| # Gaudi Framework, version v21r9 |

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# Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral Class Reference

The simple class for numerical integrations. More...

`#include <NumericalIndefiniteIntegral.h>`

Collaboration diagram for Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral:

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List of all members.

## Public Types
typedef std::vector< double > | Points
| typedef for vector of singular points
## Public Member Functions
| NumericalIndefiniteIntegral (const AbsFunction &function, const size_t index, const double a, const GaudiMath::Integration::Limit limit=GaudiMath::Integration::VariableHighLimit, const GaudiMath::Integration::Type type=GaudiMath::Integration::Adaptive, const GaudiMath::Integration::KronrodRule rule=GaudiMath::Integration::Default, const double epsabs=1e-10, const double epsrel=1.e-7, const size_t size=1000)
| From CLHEP/GenericFunctions.
| NumericalIndefiniteIntegral (const AbsFunction &function, const size_t index, const double a, const Points &points, const GaudiMath::Integration::Limit limit=GaudiMath::Integration::VariableHighLimit, const double epsabs=1e-9, const double epsrel=1.e-6, const size_t size=1000)
| standard constructor
| NumericalIndefiniteIntegral (const AbsFunction &function, const size_t index, const GaudiMath::Integration::Limit limit=GaudiMath::Integration::VariableHighLimit, const double epsabs=1e-9, const double epsrel=1.e-6, const size_t size=1000)
| standard constructor The function, created with this constructor evaluates following indefinite integral:
| NumericalIndefiniteIntegral (const NumericalIndefiniteIntegral &)
| copy constructor
virtual | ~NumericalIndefiniteIntegral ()
| destructor
virtual unsigned int | dimensionality () const
| dimensionality of the problem
virtual double | operator() (double argument) const
| Function value.
virtual double | operator() (const Argument &argument) const
| Function value.
virtual bool | hasAnalyticDerivative () const
| Does this function have an analytic derivative?
virtual Genfun::Derivative | partial (unsigned int index) const
| Derivatives.
const AbsFunction & | function () const
| accessor to the function itself
double | a () const
| integration limit
const Points & | points () const
| known singularities
double | epsabs () const
| absolute precision
double | epsrel () const
| relatiove precision
double | result () const
| previous result
double | error () const
| evaluate of previous error
size_t | size () const
GaudiMath::Integration::Limit | limit () const
| integration limit
GaudiMath::Integration::Type | type () const
| integration type
GaudiMath::Integration::Category | category () const
| integration category
GaudiMath::Integration::KronrodRule | rule () const
| integration rule
## Protected Member Functions
double | QAGI (_Function *fun) const
double | QAGP (_Function *fun) const
double | QNG (_Function *fun) const
double | QAG (_Function *fun) const
double | QAGS (_Function *fun) const
_Workspace * | allocate () const
| allocate the integration workspace
_Workspace * | ws () const
StatusCode | Exception (const std::string &message, const StatusCode &sc=StatusCode::FAILURE) const
## Private Member Functions
| NumericalIndefiniteIntegral ()
NumericalIndefiniteIntegral & | operator= (const NumericalIndefiniteIntegral &)
## Private Attributes
const AbsFunction * | m_function
size_t | m_DIM
size_t | m_index
double | m_a
GaudiMath::Integration::Limit | m_limit
GaudiMath::Integration::Type | m_type
GaudiMath::Integration::Category | m_category
GaudiMath::Integration::KronrodRule | m_rule
Points | m_points
double * | m_pdata
double | m_epsabs
double | m_epsrel
double | m_result
double | m_error
size_t | m_size
_Workspace * | m_ws
Argument | m_argument
## Classes
struct | _Function
struct | _Workspace

## Detailed Description

The simple class for numerical integrations.

It allows to evaluate following indefinite integrals:

Author:
  Vanya BELYAEV Ivan.Belyaev@itep.ru

Date:
  2003-08-31

Definition at line 76 of file NumericalIndefiniteIntegral.h.

## Member Typedef Documentation

typedef std::vector<double> Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::Points

typedef for vector of singular points

Definition at line 80 of file NumericalIndefiniteIntegral.h.

