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# Integral.cpp

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    00001 // $Id: Integral.cpp,v 1.2 2007/11/20 13:00:17 marcocle Exp $
    00002 // ============================================================================
    00003 // Include files
    00004 // ============================================================================
    00005 // GaudiKernel
    00006 // ============================================================================
    00007 #include "GaudiKernel/GaudiException.h"
    00008 // ============================================================================
    00009 // GaudiMath
    00010 // ============================================================================
    00011 #include "GaudiMath/Integral.h"
    00012 #include "GaudiMath/NumericalDefiniteIntegral.h"
    00013 #include "GaudiMath/Constant.h"
    00014 // ============================================================================
    00015
    00016 #ifdef __ICC
    00017 // disable icc remark #1572: floating-point equality and inequality comparisons are unreliable
    00018 //   The comparison are meant
    00019 #pragma warning(disable:1572)
    00020 // disable icc remark #2259: non-pointer conversion from "double" to "float" may lose significant bits
    00021 #pragma warning(disable:2259)
    00022 #endif
    00023
    00024 namespace GaudiMath
    00025 {
    00026
    00027   double Integral
    00028   ( const Genfun::AbsFunction&                function ,
    00029     const double                              a        ,
    00030     const double                              b        ,
    00031     const GaudiMath::Integration::Type        type     ,
    00032     const GaudiMath::Integration::KronrodRule rule     ,
    00033     const double                              epsabs   ,
    00034     const double                              epsrel   ,
    00035     const size_t                              size     )
    00036   {
    00037     if ( 1 != function.dimensionality() )
    00038       { throw GaudiException
    00039           ("GaudiMath::Integral: illegal function dimension" ,
    00040            "*GaudiMath*" , StatusCode::FAILURE ); }
    00041
    00042     const Genfun::AbsFunction& one   =
    00043       Genfun::GaudiMathImplementation::Constant ( 1.0 , 1 ) ;
    00044
    00045     const Genfun::AbsFunction& cross =
    00046       Genfun::FunctionDirectProduct (&one , &function ) ;
    00047
    00048     const Genfun::AbsFunction& result =
    00049       Genfun::GaudiMathImplementation::NumericalDefiniteIntegral
    00050       ( cross , 1 , a , b, type , rule , epsabs , epsrel , size ) ;
    00051
    00052     return result( Genfun::Argument(1) ) ;
    00053   }
    00054
    00055   double Integral
    00056   ( const Genfun::AbsFunction&                 function  ,
    00057     const double                               a         ,
    00058     const double                               b         ,
    00059     const std::vector<double>&                 points    ,
    00060     const double                               epsabs    ,
    00061     const double                               epsrel    ,
    00062     const size_t                               size      )
    00063   {
    00064
    00065   if ( 1 != function.dimensionality() )
    00066       { throw GaudiException
    00067           ("GaudiMath::Integral: illegal function dimension" ,
    00068            "*GaudiMath*" , StatusCode::FAILURE ); }
    00069
    00070     const Genfun::AbsFunction& one   =
    00071       Genfun::GaudiMathImplementation::Constant ( 1.0 , 1 ) ;
    00072
    00073     const Genfun::AbsFunction& cross =
    00074       Genfun::FunctionDirectProduct (&one , &function ) ;
    00075
    00076     const Genfun::AbsFunction& result =
    00077       Genfun::GaudiMathImplementation::NumericalDefiniteIntegral
    00078       ( cross , 1 , a , b, points , epsabs , epsrel , size ) ;
    00079
    00080     return result( Genfun::Argument(1) ) ;
    00081   }
    00082
    00083   double Integral
    00084   ( const Genfun::AbsFunction&                 function  ,
    00085     const double                               a         ,
    00086     const GaudiMath::Integration::Inf          b         ,
    00087     const double                               epsabs    ,
    00088     const double                               epsrel    ,
    00089     const size_t                               size      )
    00090   {
    00091     if ( 1 != function.dimensionality() )
    00092       { throw GaudiException
    00093           ("GaudiMath::Integral: illegal function dimension" ,
    00094            "*GaudiMath*" , StatusCode::FAILURE ); }
    00095
    00096     const Genfun::AbsFunction& one   =
    00097       Genfun::GaudiMathImplementation::Constant ( 1.0 , 1 ) ;
    00098
    00099     const Genfun::AbsFunction& cross =
    00100       Genfun::FunctionDirectProduct (&one , &function ) ;
    00101
    00102     const Genfun::AbsFunction& result =
    00103       Genfun::GaudiMathImplementation::NumericalDefiniteIntegral
    00104       ( cross , 1 , a , b , epsabs , epsrel , size ) ;
    00105
    00106     return result( Genfun::Argument(1) ) ;
    00107   }
    00108
    00109   double Integral
    00110   ( const Genfun::AbsFunction&                 function  ,
    00111     const GaudiMath::Integration::Inf          a         ,
    00112     const double                               b         ,
    00113     const double                               epsabs    ,
    00114     const double                               epsrel    ,
    00115     const size_t                               size      )
    00116   {
    00117     if ( 1 != function.dimensionality() )
    00118       { throw GaudiException
    00119           ("GaudiMath::Integral: illegal function dimension" ,
    00120            "*GaudiMath*" , StatusCode::FAILURE ); }
    00121
    00122     const Genfun::AbsFunction& one   =
    00123       Genfun::GaudiMathImplementation::Constant ( 1.0 , 1 ) ;
    00124
    00125     const Genfun::AbsFunction& cross =
    00126       Genfun::FunctionDirectProduct (&one , &function ) ;
    00127
    00128     const Genfun::AbsFunction& result =
    00129       Genfun::GaudiMathImplementation::NumericalDefiniteIntegral
    00130       ( cross , 1 , a , b , epsabs , epsrel , size ) ;
    00131
    00132     return result( Genfun::Argument(1) ) ;
    00133   }
    00134
    00135
    00136
    00137   double Integral
    00138   ( const Genfun::AbsFunction&                 function  ,
    00139     const GaudiMath::Integration::Inf          /* a  */  ,
    00140     const GaudiMath::Integration::Inf          /* b  */  ,
    00141     const double                               epsabs    ,
    00142     const double                               epsrel    ,
    00143     const size_t                               size      )
    00144   {
    00145     if ( 1 != function.dimensionality() )
    00146       { throw GaudiException
    00147           ("GaudiMath::Integral: illegal function dimension" ,
    00148            "*GaudiMath*" , StatusCode::FAILURE ); }
    00149
    00150     const Genfun::AbsFunction& one   =
    00151       Genfun::GaudiMathImplementation::Constant ( 1.0 , 1 ) ;
    00152
    00153     const Genfun::AbsFunction& cross =
    00154       Genfun::FunctionDirectProduct (&one , &function ) ;
    00155
    00156     // FIXME: (MCl) the static_cast below are needed to avoid warnings and to
    00157     // match the signature in NumericalDefiniteIntegral.h (around line 288).
    00158     const Genfun::AbsFunction& result =
    00159       Genfun::GaudiMathImplementation::NumericalDefiniteIntegral
    00160       ( cross , 1 , static_cast<float>(epsabs) , static_cast<float>(epsrel) , size ) ;
    00161
    00162     return result( Genfun::Argument(1) ) ;
    00163   }
    00164
    00165 }
    00166
    00167 // ============================================================================
    00168 // The END
    00169 // ============================================================================

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