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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 (octave_Quad_h)
- #define octave_Quad_h 1
-
- #if defined (__GNUG__)
- #pragma interface
- #endif
-
- #include <cfloat>
- #include <cmath>
-
- #include "dColVector.h"
-
- #if !defined (octave_Quad_typedefs)
- #define octave_Quad_typedefs 1
-
- typedef double (*integrand_fcn) (double x);
-
- #endif
-
- // 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.
- extern int quad_integration_error;
-
- class
- Quad_options
- {
- public:
-
- Quad_options (void) { init (); }
-
- // XXX FIXME XXX -- check for invalid values?
- Quad_options (double abs, double rel)
- : x_absolute_tolerance (abs), x_relative_tolerance (rel) { }
-
- Quad_options (const Quad_options& opt)
- : x_absolute_tolerance (opt.x_absolute_tolerance),
- x_relative_tolerance (opt.x_relative_tolerance) { }
-
- Quad_options& operator = (const Quad_options& opt)
- {
- if (this != &opt)
- set_options (opt);
-
- return *this;
- }
-
- ~Quad_options (void) { }
-
- void init (void)
- {
- double sqrt_eps = ::sqrt (DBL_EPSILON);
-
- x_absolute_tolerance = sqrt_eps;
- x_relative_tolerance = sqrt_eps;
- }
-
- void set_default_options (void) { init (); }
-
- void set_options (const Quad_options& opt)
- {
- x_absolute_tolerance = opt.x_absolute_tolerance;
- x_relative_tolerance = opt.x_relative_tolerance;
- }
-
- // XXX FIXME XXX -- check for invalid values?
- void set_absolute_tolerance (double val) { x_absolute_tolerance = val; }
- void set_relative_tolerance (double val) { x_relative_tolerance = val; }
-
- double absolute_tolerance (void) { return x_absolute_tolerance; }
- double relative_tolerance (void) { return x_relative_tolerance; }
-
- private:
-
- double x_absolute_tolerance;
- double x_relative_tolerance;
- };
-
- class
- Quad : public Quad_options
- {
- public:
-
- Quad (integrand_fcn fcn)
- : Quad_options (), f (fcn) { }
-
- Quad (integrand_fcn fcn, double abs, double rel)
- : Quad_options (abs, rel), f (fcn) { }
-
- virtual ~Quad (void) { }
-
- virtual double integrate (void)
- {
- int ier, neval;
- double abserr;
- return integrate (ier, neval, abserr);
- }
-
- virtual double integrate (int& ier)
- {
- int neval;
- double abserr;
- return integrate (ier, neval, abserr);
- }
-
- virtual double integrate (int& ier, int& neval)
- {
- double abserr;
- return integrate (ier, neval, abserr);
- }
-
- virtual double integrate (int& ier, int& neval, double& abserr) = 0;
-
- protected:
-
- integrand_fcn f;
- };
-
- class
- DefQuad : public Quad
- {
- public:
-
- DefQuad (integrand_fcn fcn)
- : Quad (fcn), lower_limit (0.0), upper_limit (1.0), singularities () { }
-
- DefQuad (integrand_fcn fcn, double ll, double ul)
- : Quad (fcn), lower_limit (ll), upper_limit (ul), singularities () { }
-
- DefQuad (integrand_fcn fcn, double ll, double ul, double abs,
- double rel)
- : Quad (fcn, abs, rel), lower_limit (ll), upper_limit (ul),
- singularities () { }
-
- DefQuad (integrand_fcn fcn, double ll, double ul,
- const ColumnVector& sing)
- : Quad (fcn), lower_limit (ll), upper_limit (ul),
- singularities (sing) { }
-
- DefQuad (integrand_fcn fcn, const ColumnVector& sing, double abs,
- double rel)
- : Quad (fcn, abs, rel), lower_limit (0.0), upper_limit (1.0),
- singularities (sing) { }
-
- DefQuad (integrand_fcn fcn, const ColumnVector& sing)
- : Quad (fcn), lower_limit (0.0), upper_limit (1.0),
- singularities (sing) { }
-
- DefQuad (integrand_fcn fcn, double ll, double ul, const ColumnVector& sing,
- double abs, double rel)
- : Quad (fcn, abs, rel), lower_limit (ll), upper_limit (ul),
- singularities (sing) { }
-
- ~DefQuad (void) { }
-
- double integrate (int& ier, int& neval, double& abserr);
-
- private:
-
- double lower_limit;
- double upper_limit;
-
- ColumnVector singularities;
- };
-
- class
- IndefQuad : public Quad
- {
- public:
-
- enum IntegralType { bound_to_inf, neg_inf_to_bound, doubly_infinite };
-
- IndefQuad (integrand_fcn fcn)
- : Quad (fcn), bound (0.0), type (bound_to_inf) { }
-
- IndefQuad (integrand_fcn fcn, double b, IntegralType t)
- : Quad (fcn), bound (b), type (t) { }
-
- IndefQuad (integrand_fcn fcn, double b, IntegralType t, double abs,
- double rel)
- : Quad (fcn, abs, rel), bound (b), type (t) { }
-
- IndefQuad (integrand_fcn fcn, double abs, double rel)
- : Quad (fcn, abs, rel), bound (0.0), type (bound_to_inf) { }
-
- ~IndefQuad (void) { }
-
- double integrate (int& ier, int& neval, double& abserr);
-
- private:
-
- double bound;
- IntegralType type;
- int integration_error;
- };
-
- #endif
-
- /*
- ;;; Local Variables: ***
- ;;; mode: C++ ***
- ;;; End: ***
- */
-