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_MULTI_INTE_H 00024 #define O2SCL_MULTI_INTE_H 00025 00026 #include <o2scl/inte.h> 00027 #include <o2scl/ovector_tlate.h> 00028 00029 #ifndef DOXYGENP 00030 namespace o2scl { 00031 #endif 00032 00033 /** 00034 \brief Multi-dimensional integration over a hypercube base class 00035 00036 Multi-dimensional integration over a region defined by constant 00037 limits. For more general regions of integration, use children of 00038 the class \ref gen_inte. 00039 */ 00040 template<class param_t, class func_t, 00041 class vec_t=ovector_view> class multi_inte { 00042 00043 public: 00044 00045 /** \brief Verbosity 00046 */ 00047 int verbose; 00048 00049 /** \brief The maximum "uncertainty" in the value of the integral 00050 (default \f$ 10^{-8} \f$). 00051 */ 00052 double tolf; 00053 00054 multi_inte() { 00055 tolf=1.0e-8; 00056 verbose=0; 00057 interror=0.0; 00058 } 00059 00060 virtual ~multi_inte() {} 00061 00062 /* \brief Integrate function \c func over the hypercube from 00063 \f$ x_i=a_i \f$ to \f$ x_i=b_i\ f$ for 00064 \f$ 0<i< \f$ ndim-1. 00065 */ 00066 // for some reason, \mathrm can't be used in the formula above 00067 virtual double minteg(func_t &func, size_t ndim, const vec_t &a, 00068 const vec_t &b, param_t &pa) 00069 { 00070 double res; 00071 minteg_err(func,ndim,a,b,pa,res,interror); 00072 return res; 00073 } 00074 00075 /* \brief Integrate function \c func over the hypercube from 00076 \f$ x_i=a_i \f$ to \f$ x_i=b_i \f$ for 00077 \f$ 0<i< \f$ ndim-1 00078 00079 */ 00080 virtual int minteg_err(func_t &func, size_t ndim, const vec_t &a, 00081 const vec_t &b, param_t &pa, double &res, 00082 double &err) 00083 { 00084 res=minteg(func,ndim,a,b,pa); 00085 return 0; 00086 } 00087 00088 /** \brief Return the error in the result from the last call to 00089 minteg() or minteg_err() 00090 00091 This will quietly return zero if no integrations have been 00092 performed. 00093 */ 00094 double get_error() { return interror; } 00095 00096 /// Return string denoting type ("multi_inte") 00097 const char *type() { return "multi_inte"; } 00098 00099 #ifndef DOXYGEN_INTERNAL 00100 00101 protected: 00102 00103 /// The uncertainty for the last integration computation 00104 double interror; 00105 00106 #endif 00107 00108 }; 00109 00110 #ifndef DOXYGENP 00111 } 00112 #endif 00113 00114 #endif 00115 00116 00117 00118 00119 00120
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