iwork (leniw);
int *piwork = iwork.fortran_vec ();
int lenw = 8*leniw;
Array<double> work (lenw);
double *pwork = work.fortran_vec ();
user_fcn = f;
int last;
int inf;
switch (type)
{
case bound_to_inf:
inf = 1;
break;
case neg_inf_to_bound:
inf = -1;
break;
case doubly_infinite:
inf = 2;
break;
default:
assert (0);
break;
}
double abs_tol = absolute_tolerance ();
double rel_tol = relative_tolerance ();
F77_XFCN (dqagi, DQAGI, (user_function, bound, inf, abs_tol, rel_tol,
result, abserr, neval, ier, leniw, lenw,
last, piwork, pwork));
if (f77_exception_encountered)
(*current_liboctave_error_handler) ("unrecoverable error in dqagi");
return result;
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/
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