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fastjet::Selector Class Reference

Class that encodes information about cuts and other selection criteria that can be applied to PseudoJet(s). More...

#include <fastjet/Selector.hh>

Classes

class  InvalidArea
 class that gets thrown when the area is requested from a Selector for which the area is not meaningful More...
 
class  InvalidWorker
 class that gets thrown when a Selector is applied despite it not having a valid underlying worker. More...
 

Public Member Functions

 Selector ()
 default constructor produces a Selector whose action is undefined (any attempt to use it will lead to an error)
 
 Selector (SelectorWorker *worker_in)
 constructor that causes the Selector to use the supplied worker More...
 
 Selector (const RangeDefinition &range)
 ctor from a RangeDefinition More...
 
virtual ~Selector ()
 dummy virtual dtor
 
bool pass (const PseudoJet &jet) const
 return true if the jet passes the selection
 
bool operator() (const PseudoJet &jet) const
 an operator way of knowing whether a given jet passes the selection or not
 
unsigned int count (const std::vector< PseudoJet > &jets) const
 Return a count of the objects that pass the selection. More...
 
PseudoJet sum (const std::vector< PseudoJet > &jets) const
 Return the 4-vector sum of the objects that pass the selection. More...
 
double scalar_pt_sum (const std::vector< PseudoJet > &jets) const
 Return the scalar pt sum of the objects that pass the selection. More...
 
void sift (const std::vector< PseudoJet > &jets, std::vector< PseudoJet > &jets_that_pass, std::vector< PseudoJet > &jets_that_fail) const
 sift the input jets into two vectors – those that pass the selector and those that do not
 
bool applies_jet_by_jet () const
 returns true if this can be applied jet by jet
 
std::vector< PseudoJetoperator() (const std::vector< PseudoJet > &jets) const
 returns a vector with the jets that pass the selection
 
virtual void nullify_non_selected (std::vector< const PseudoJet * > &jets) const
 For each jet that does not pass the cuts, this routine sets the pointer to 0. More...
 
void get_rapidity_extent (double &rapmin, double &rapmax) const
 returns the rapidity range for which it may return "true"
 
std::string description () const
 returns a textual description of the selector
 
bool is_geometric () const
 returns true if it is a geometric selector (i.e. More...
 
bool has_finite_area () const
 returns true if it has a meaningful and finite area (i.e. More...
 
double area () const
 returns the rapidity-phi area associated with the Selector (throws InvalidArea if the area does not make sense). More...
 
double area (double ghost_area) const
 returns the rapidity-phi area associated with the Selector (throws InvalidArea if the area does not make sense). More...
 
const SharedPtr< SelectorWorker > & worker () const
 returns a (reference to) the underlying worker's shared pointer
 
const SelectorWorkervalidated_worker () const
 returns a worker if there is a valid one, otherwise throws an InvalidWorker error
 
bool takes_reference () const
 returns true if this can be applied jet by jet
 
const Selectorset_reference (const PseudoJet &reference)
 set the reference jet for this Selector
 
Selectoroperator&= (const Selector &b)
 For 2 Selectors a and b, a &= b is eauivalent to a = a && b;.
 
Selectoroperator|= (const Selector &b)
 For 2 Selectors a and b, a |= b is eauivalent to a = a || b;.
 

Protected Member Functions

void _copy_worker_if_needed ()
 Helper for copying selector workers if needed. More...
 

Detailed Description

Class that encodes information about cuts and other selection criteria that can be applied to PseudoJet(s).

Definition at line 149 of file Selector.hh.

Constructor & Destructor Documentation

fastjet::Selector::Selector ( SelectorWorker worker_in)
inline

constructor that causes the Selector to use the supplied worker

Note that the Selector takes ownership of the pointer to the worker (and so will delete automatically when appropriate).

Definition at line 159 of file Selector.hh.

fastjet::Selector::Selector ( const RangeDefinition range)

ctor from a RangeDefinition

This is provided for backward compatibility and will be removed in a future major release of FastJet

Watch out that the Selector will only hold a pointer to the range so the selector will crash if one tries to use it after the range has gone out of scope. We thus strongly advise against the direct use of this constructor.

Definition at line 1475 of file Selector.cc.

Member Function Documentation

unsigned int fastjet::Selector::count ( const std::vector< PseudoJet > &  jets) const

Return a count of the objects that pass the selection.

This will often be more efficient that getting the vector of objects that passes and then evaluating the size of the vector

Definition at line 76 of file Selector.cc.

PseudoJet fastjet::Selector::sum ( const std::vector< PseudoJet > &  jets) const

Return the 4-vector sum of the objects that pass the selection.

This will often be more efficient that getting the vector of objects that passes and then evaluating the size of the vector

Definition at line 101 of file Selector.cc.

double fastjet::Selector::scalar_pt_sum ( const std::vector< PseudoJet > &  jets) const

Return the scalar pt sum of the objects that pass the selection.

This will often be more efficient that getting the vector of objects that passes and then evaluating the size of the vector

Definition at line 126 of file Selector.cc.

virtual void fastjet::Selector::nullify_non_selected ( std::vector< const PseudoJet * > &  jets) const
inlinevirtual

For each jet that does not pass the cuts, this routine sets the pointer to 0.

It is legitimate for some (or all) of the pointers that are passed to already be NULL.

Definition at line 227 of file Selector.hh.

bool fastjet::Selector::is_geometric ( ) const
inline

returns true if it is a geometric selector (i.e.

one that only puts constraints on rapidities and azimuthal angles)

Definition at line 243 of file Selector.hh.

bool fastjet::Selector::has_finite_area ( ) const
inline

returns true if it has a meaningful and finite area (i.e.

the Selector has the property that is_geometric() returns true and the rapidity extent is finite).

Definition at line 250 of file Selector.hh.

double fastjet::Selector::area ( ) const

returns the rapidity-phi area associated with the Selector (throws InvalidArea if the area does not make sense).

If the result is not known analytically, the area will be estimated using a pseudo Monte Carlo method (as for jet areas), using the default ghost area from the GhostedAreaSpec class (0.01). The Monte Carlo estimate involves a time penalty proportional to the ratio of the rapidity extent of the Selector divided by the ghost area.

Definition at line 189 of file Selector.cc.

double fastjet::Selector::area ( double  ghost_area) const

returns the rapidity-phi area associated with the Selector (throws InvalidArea if the area does not make sense).

The behaviour is the as with the area() call, but with the ability to additionally specify the ghost area to be used in the case of a Monte Carlo area evaluation.

Definition at line 194 of file Selector.cc.

void fastjet::Selector::_copy_worker_if_needed ( )
inlineprotected

Helper for copying selector workers if needed.

The following is needed if we want to modify a selectors that shares a worker with another selector. In that case, we need to get another copy of the worker to avoid interferences

Note that any non-const operation has to call this to behave correctly w.r.t shared workers!

Definition at line 339 of file Selector.hh.


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