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Object-oriented Scientific Computing Library: Version 0.910
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00001 /* 00002 ------------------------------------------------------------------- 00003 00004 Copyright (C) 2006-2012, Jerry Gagelman 00005 and Andrew W. Steiner 00006 00007 This file is part of O2scl. 00008 00009 O2scl is free software; you can redistribute it and/or modify 00010 it under the terms of the GNU General Public License as published by 00011 the Free Software Foundation; either version 3 of the License, or 00012 (at your option) any later version. 00013 00014 O2scl is distributed in the hope that it will be useful, 00015 but WITHOUT ANY WARRANTY; without even the implied warranty of 00016 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00017 GNU General Public License for more details. 00018 00019 You should have received a copy of the GNU General Public License 00020 along with O2scl. If not, see <http://www.gnu.org/licenses/>. 00021 00022 ------------------------------------------------------------------- 00023 */ 00024 #ifndef O2SCL_GSL_INTE_QAGI_H 00025 #define O2SCL_GSL_INTE_QAGI_H 00026 00027 #include <o2scl/inte.h> 00028 #include <o2scl/gsl_inte_qags.h> 00029 00030 #ifndef DOXYGENP 00031 namespace o2scl { 00032 #endif 00033 00034 /** \brief Integrate a function over the interval \f$ 00035 (-\infty,\infty) \f$ (GSL) 00036 00037 See \ref gslinte_subsect in the User's guide for general 00038 information about the GSL integration classes. 00039 */ 00040 template<class func_t=funct > class gsl_inte_qagi : 00041 public gsl_inte_transform<func_t> { 00042 00043 public: 00044 00045 /** \brief Integrate function \c func from \f$ \infty \f$ 00046 to \f$ \infty \f$ giving result \c res and error \c err 00047 00048 The values \c a and \c b are ignored 00049 */ 00050 virtual int integ_err(func_t &func, double a, double b, 00051 double &res, double &err) { 00052 this->last_conv=0; 00053 return qags(func,0.0,1.0,this->tol_abs,this->tol_rel,&res,&err); 00054 } 00055 00056 #ifndef DOXYGEN_INTERNAL 00057 00058 protected: 00059 00060 /// Tranformation to \f$ t \in (0,1] \f$ 00061 virtual double transform(double t, func_t &func) { 00062 double x=(1-t)/t, y1, y2; 00063 y1=func(x); 00064 y2=func(-x); 00065 return (y1+y2)/t/t; 00066 } 00067 00068 #endif 00069 00070 }; 00071 00072 #ifndef DOXYGENP 00073 } 00074 #endif 00075 00076 #endif
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