## Constructor & Destructor Documentation

Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::NumericalIndefiniteIntegral | ( | const AbsFunction & | function,
|  | const size_t | index,
|  | const double | a,
|  | const GaudiMath::Integration::Limit | limit = `GaudiMath::Integration::VariableHighLimit`,
|  | const GaudiMath::Integration::Type | type = `GaudiMath::Integration::Adaptive`,
|  | const GaudiMath::Integration::KronrodRule | rule = `GaudiMath::Integration::Default`,
|  | const double | epsabs = `1e-10`,
|  | const double | epsrel = `1.e-7`,
|  | const size_t | size = `1000` |
| ) |  |  |

From CLHEP/GenericFunctions.

from CLHEP/GenericFunctions

Standard constructor The function, created with this constructor evaluates following indefinite integral:

for value of `limit` = `VariableHighLimit` and the integral

for value of `limit` = `VariableLowLimit`

If function contains singularities, the `type` = `Type::AdaptiveSingular` need to be used

For faster integration of smooth function non-adaptive integration can be used: `type` = `Type::NonAdaptive` need to be used

For adaptive integration one can specify the order of Gauss-Kronrad integration rule `rule` = `KronrodRule::Gauss15` The higher-order rules give better accuracy for smooth functions, while lower-order rules save the time when the function contains local difficulties, such as discontinuites.

- The GSL routine `gsl_integration_qng` is used for `type` = `Type:NonAdaptive` :
- The GSL routine `gsl_integration_qag` is used for `type` = `Type:Adaptive` :
- The GSL routine `gsl_integration_qags` is used for `type` = `Type:AdaptiveSingular` :

Parameters:

  | function | the base function
  | index | the variable index
  | a | integration limit
  | limit | flag to distinguisch low variable limit from high variable limit
  | type | the integration type (adaptive, non-adaptive or adaptive for singular functions
  | key | Gauss-Kronrad integration rule
  | epsabs | absolute precision for integration
  | epsrel | relative precision for integration
  | lim | bisection limit

Standard constructor

Parameters:

  | function | the base function
  | index | the variable index
  | a | integration limit
  | limit | flag to distinguisch low variable limit from high variable limit
  | type | the integration type (adaptive, non-adaptive or adaptive for singular functions
  | key | Gauss-Kronrad integration rule
  | epsabs | absolute precision for integration
  | epsrel | relative precision for integration
  | lim | bisection limit

Definition at line 77 of file NumericalIndefiniteIntegral.cpp.

    00086       : AbsFunction ()
    00087       , m_function  ( function.clone()                    )
    00088       , m_DIM       ( function.dimensionality()           )
    00089       , m_index     ( index                               )
    00090       , m_a         ( a                                   )
    00091       , m_limit     ( limit                               )
    00092       , m_type      ( type                                )
    00093       , m_category  ( GaudiMath::Integration::Finite      )
    00094       , m_rule      ( rule                                )
    00095       //
    00096       , m_points    (                                     )
    00097       , m_pdata     ( 0                                   )
    00098       //
    00099       , m_epsabs    ( epsabs                              )
    00100       , m_epsrel    ( epsrel                              )
    00101       //
    00102       , m_result    ( GSL_NEGINF                          )
    00103       , m_error     ( GSL_POSINF                          )
    00104       //
    00105       , m_size      ( size                                )
    00106       , m_ws        ( 0                                   )
    00107       , m_argument  ( function.dimensionality()           )
    00108     {
    00109       if ( GaudiMath::Integration::Fixed == m_rule )
    00110         { m_rule = GaudiMath::Integration::Default ; }
    00111       if ( m_index >= m_DIM  )
    00112         { Exception("::constructor: invalid variable index") ; }
    00113     }

Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::NumericalIndefiniteIntegral | ( | const AbsFunction & | function,
|  | const size_t | index,
|  | const double | a,
|  | const Points & | points,
|  | const GaudiMath::Integration::Limit | limit = `GaudiMath::Integration::VariableHighLimit`,
|  | const double | epsabs = `1e-9`,
|  | const double | epsrel = `1.e-6`,
|  | const size_t | size = `1000` |
| ) |  |  |

standard constructor

The function, created with this constructor evaluates following indefinite integral:

for value of `limit` = `VariableHighLimit` and the integral

for value of `limit` = `VariableLowLimit`

The integrand is assumed to have a known discontinuities

- The GSL routine `gsl_integration_qagp` is used for integration

Parameters:

  | function | the base function
  | index | the variable index
  | a | integration limit
  | limit | flag to distinguisch low variable limit from high variable limit
  | points | list of known function singularities
  | epsabs | absolute precision for integration
  | epsrel | relative precision for integration
  | function | the base function
  | index | the variable index
  | a | integration limit
  | limit | flag to distinguisch low variable limit from high variable limit
  | points | list of known function singularities
  | epsabs | absolute precision for integration
  | epsrel | relative precision for integration

Definition at line 127 of file NumericalIndefiniteIntegral.cpp.

    00135       : AbsFunction ()
    00136       , m_function  ( function.clone()          )
    00137       , m_DIM       ( function.dimensionality() )
    00138       , m_index     ( index                     )
    00139       , m_a         ( a                         )
    00140       , m_limit     ( limit                     )
    00141       , m_type      ( GaudiMath::Integration::    Other )
    00142       , m_category  ( GaudiMath::Integration:: Singular )
    00143       , m_rule      ( GaudiMath::Integration::    Fixed )
    00144       , m_points    ( points  )
    00145       , m_pdata     ( 0       )
    00146       , m_epsabs    ( epsabs  )
    00147       , m_epsrel    ( epsrel  )
    00148       //
    00149       , m_result    ( GSL_NEGINF                          )
    00150       , m_error     ( GSL_POSINF                          )
    00151       //
    00152       , m_size      ( size                                )
    00153       , m_ws        ( 0                                   )
    00154       , m_argument  ( function.dimensionality()           )
    00155     {
    00156       if ( m_index >= m_DIM )
    00157         { Exception("::constructor: invalid variable index") ; }
    00158       m_pdata = new double[ 2 + m_points.size() ] ;
    00159       m_points.push_back( a ) ;
    00160       std::sort( m_points.begin() , m_points.end() ) ;
    00161       m_points.erase ( std::unique( m_points.begin () ,
    00162                                     m_points.end   () ) , m_points.end() );
    00163     }

Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::NumericalIndefiniteIntegral | ( | const AbsFunction & | function,
|  | const size_t | index,
|  | const GaudiMath::Integration::Limit | limit = `GaudiMath::Integration::VariableHighLimit`,
|  | const double | epsabs = `1e-9`,
|  | const double | epsrel = `1.e-6`,
|  | const size_t | size = `1000` |
| ) |  |  |

standard constructor The function, created with this constructor evaluates following indefinite integral:

standard constructor the integral limt is assumed to be infinity

for value of `limit` = `VariableHighLimit` and the integral

for value of `limit` = `VariableLowLimit`

- The GSL routines `gsl_integration_qagil` and `gsl_integration_qagiu` are used for adapive integration

Parameters:

  | function | the base function
  | index | the variable index
  | limit | flag to distinguisch low variable limit from high variable limit
  | singularities | list of known function singularities
  | function | the base function
  | index | the variable index
  | limit | flag to distinguisch low variable limit from high variable limit

Definition at line 175 of file NumericalIndefiniteIntegral.cpp.

    00181       : AbsFunction ()
    00182       , m_function  ( function.clone() )
    00183       , m_DIM       ( function.dimensionality() )
    00184       , m_index     ( index            )
    00185       , m_a         ( GSL_NEGINF       ) // should not be used!
    00186       , m_limit     ( limit            )
    00187       , m_type      ( GaudiMath::Integration::    Other )
    00188       , m_category  ( GaudiMath::Integration:: Infinite )
    00189       , m_rule      ( GaudiMath::Integration::    Fixed )
    00190       , m_points    (            )
    00191       , m_pdata     ( 0          )
    00192       , m_epsabs    ( epsabs     )
    00193       , m_epsrel    ( epsrel     )
    00194       , m_result    ( GSL_NEGINF )
    00195       , m_error     ( GSL_POSINF )
    00196       , m_size      ( size       )
    00197       , m_ws        ( 0          )
    00198       , m_argument  ( function.dimensionality()           )
    00199     {
    00200       if ( m_index >= m_DIM )
    00201         { Exception("::constructor: invalid variable index") ; }
    00202     }

Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::NumericalIndefiniteIntegral | ( | const NumericalIndefiniteIntegral & | right | ) |

copy constructor

Definition at line 210 of file NumericalIndefiniteIntegral.cpp.

