00001 /* 00002 ------------------------------------------------------------------- 00003 00004 Copyright (C) 2006, 2007, 2008, 2009, Andrew W. Steiner 00005 00006 This file is part of O2scl. 00007 00008 O2scl is free software; you can redistribute it and/or modify 00009 it under the terms of the GNU General Public License as published by 00010 the Free Software Foundation; either version 3 of the License, or 00011 (at your option) any later version. 00012 00013 O2scl is distributed in the hope that it will be useful, 00014 but WITHOUT ANY WARRANTY; without even the implied warranty of 00015 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00016 GNU General Public License for more details. 00017 00018 You should have received a copy of the GNU General Public License 00019 along with O2scl. If not, see <http://www.gnu.org/licenses/>. 00020 00021 ------------------------------------------------------------------- 00022 */ 00023 #ifndef O2SCL_GSL_INTE_QAGI_H 00024 #define O2SCL_GSL_INTE_QAGI_H 00025 00026 #include <o2scl/inte.h> 00027 #include <o2scl/gsl_inte_qags.h> 00028 00029 #ifndef DOXYGENP 00030 namespace o2scl { 00031 #endif 00032 00033 /** \brief Integrate a function from \f$ -\infty \f$ to \f$ \infty \f$ 00034 (GSL) 00035 00036 The number of subdivisions of the original interval which 00037 this class is allowed to make is dictated by the workspace 00038 size for the integration class, which can be set using 00039 \ref gsl_inte_table::set_wkspace() . 00040 00041 */ 00042 template<class param_t, class func_t=funct<param_t> > class gsl_inte_qagi : 00043 public gsl_inte_transform<param_t,func_t> { 00044 00045 public: 00046 00047 /** \brief Integrate function \c func from \f$ -\infty \f$ to 00048 \f$ \infty \f$ 00049 00050 The values given in \c a and \c b are ignored 00051 */ 00052 virtual double integ(func_t &func, double a, double b, param_t &pa) { 00053 double res, err; 00054 integ_err(func,a,b,pa,res,err); 00055 this->interror=err; 00056 return res; 00057 } 00058 00059 /** \brief Integrate function \c func from \f$ \infty \f$ 00060 to \f$ \infty \f$ giving result \c res and error \c err 00061 00062 The values \c a and \c b are ignored 00063 */ 00064 virtual int integ_err(func_t &func, double a, double b, 00065 param_t &pa, double &res, double &err2) { 00066 00067 double fv1[8], fv2[8]; 00068 00069 int status=qags(func,8,o2scl_inte_qag_coeffs::qk15_xgk, 00070 o2scl_inte_qag_coeffs::qk15_wg, 00071 o2scl_inte_qag_coeffs::qk15_wgk, 00072 fv1,fv2,0.0,1.0,this->tolx,this->tolf, 00073 this->wkspace,&res,&err2,pa); 00074 return status; 00075 00076 } 00077 00078 #ifndef DOXYGEN_INTERNAL 00079 00080 protected: 00081 00082 /// Tranformation to \f$ t \in (0,1] \f$ 00083 virtual double transform(func_t &func, double t, param_t &pa) { 00084 double x=(1-t)/t, y1, y2; 00085 func(x,y1,pa); 00086 func(-x,y2,pa); 00087 return (y1+y2)/t/t; 00088 } 00089 00090 #endif 00091 00092 }; 00093 00094 #ifndef DOXYGENP 00095 } 00096 #endif 00097 00098 #endif
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