00001 /* 00002 ------------------------------------------------------------------- 00003 00004 Copyright (C) 2006, 2007, 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 template<class param_t, class func_t> class gsl_inte_qagi : 00037 public gsl_inte_transform<param_t,func_t> { 00038 00039 public: 00040 00041 /** \brief Integrate function \c func from \f$ -\infty \f$ to 00042 \f$ \infty \f$ 00043 00044 The values given in \c a and \c b are ignored 00045 */ 00046 virtual double integ(func_t &func, double a, double b, param_t &pa) { 00047 double res, err; 00048 integ_err(func,a,b,pa,res,err); 00049 this->interror=err; 00050 return res; 00051 } 00052 00053 /** \brief Integrate function \c func from \f$ \infty \f$ 00054 to \f$ \infty \f$ giving result \c res and error \c err 00055 00056 The values \c a and \c b are ignored 00057 */ 00058 virtual int integ_err(func_t &func, double a, double b, 00059 param_t &pa, double &res, double &err2) { 00060 00061 double fv1[8], fv2[8]; 00062 00063 int status=qags(func,8,o2scl_inte_qag_coeffs::qk15_xgk, 00064 o2scl_inte_qag_coeffs::qk15_wg, 00065 o2scl_inte_qag_coeffs::qk15_wgk, 00066 fv1,fv2,0.0,1.0,this->tolx,this->tolf, 00067 this->wkspace,&res,&err2,pa); 00068 return status; 00069 00070 } 00071 00072 #ifndef DOXYGEN_INTERNAL 00073 00074 protected: 00075 00076 /// Tranformation to \f$ t \in (0,1] \f$ 00077 virtual double transform(func_t &func, double t, param_t &pa) { 00078 double x=(1-t)/t, y1, y2; 00079 func(x,y1,pa); 00080 func(-x,y2,pa); 00081 return (y1+y2)/t/t; 00082 } 00083 00084 #endif 00085 00086 }; 00087 00088 #ifndef DOXYGENP 00089 } 00090 #endif 00091 00092 #endif
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