TTree-backed data storage.

When a file is opened before creating the data storage, the storage will be file-backed. This reduces memory pressure because it allows storing the data in the file and reading it on demand. For a completely memory-backed storage, which is faster than the file-backed storage, RooVectorDataStore can be used.

With tree-backed storage, the tree can be found in the file with the name RooTreeDataStore_name_title for a dataset created as RooDataSet("name", "title", ...).

Note: A file needs to be opened before creating the data storage to enable file-backed storage.
TFile outputFile("filename.root", "RECREATE");

RooAbsData::setDefaultStorageType(RooAbsData::Tree);

RooDataSet mydata(...);

RooAbsData::setDefaultStorageType
static void setDefaultStorageType(StorageType s)
Definition RooAbsData.cxx:133

RooAbsData::Tree
@ Tree
Definition RooAbsData.h:280

RooDataSet
Container class to hold unbinned data.
Definition RooDataSet.h:34

TFile
A ROOT file is an on-disk file, usually with extension .root, that stores objects in a file-system-li...
Definition TFile.h:53

One can also change between TTree- and std::vector-backed storage using RooAbsData::convertToTreeStore() and RooAbsData::convertToVectorStore().

Definition at line 34 of file RooTreeDataStore.h.

Public Member Functions
	RooTreeDataStore ()

	RooTreeDataStore (const RooTreeDataStore &other, const char *newname=nullptr)

	RooTreeDataStore (const RooTreeDataStore &other, const RooArgSet &vars, const char *newname=nullptr)

	RooTreeDataStore (RooStringView name, RooStringView title, const RooArgSet &vars, const char *wgtVarName=nullptr)

	RooTreeDataStore (RooStringView name, RooStringView title, const RooArgSet &vars, const RooAbsDataStore &tds, const char selExpr=nullptr, const char wgtVarName=nullptr)

	RooTreeDataStore (RooStringView name, RooStringView title, const RooArgSet &vars, TTree &t, const char selExpr=nullptr, const char wgtVarName=nullptr)

	RooTreeDataStore (RooStringView name, RooStringView title, RooAbsDataStore &tds, const RooArgSet &vars, const RooFormulaVar cutVar, const char cutRange, Int_t nStart, Int_t nStop, const char *wgtVarName=nullptr)

	RooTreeDataStore (TTree t, const RooArgSet &vars, const char wgtVarName=nullptr)
	Constructor to facilitate reading of legacy RooDataSets.

	~RooTreeDataStore () override
	Destructor.

RooAbsArg *	addColumn (RooAbsArg &var, bool adjustRange=true) override
	Add a new column to the data set which holds the pre-calculated values of 'newVar'.

void	append (RooAbsDataStore &other) override

void	attachBuffers (const RooArgSet &extObs) override

void	cacheArgs (const RooAbsArg owner, RooArgSet &varSet, const RooArgSet nset=nullptr, bool skipZeroWeights=false) override
	Cache given RooAbsArgs with this tree: The tree is given direct write access of the args internal cache the args values is pre-calculated for all data points in this data collection.

const RooAbsArg *	cacheOwner () override

bool	changeObservableName (const char from, const char to) override
	Change name of internal observable named 'from' into 'to'.

void	checkInit () const override

RooAbsDataStore *	clone (const char *newname=nullptr) const override

RooAbsDataStore *	clone (const RooArgSet &vars, const char *newname=nullptr) const override

void	Draw (Option_t *option="") override
	Default Draw method for all objects.

Int_t	Fill ()
	Interface function to TTree::Fill.

Int_t	fill () override
	Interface function to TTree::Fill.

virtual const RooArgSet *	get () const

const RooArgSet *	get (Int_t index) const override
	Load the n-th data point (n='index') in memory and return a pointer to the internal RooArgSet holding its coordinates.

virtual const RooArgSet *	get (Int_t index) const=0

RooAbsData::RealSpans	getBatches (std::size_t first, std::size_t len) const override
	Retrieve batches for all observables in this data store.

Stat_t	GetEntries () const
	Interface function to TTree::GetEntries.

Int_t	GetEntry (Int_t entry=0, Int_t getall=0)
	Interface function to TTree::GetEntry.

std::span< const double >	getWeightBatch (std::size_t first, std::size_t len) const override
	Get the weights of the events in the range [first, first+len).