    00211       : AbsFunction ()
    00212       , m_function  ( right.m_function->clone() )
    00213       , m_DIM       ( right.m_DIM      )
    00214       , m_index     ( right.m_index    )
    00215       , m_a         ( right.m_a        )
    00216       , m_limit     ( right.m_limit    )
    00217       , m_type      ( right.m_type     )
    00218       , m_category  ( right.m_category )
    00219       , m_rule      ( right.m_rule     )
    00220       , m_points    ( right.m_points   )
    00221       , m_pdata     ( 0 )           // attention
    00222       , m_epsabs    ( right.m_epsabs   )
    00223       , m_epsrel    ( right.m_epsrel   )
    00224       , m_result    ( GSL_NEGINF       )
    00225       , m_error     ( GSL_POSINF       )
    00226       , m_size      ( right.m_size     )
    00227       , m_ws        ( 0                )
    00228       , m_argument  ( right.m_argument )
    00229     {
    00230       m_pdata = new double[ 2 + m_points.size() ] ; // attention!
    00231     }

Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::~NumericalIndefiniteIntegral | ( |  | ) | `[virtual]`

destructor

Definition at line 238 of file NumericalIndefiniteIntegral.cpp.

    00239     {
    00240       if( 0 != m_ws )
    00241         {
    00242           gsl_integration_workspace_free ( m_ws->ws ) ;
    00243           delete m_ws ;
    00244           m_ws = 0 ;
    00245         }
    00246       if ( 0 != m_pdata    ) { delete m_pdata    ; m_pdata    = 0 ; }
    00247       if ( 0 != m_function ) { delete m_function ; m_function = 0 ; }
    00248     }

Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::NumericalIndefiniteIntegral | ( |  | ) | `[private]`

## Member Function Documentation

virtual unsigned int Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::dimensionality | ( |  | ) | const`[inline, virtual]`

dimensionality of the problem

Definition at line 278 of file NumericalIndefiniteIntegral.h.

    00278 { return m_DIM ; }

double Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::operator() | ( | double | argument | ) | const`[virtual]`

Function value.

evaluate the function

Definition at line 268 of file NumericalIndefiniteIntegral.cpp.

    00269     {
    00270       // reset the result and the error
    00271       m_result = GSL_NEGINF ;
    00272       m_error  = GSL_POSINF ;
    00273
    00274       // check the argument
    00275       if( 1 != m_DIM ) { Exception ( "operator(): invalid argument size " ) ; };
    00276
    00277       m_argument[0] = argument ;
    00278       return (*this) ( m_argument );
    00279     }

double Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::operator() | ( | const Argument & | argument | ) | const`[virtual]`

Function value.

evaluate the function

Definition at line 308 of file NumericalIndefiniteIntegral.cpp.

    00309     {
    00310       // reset the result and the error
    00311       m_result = GSL_NEGINF ;
    00312       m_error  = GSL_POSINF ;
    00313
    00314       // check the argument
    00315       if( argument.dimension() != m_DIM )
    00316         { Exception ( "operator(): invalid argument size " ) ; };
    00317
    00318       // copy the argument
    00319       {for( size_t i  = 0 ; i < m_DIM ; ++i ){ m_argument[i] = argument[i];}}
    00320
    00321       // create the helper object
    00322       GSL_Helper helper( *m_function , m_argument , m_index );
    00323
    00324       // use GSL to evaluate the numerical derivative
    00325       gsl_function F ;
    00326       F.function = &GSL_Adaptor ;
    00327       F.params   = &helper                 ;
    00328       _Function F1    ;
    00329       F1.fn      = &F ;
    00330
    00331       if        (  GaudiMath::Integration::Infinite         == category () )
    00332         { return   QAGI ( &F1 ) ; }                                // RETURN
    00333       else if   (  GaudiMath::Integration::Singular         == category () )
    00334         { return   QAGP ( &F1 ) ; }                                // RETURN
    00335       else if   (  GaudiMath::Integration::Finite           == category () )
    00336         if      (  GaudiMath::Integration::NonAdaptive      == type     () )
    00337           { return QNG  ( &F1 ) ; }                                // RETURN
    00338         else if (  GaudiMath::Integration::Adaptive         == type     () )
    00339           { return QAG  ( &F1 ) ; }                                // RETURN
    00340         else if (  GaudiMath::Integration::AdaptiveSingular == type     () )
    00341           { return QAGS ( &F1 ) ; }                                // RETURN
    00342         else
    00343           { Exception ( "::operator(): invalid type "  ); }
    00344       else
    00345         { Exception ( "::operator(): invalid category "  ); }
    00346
    00347       return 0 ;
    00348     }

