WeightContainer Class Reference

#include <Weights.h>

Public Member Functions
	WeightContainer ()
void	setWeightNominal (double weightNow)
	The WeightContainer class. More...
double	collectWeightNominal ()
int	numberOfWeights ()
	Functions to retrieve information stored in the subcategory members. More...
double	weightValueByIndex (int key=0)
string	weightNameByIndex (int key=0)
vector< double >	weightValueVector ()
vector< string >	weightNameVector ()
void	clear ()
	Reset all members to default stage. More...
void	clearTotal ()
	Reset total cross section estimate.
void	init (bool doMerging)
	Init, for those classes that need it. More...
void	initPtrs (Info *infoPtrIn)
	Function to set Pointers in weight classes. More...
void	initXsecVec ()
	Initialize the cross-section vector. More...
vector< double >	getSampleXsec ()
	Get cross-section vectors. More...
vector< double >	getTotalXsec ()
	Return cross section estimate for total run.
vector< double >	getSampleXsecErr ()
	Return cross section error for current sample.
vector< double >	getTotalXsecErr ()
	Return cross section error estimate for total run.
void	accumulateXsec (double norm=1.)
	Accumulate cross section for all weights. More...

Public Attributes
double	weightNominal
	The nominal Pythia weight, in pb for lha strategy 4 and -4.
WeightsLHEF	weightsLHEF {}
	First example of a weight subcategory.
WeightsShower *	weightsShowerPtr {}
WeightsSimpleShower	weightsSimpleShower {}
WeightsMerging	weightsMerging {}
	Merging weights.
WeightsFragmentation	weightsFragmentation {}
	Fragmentation weights.
WeightsBase	weightsUserHooks {}
	Userhooks weights.

Detailed Description

This is a container class to collect all event generation weight information into a wrapper which is in turn is part of Info. In this way, we could avoid cluttering Info.

Constructor & Destructor Documentation

WeightContainer ( )

inline

Default constructor only ensures that members are initialized with sensible default values.

Member Function Documentation

void accumulateXsec

(

double

norm = 1.

)

Accumulate cross section for all weights.

Accumulate cross section for all weights. Provide cross section estimate for whole sample if lhaStrategy != 4 or -4.

void clear

(

)

Reset all members to default stage.

Reset all members to default status.

double collectWeightNominal

(

)

Assemble nominal weight, including nominal parton shower and merging weight. PS and Merging weight variations are stored relative to this return value.

vector< double > getSampleXsec

(

)

Get cross-section vectors.

Return cross section for current sample.

void init

(

bool

doMerging

)

Init, for those classes that need it.

Function to initialize weight classes.

void initPtrs

(

Info *

infoPtrIn

)

Function to set Pointers in weight classes.

Default pointer to shower weights = weightsSimpleShower.

void initXsecVec

(

)

Initialize the cross-section vector.

Initialize accumulation of cross section.

int numberOfWeights

(

)

Functions to retrieve information stored in the subcategory members.

Functions to retrieve the stored information.

void setWeightNominal

(

double

weightNow

)

The WeightContainer class.

Set nominal weight.

vector< string > weightNameVector

(

)

Function to return the vector of weight names, combining all names from all subcategories, cf. weightValueVector function.

The very first entry in the vector should always be the nominal weight.

Let all weights attach the weight names to the return vector.

Done.

vector< double > weightValueVector

(

)

Function to return the vector of weight values, combining all weights from all subcategories. Currently, only the nominal weight and LHEF weights are considered. Internal Pythia weights should also be included eventually.

Function to return the vector of weight values, combining all weights from all subcategories.

The very first entry in the vector should always be the nominal weight.

Let all weights attach the relative weight values to the return vector. Second argument allows for normalization.

Done.

Member Data Documentation

WeightsShower* weightsShowerPtr {}

Shower weights. SimpleShower one hardcoded and made default since Merging explicitly depends on it, but allow to point to a different weightsShower-derived object, eg for Vincia (with own merging).

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

• include/Pythia8/Weights.h
• src/Weights.cc