TClass *	IsA () const override

bool	isWeighted () const override

void	loadValues (const RooAbsDataStore tds, const RooFormulaVar select=nullptr, const char *rangeName=nullptr, std::size_t nStart=0, std::size_t nStop=std::numeric_limits< std::size_t >::max()) override
	Load values from dataset 't' into this data collection, optionally selecting events using 'select' RooFormulaVar.

void	loadValues (const TTree t, const RooFormulaVar select=nullptr, const char *rangeName=nullptr, Int_t nStart=0, Int_t nStop=2000000000)
	Load values from tree 't' into this data collection, optionally selecting events using the RooFormulaVar 'select'.

RooAbsDataStore *	merge (const RooArgSet &allvars, std::list< RooAbsDataStore * > dstoreList) override
	Merge columns of supplied data set(s) with this data set.

Int_t	numEntries () const override

std::unique_ptr< RooAbsDataStore >	reduce (RooStringView name, RooStringView title, const RooArgSet &vars, const RooFormulaVar cutVar, const char cutRange, std::size_t nStart, std::size_t nStop) override

void	reset () override

void	Reset (Option_t *option=nullptr)
	Interface function to TTree::Reset.

void	resetBuffers () override

void	resetCache () override
	Remove tree with values of cached observables and clear list of cached observables.

void	restoreAlternateBuffers ()

const RooArgSet &	row ()

void	setArgStatus (const RooArgSet &set, bool active) override
	Activate or deactivate the branch status of the TTree branch associated with the given set of dataset observables.

void	setExternalWeightArray (const double arrayWgt, const double arrayWgtErrLo, const double arrayWgtErrHi, const double arraySumW2) override

void	Streamer (TBuffer &) override
	Stream an object of class RooTreeDataStore.

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

double	sumEntries () const override

TTree &	tree ()

const TTree *	tree () const override

double	weight () const override
	Return the weight of the n-th data point (n='index') in memory.

virtual double	weight () const=0

double	weight (Int_t index) const

void	weightError (double &lo, double &hi, RooAbsData::ErrorType etype=RooAbsData::Poisson) const override

double	weightError (RooAbsData::ErrorType etype=RooAbsData::Poisson) const override

Public Member Functions inherited from RooAbsDataStore
	RooAbsDataStore ()

	RooAbsDataStore (const RooAbsDataStore &other, const char *newname=nullptr)

	RooAbsDataStore (const RooAbsDataStore &other, const RooArgSet &vars, const char *newname=nullptr)

	RooAbsDataStore (RooStringView name, RooStringView title, const RooArgSet &vars)

RooArgSet *	addColumns (const RooArgList &varList)

const RooArgSet &	cachedVars () const

int	defaultPrintContents (Option_t *) const override
	Define default print options, for a given print style.

bool	dirtyProp () const

virtual void	dump ()

virtual void	forceCacheUpdate ()

virtual RooAbsData::CategorySpans	getCategoryBatches (std::size_t, std::size_t) const

virtual bool	hasFilledCache () const

void	Print (Option_t *options=nullptr) const override
	This method must be overridden when a class wants to print itself.

void	printArgs (std::ostream &os) const override
	Print argument of dataset, i.e. the observable names.

void	printClassName (std::ostream &os) const override
	Print class name of dataset.

void	printMultiline (std::ostream &os, Int_t content, bool verbose, TString indent) const override
	Detailed printing interface.

void	printName (std::ostream &os) const override
	Print name of dataset.

void	printTitle (std::ostream &os) const override
	Print title of dataset.

void	printValue (std::ostream &os) const override
	Print value of the dataset, i.e. the sum of weights contained in the dataset.

virtual void	recalculateCache (const RooArgSet *, Int_t, Int_t, Int_t, bool)

virtual void	setDirtyProp (bool flag)

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

double	weight (Int_t index) const

Public Member Functions inherited from TNamed
	TNamed ()

	TNamed (const char name, const char title)

	TNamed (const TNamed &named)
	TNamed copy ctor.

	TNamed (const TString &name, const TString &title)

virtual	~TNamed ()
	TNamed destructor.

void	Clear (Option_t *option="") override
	Set name and title to empty strings ("").

TObject *	Clone (const char *newname="") const override
	Make a clone of an object using the Streamer facility.