virtual bool Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::hasAnalyticDerivative | ( |  | ) | const`[inline, virtual]`

Does this function have an analytic derivative?

Definition at line 286 of file NumericalIndefiniteIntegral.h.

    00286 { return true ;}

Genfun::Derivative Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::partial | ( | unsigned int | index | ) | const`[virtual]`

Derivatives.

Definition at line 286 of file NumericalIndefiniteIntegral.cpp.

    00287     {
    00288       if      ( idx >= m_DIM   )
    00289         { Exception ( "::partial(i): invalid variable index " ) ; };
    00290       if      ( idx != m_index )
    00291         {
    00292           const AbsFunction& aux = NumericalDerivative( *this , idx ) ;
    00293           return Genfun::FunctionNoop( &aux ) ;
    00294         }
    00295       else if ( GaudiMath::Integration::VariableLowLimit == limit () )
    00296         {
    00297           const AbsFunction& aux = -1 * function() ;
    00298           return Genfun::FunctionNoop( &aux ) ;
    00299         }
    00300       const AbsFunction& aux = function() ;
    00301       return Genfun::FunctionNoop( &aux ) ;
    00302     }

const AbsFunction& Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::function | ( |  | ) | const`[inline]`

accessor to the function itself

Definition at line 294 of file NumericalIndefiniteIntegral.h.

    00294 { return *m_function ; }

double Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::a | ( |  | ) | const`[inline]`

integration limit

Definition at line 296 of file NumericalIndefiniteIntegral.h.

    00296 { return         m_a ; }

const Points& Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::points | ( |  | ) | const`[inline]`

known singularities

Definition at line 298 of file NumericalIndefiniteIntegral.h.

    00298 { return    m_points ; }

double Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::epsabs | ( |  | ) | const`[inline]`

absolute precision

Definition at line 300 of file NumericalIndefiniteIntegral.h.

    00300 { return    m_epsabs ; }

double Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::epsrel | ( |  | ) | const`[inline]`

relatiove precision

Definition at line 302 of file NumericalIndefiniteIntegral.h.

    00302 { return    m_epsrel ; }

double Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::result | ( |  | ) | const`[inline]`

previous result

Definition at line 305 of file NumericalIndefiniteIntegral.h.

    00305 { return    m_result ; }

double Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::error | ( |  | ) | const`[inline]`

evaluate of previous error

Definition at line 307 of file NumericalIndefiniteIntegral.h.

    00307 { return     m_error ; }

size_t Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::size | ( | void |  | ) | const`[inline]`

Definition at line 310 of file NumericalIndefiniteIntegral.h.

    00310 { return      m_size ; }

GaudiMath::Integration::Limit Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::limit | ( |  | ) | const`[inline]`

integration limit

Definition at line 314 of file NumericalIndefiniteIntegral.h.

    00314 { return     m_limit ; }

GaudiMath::Integration::Type Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::type | ( |  | ) | const`[inline]`

integration type

Definition at line 317 of file NumericalIndefiniteIntegral.h.

    00317 { return      m_type ; }

GaudiMath::Integration::Category Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::category | ( |  | ) | const`[inline]`

integration category

Definition at line 320 of file NumericalIndefiniteIntegral.h.

    00320 { return  m_category ; }

GaudiMath::Integration::KronrodRule Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::rule | ( |  | ) | const`[inline]`

integration rule

Definition at line 323 of file NumericalIndefiniteIntegral.h.

