00001 /* 00002 ------------------------------------------------------------------- 00003 00004 Copyright (C) 2006, 2007, 2008, 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_QAGIL_H 00024 #define O2SCL_GSL_INTE_QAGIL_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 00034 \f$ \mathrm{b} \f$ (GSL) 00035 */ 00036 template<class param_t, class func_t=funct<param_t> > class gsl_inte_qagil : 00037 public gsl_inte_transform<param_t,func_t> { 00038 00039 #ifndef DOXYGEN_INTERNAL 00040 00041 protected: 00042 00043 /// Store the upper limit 00044 double lb; 00045 00046 #endif 00047 00048 public: 00049 00050 /** 00051 \brief Integrate function \c func from \f$ -\infty \f$ to \c b. 00052 00053 The value given in \c a is ignored. 00054 */ 00055 virtual double integ(func_t &func, double a, double b, param_t &pa) { 00056 double res, err; 00057 integ_err(func,a,b,pa,res,err); 00058 this->interror=err; 00059 return res; 00060 } 00061 00062 /** 00063 \brief Integrate function \c func from \f$ -\infty \f$ to \c b 00064 and place the result in \c res and the error in \c err2 00065 00066 The value given in \c a is ignored. 00067 */ 00068 virtual int integ_err(func_t &func, double a, double b, 00069 param_t &pa, double &res, double &err2) { 00070 00071 lb=b; 00072 00073 double fv1[8], fv2[8]; 00074 00075 int status=qags(func,8,o2scl_inte_qag_coeffs::qk15_xgk, 00076 o2scl_inte_qag_coeffs::qk15_wg, 00077 o2scl_inte_qag_coeffs::qk15_wgk, 00078 fv1,fv2,0.0,1.0,this->tolx,this->tolf, 00079 this->wkspace,&res,&err2,pa); 00080 return status; 00081 00082 } 00083 00084 protected: 00085 00086 /// Transform to \f$ t \in (0,1] \f$ 00087 virtual double transform(func_t &func, double t, param_t &pa) { 00088 double x=lb-(1-t)/t, y; 00089 func(x,y,pa); 00090 return y/t/t; 00091 } 00092 00093 }; 00094 00095 #ifndef DOXYGENP 00096 } 00097 #endif 00098 00099 #endif
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