Integral.cpp

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// ============================================================================
// Include files
// ============================================================================
// GaudiKernel
// ============================================================================
#include "GaudiKernel/GaudiException.h"
// ============================================================================
// GaudiMath
// ============================================================================
#include "GaudiMath/Constant.h"
#include "GaudiMath/Integral.h"
#include "GaudiMath/NumericalDefiniteIntegral.h"
// ============================================================================

#ifdef __ICC
// disable icc remark #1572: floating-point equality and inequality comparisons are unreliable
//   The comparison are meant
#pragma warning( disable : 1572 )
// disable icc remark #2259: non-pointer conversion from "double" to "float" may lose significant bits
#pragma warning( disable : 2259 )
#endif

namespace GaudiMath
{

  double Integral( const Genfun::AbsFunction& function, const double a, const double b,
                   const GaudiMath::Integration::Type type, const GaudiMath::Integration::KronrodRule rule,
                   const double epsabs, const double epsrel, const size_t size )
  {
    if ( 1 != function.dimensionality() ) {
      throw GaudiException( "GaudiMath::Integral: illegal function dimension", "*GaudiMath*", StatusCode::FAILURE );
    }

    const Genfun::AbsFunction& one = Genfun::GaudiMathImplementation::Constant( 1.0, 1 );

    const Genfun::AbsFunction& cross = Genfun::FunctionDirectProduct( &one, &function );

    const Genfun::AbsFunction& result =
        Genfun::GaudiMathImplementation::NumericalDefiniteIntegral( cross, 1, a, b, type, rule, epsabs, epsrel, size );

    return result( Genfun::Argument( 1 ) );
  }

  double Integral( const Genfun::AbsFunction& function, const double a, const double b,
                   const std::vector<double>& points, const double epsabs, const double epsrel, const size_t size )
  {

    if ( 1 != function.dimensionality() ) {
      throw GaudiException( "GaudiMath::Integral: illegal function dimension", "*GaudiMath*", StatusCode::FAILURE );
    }

    const Genfun::AbsFunction& one = Genfun::GaudiMathImplementation::Constant( 1.0, 1 );

    const Genfun::AbsFunction& cross = Genfun::FunctionDirectProduct( &one, &function );

    const Genfun::AbsFunction& result =
        Genfun::GaudiMathImplementation::NumericalDefiniteIntegral( cross, 1, a, b, points, epsabs, epsrel, size );

    return result( Genfun::Argument( 1 ) );
  }

  double Integral( const Genfun::AbsFunction& function, const double a, const GaudiMath::Integration::Inf b,
                   const double epsabs, const double epsrel, const size_t size )
  {
    if ( 1 != function.dimensionality() ) {
      throw GaudiException( "GaudiMath::Integral: illegal function dimension", "*GaudiMath*", StatusCode::FAILURE );
    }

    const Genfun::AbsFunction& one = Genfun::GaudiMathImplementation::Constant( 1.0, 1 );

    const Genfun::AbsFunction& cross = Genfun::FunctionDirectProduct( &one, &function );

    const Genfun::AbsFunction& result =
        Genfun::GaudiMathImplementation::NumericalDefiniteIntegral( cross, 1, a, b, epsabs, epsrel, size );

    return result( Genfun::Argument( 1 ) );
  }

  double Integral( const Genfun::AbsFunction& function, const GaudiMath::Integration::Inf a, const double b,
                   const double epsabs, const double epsrel, const size_t size )
  {
    if ( 1 != function.dimensionality() ) {
      throw GaudiException( "GaudiMath::Integral: illegal function dimension", "*GaudiMath*", StatusCode::FAILURE );
    }

    const Genfun::AbsFunction& one = Genfun::GaudiMathImplementation::Constant( 1.0, 1 );

    const Genfun::AbsFunction& cross = Genfun::FunctionDirectProduct( &one, &function );

    const Genfun::AbsFunction& result =
        Genfun::GaudiMathImplementation::NumericalDefiniteIntegral( cross, 1, a, b, epsabs, epsrel, size );

    return result( Genfun::Argument( 1 ) );
  }

  double Integral( const Genfun::AbsFunction& function, const GaudiMath::Integration::Inf /* a  */,
                   const GaudiMath::Integration::Inf /* b  */, const double epsabs, const double epsrel,
                   const size_t size )
  {
    if ( 1 != function.dimensionality() ) {
      throw GaudiException( "GaudiMath::Integral: illegal function dimension", "*GaudiMath*", StatusCode::FAILURE );
    }

    const Genfun::AbsFunction& one = Genfun::GaudiMathImplementation::Constant( 1.0, 1 );

    const Genfun::AbsFunction& cross = Genfun::FunctionDirectProduct( &one, &function );

    // FIXME: (MCl) the static_cast below are needed to avoid warnings and to
    // match the signature in NumericalDefiniteIntegral.h (around line 288).
    const Genfun::AbsFunction& result = Genfun::GaudiMathImplementation::NumericalDefiniteIntegral(
        cross, 1, static_cast<float>( epsabs ), static_cast<float>( epsrel ), size );

    return result( Genfun::Argument( 1 ) );
  }
}

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// The END
// ============================================================================