    00323 { return      m_rule ; }

double Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::QAGI | ( | _Function * | fun | ) | const`[protected]`

Definition at line 370 of file NumericalIndefiniteIntegral.cpp.

    00371     {
    00372       // check the argument
    00373       if( 0 == F ) { Exception("::QAGI: invalid function"); }
    00374
    00375       const double x = m_argument[m_index] ;
    00376
    00377       // allocate workspace
    00378       if( 0 == ws() ) { allocate() ; }
    00379
    00380       int ierror = 0 ;
    00381       switch ( limit() )
    00382         {
    00383         case GaudiMath::Integration::VariableLowLimit  :
    00384           ierror = gsl_integration_qagiu ( F->fn     , x        ,
    00385                                            m_epsabs  , m_epsrel ,
    00386                                            size ()   , ws()->ws ,
    00387                                            &m_result , &m_error ) ; break ;
    00388         case GaudiMath::Integration::VariableHighLimit :
    00389           ierror = gsl_integration_qagil ( F->fn     , x        ,
    00390                                            m_epsabs  , m_epsrel ,
    00391                                            size ()   , ws()->ws ,
    00392                                            &m_result , &m_error ) ; break ;
    00393         default :
    00394           Exception ( "::QAGI: invalid mode" ) ;
    00395         };
    00396
    00397       if( ierror ) { gsl_error( "NumericalIndefiniteIntegral::QAGI" ,
    00398                                 __FILE__ , __LINE__ , ierror ) ;}
    00399
    00400       return m_result ;
    00401     }

double Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::QAGP | ( | _Function * | fun | ) | const`[protected]`

Definition at line 407 of file NumericalIndefiniteIntegral.cpp.

    00408     {
    00409       if( 0 == F ) { Exception("QAGP::invalid function") ; }
    00410
    00411       const double x = m_argument[m_index] ;
    00412       if ( m_a == x  )
    00413         {
    00414           m_result = 0    ;
    00415           m_error  = 0    ;   // EXACT !
    00416           return m_result ;
    00417         }
    00418
    00419       // no known singular points ?
    00420       if( points().empty() ) { return QAGS( F ) ; }
    00421
    00422       // integration limits
    00423       const double a = std::min ( m_a , x ) ;
    00424       const double b = std::max ( m_a , x ) ;
    00425
    00426       // "active" singular points
    00427       Points::const_iterator lower =
    00428         std::lower_bound ( points().begin() , points().end() , a ) ;
    00429       Points::const_iterator upper =
    00430         std::upper_bound ( points().begin() , points().end() , b ) ;
    00431
    00432       Points pnts ( upper - lower ) ;
    00433       std::copy( lower , upper , pnts.begin() );
    00434       if ( *lower != a       ) { pnts.insert( pnts.begin () , a ) ; }
    00435       if ( *upper != b       ) { pnts.insert( pnts.end   () , b ) ; }
    00436       std::copy( pnts.begin() , pnts.end() , m_pdata );
    00437       const size_t npts = pnts.size() ;
    00438
    00439       // use GSL
    00440       int ierror =
    00441         gsl_integration_qagp ( F->fn                ,
    00442                                m_pdata   , npts     ,
    00443                                m_epsabs  , m_epsrel ,
    00444                                size ()   , ws()->ws ,
    00445                                &m_result , &m_error ) ;
    00446
    00447       if( ierror ) { gsl_error( "NumericalIndefiniteIntegral::QAGI " ,
    00448                                 __FILE__ , __LINE__ , ierror ) ; }
    00449
    00450       // sign
    00451       if      ( GaudiMath::Integration::VariableHighLimit == limit()
    00452                 &&  x < m_a  ) { m_result *= -1 ; }
    00453       else if ( GaudiMath::Integration::VariableLowLimit  == limit()
    00454                 &&  x > m_a  ) { m_result *= -1 ; }
    00455
    00456       return m_result ;
    00457     }

double Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::QNG | ( | _Function * | fun | ) | const`[protected]`

Definition at line 463 of file NumericalIndefiniteIntegral.cpp.

    00464     {
    00465       if( 0 == F ) { Exception("QNG::invalid function") ; }
    00466
    00467       const double x = m_argument[m_index] ;
    00468       if ( m_a == x  )
    00469         {
    00470           m_result = 0    ;
    00471           m_error  = 0    ;   // EXACT !
    00472           return m_result ;
    00473         }
    00474
    00475       // integration limits
    00476       const double a = std::min ( m_a , x ) ;
    00477       const double b = std::max ( m_a , x ) ;
    00478
    00479       size_t neval = 0 ;
    00480       int ierror =
    00481         gsl_integration_qng ( F->fn                 ,
    00482                               a         ,         b ,
    00483                               m_epsabs  ,  m_epsrel ,
    00484                               &m_result , &m_error  , &neval  ) ;
    00485
    00486       if( ierror ) { gsl_error( "NumericalIndefiniteIntegral::QNG " ,
    00487                                 __FILE__ , __LINE__ , ierror ) ; }
    00488
    00489       // sign
    00490       if      ( GaudiMath::Integration::VariableHighLimit == limit()
    00491                 &&  x < m_a  ) { m_result *= -1 ; }
    00492       else if ( GaudiMath::Integration::VariableLowLimit  == limit()
    00493                 &&  x > m_a  ) { m_result *= -1 ; }
    00494
    00495       return m_result ;
    00496     }

double Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::QAG | ( | _Function * | fun | ) | const`[protected]`

Definition at line 501 of file NumericalIndefiniteIntegral.cpp.

    00502     {
    00503       if( 0 == F ) { Exception("QAG::invalid function") ; }
    00504
    00505       const double x = m_argument[m_index] ;
    00506       if ( m_a == x  )
    00507         {
    00508           m_result = 0    ;
    00509           m_error  = 0    ;   // EXACT !
    00510           return m_result ;
    00511         }
    00512
    00513       // allocate workspace
    00514       if( 0 == ws () ) { allocate () ; }
    00515
    00516       // integration limits
    00517       const double a = std::min ( m_a , x ) ;
    00518       const double b = std::max ( m_a , x ) ;
    00519
    00520       int ierror =
    00521         gsl_integration_qag ( F->fn                    ,
    00522                               a         ,            b ,
    00523                               m_epsabs  ,     m_epsrel ,
    00524                               size   () , (int) rule() , ws ()->ws ,
    00525                               &m_result ,     &m_error             );
    00526
    00527       if( ierror ) { gsl_error( "NumericalIndefiniteIntegral::QAG " ,
    00528                                 __FILE__ , __LINE__ , ierror ) ; }
    00529
    00530       // sign
    00531       if      ( GaudiMath::Integration::VariableHighLimit == limit()
    00532                 &&  x < m_a  ) { m_result *= -1 ; }
    00533       else if ( GaudiMath::Integration::VariableLowLimit  == limit()
    00534                 &&  x > m_a  ) { m_result *= -1 ; }
    00535
    00536       return m_result ;
    00537     }

double Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::QAGS | ( | _Function * | fun | ) | const`[protected]`

Definition at line 543 of file NumericalIndefiniteIntegral.cpp.

    00544     {
    00545       if( 0 == F ) { Exception("QAG::invalid function") ; }
    00546
    00547       const double x = m_argument[m_index] ;
    00548       if ( m_a == x  )
    00549         {
    00550           m_result = 0    ;
    00551           m_error  = 0    ;   // EXACT !
    00552           return m_result ;
    00553         }
    00554
    00555       // allocate workspace
    00556       if( 0 == ws () ) { allocate () ; }
    00557
    00558       // integration limits
    00559       const double a = std::min ( m_a , x ) ;
    00560       const double b = std::max ( m_a , x ) ;
    00561
    00562       int ierror =
    00563         gsl_integration_qags ( F->fn                ,
    00564                                a         , b        ,
    00565                                m_epsabs  , m_epsrel ,
    00566                                size   () , ws()->ws ,
    00567                                &m_result , &m_error );
    00568
    00569       if( ierror ) { gsl_error( "NumericalIndefiniteIntegral::QAGS " ,
    00570                                 __FILE__ , __LINE__ , ierror ) ; }
    00571
    00572       // sign
    00573       if      ( GaudiMath::Integration::VariableHighLimit == limit()
    00574                 &&  x < m_a  ) { m_result *= -1 ; }
    00575       else if ( GaudiMath::Integration::VariableLowLimit  == limit()
    00576                 &&  x > m_a  ) { m_result *= -1 ; }
    00577
    00578       return m_result ;
    00579     }

NumericalIndefiniteIntegral::_Workspace * Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::allocate | ( |  | ) | const`[protected]`

allocate the integration workspace

Definition at line 355 of file NumericalIndefiniteIntegral.cpp.

    00356     {
    00357       if ( 0 != m_ws ) { return m_ws; }
    00358       gsl_integration_workspace* aux =
    00359         gsl_integration_workspace_alloc( size () );
    00360       if ( 0 == aux ) { Exception ( "allocate()::invalid workspace" ) ; };
    00361       m_ws = new _Workspace() ;
    00362       m_ws->ws = aux ;
    00363       return m_ws ;
    00364     }

_Workspace* Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::ws | ( |  | ) | const`[inline, protected]`

Definition at line 341 of file NumericalIndefiniteIntegral.h.

    00342       { return m_ws ; };

StatusCode Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::Exception | ( | const std::string & | message,
|  | const StatusCode & | sc = `StatusCode::FAILURE` |
| ) |  |  | const`[protected]`

Definition at line 255 of file NumericalIndefiniteIntegral.cpp.

    00257     {
    00258       throw GaudiException( "NumericalIndefiniteIntegral::" + message ,
    00259                             "*GaudiMath*" , sc ) ;
    00260       return sc ;
    00261     }

NumericalIndefiniteIntegral& Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::operator= | ( | const NumericalIndefiniteIntegral & |  | ) | `[private]`

## Member Data Documentation

const AbsFunction* Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::m_function`[private]`

Definition at line 359 of file NumericalIndefiniteIntegral.h.

size_t Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::m_DIM`[private]`

Definition at line 360 of file NumericalIndefiniteIntegral.h.

size_t Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::m_index`[private]`

Definition at line 361 of file NumericalIndefiniteIntegral.h.

double Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::m_a`[private]`

Definition at line 363 of file NumericalIndefiniteIntegral.h.

GaudiMath::Integration::Limit Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::m_limit`[private]`

Definition at line 365 of file NumericalIndefiniteIntegral.h.

GaudiMath::Integration::Type Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::m_type`[private]`

Definition at line 366 of file NumericalIndefiniteIntegral.h.

GaudiMath::Integration::Category Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::m_category`[private]`

Definition at line 367 of file NumericalIndefiniteIntegral.h.

GaudiMath::Integration::KronrodRule Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::m_rule`[private]`

Definition at line 368 of file NumericalIndefiniteIntegral.h.

Points Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::m_points`[private]`

Definition at line 370 of file NumericalIndefiniteIntegral.h.

double* Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::m_pdata`[private]`

Definition at line 371 of file NumericalIndefiniteIntegral.h.

double Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::m_epsabs`[private]`

Definition at line 373 of file NumericalIndefiniteIntegral.h.

double Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::m_epsrel`[private]`

Definition at line 374 of file NumericalIndefiniteIntegral.h.

double Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::m_result`[mutable, private]`

Definition at line 376 of file NumericalIndefiniteIntegral.h.

double Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::m_error`[mutable, private]`

Definition at line 377 of file NumericalIndefiniteIntegral.h.

size_t Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::m_size`[private]`

Definition at line 379 of file NumericalIndefiniteIntegral.h.

_Workspace* Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::m_ws`[mutable, private]`

Definition at line 380 of file NumericalIndefiniteIntegral.h.

Argument Genfun::GaudiMathImplementation::NumericalIndefiniteIntegral::m_argument`[mutable, private]`

Definition at line 382 of file NumericalIndefiniteIntegral.h.

The documentation for this class was generated from the following files:

- /afs/cern.ch/sw/Gaudi/releases/GAUDI/GAUDI_v21r9/GaudiGSL/GaudiMath/NumericalIndefiniteIntegral.h
- /afs/cern.ch/sw/Gaudi/releases/GAUDI/GAUDI_v21r9/GaudiGSL/src/Lib/NumericalIndefiniteIntegral.cpp