Int_t	Compare (const TObject *obj) const override
	Compare two TNamed objects.

void	Copy (TObject &named) const override
	Copy this to obj.

virtual void	FillBuffer (char *&buffer)
	Encode TNamed into output buffer.

const char *	GetName () const override
	Returns name of object.

const char *	GetTitle () const override
	Returns title of object.

ULong_t	Hash () const override
	Return hash value for this object.

TClass *	IsA () const override

Bool_t	IsSortable () const override

void	ls (Option_t *option="") const override
	List TNamed name and title.

TNamed &	operator= (const TNamed &rhs)
	TNamed assignment operator.

void	Print (Option_t *option="") const override
	Print TNamed name and title.

virtual void	SetName (const char *name)
	Set the name of the TNamed.

virtual void	SetNameTitle (const char name, const char title)
	Set all the TNamed parameters (name and title).

virtual void	SetTitle (const char *title="")
	Set the title of the TNamed.

virtual Int_t	Sizeof () const
	Return size of the TNamed part of the TObject.

void	Streamer (TBuffer &) override
	Stream an object of class TObject.

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

Public Member Functions inherited from TObject
	TObject ()
	TObject constructor.

	TObject (const TObject &object)
	TObject copy ctor.

virtual	~TObject ()
	TObject destructor.

void	AbstractMethod (const char *method) const
	Use this method to implement an "abstract" method that you don't want to leave purely abstract.

virtual void	AppendPad (Option_t *option="")
	Append graphics object to current pad.

virtual void	Browse (TBrowser *b)
	Browse object. May be overridden for another default action.

ULong_t	CheckedHash ()
	Check and record whether this class has a consistent Hash/RecursiveRemove setup (*) and then return the regular Hash value for this object.

virtual const char *	ClassName () const
	Returns name of class to which the object belongs.

virtual void	Delete (Option_t *option="")
	Delete this object.

virtual Int_t	DistancetoPrimitive (Int_t px, Int_t py)
	Computes distance from point (px,py) to the object.

virtual void	DrawClass () const
	Draw class inheritance tree of the class to which this object belongs.

virtual TObject *	DrawClone (Option_t *option="") const
	Draw a clone of this object in the current selected pad with: `gROOT->SetSelectedPad(c1)`.

virtual void	Dump () const
	Dump contents of object on stdout.

virtual void	Error (const char method, const char msgfmt,...) const
	Issue error message.

virtual void	Execute (const char method, const char params, Int_t *error=nullptr)
	Execute method on this object with the given parameter string, e.g.

virtual void	Execute (TMethod method, TObjArray params, Int_t *error=nullptr)
	Execute method on this object with parameters stored in the TObjArray.

virtual void	ExecuteEvent (Int_t event, Int_t px, Int_t py)
	Execute action corresponding to an event at (px,py).

virtual void	Fatal (const char method, const char msgfmt,...) const
	Issue fatal error message.

virtual TObject *	FindObject (const char *name) const
	Must be redefined in derived classes.

virtual TObject *	FindObject (const TObject *obj) const
	Must be redefined in derived classes.

virtual Option_t *	GetDrawOption () const
	Get option used by the graphics system to draw this object.

virtual const char *	GetIconName () const
	Returns mime type name of object.

virtual char *	GetObjectInfo (Int_t px, Int_t py) const
	Returns string containing info about the object at position (px,py).

virtual Option_t *	GetOption () const

virtual UInt_t	GetUniqueID () const
	Return the unique object id.

virtual Bool_t	HandleTimer (TTimer *timer)
	Execute action in response of a timer timing out.

Bool_t	HasInconsistentHash () const
	Return true is the type of this object is known to have an inconsistent setup for Hash and RecursiveRemove (i.e.

virtual void	Info (const char method, const char msgfmt,...) const
	Issue info message.

virtual Bool_t	InheritsFrom (const char *classname) const
	Returns kTRUE if object inherits from class "classname".

virtual Bool_t	InheritsFrom (const TClass *cl) const
	Returns kTRUE if object inherits from TClass cl.

virtual void	Inspect () const
	Dump contents of this object in a graphics canvas.

void	InvertBit (UInt_t f)

Bool_t	IsDestructed () const
	IsDestructed.

virtual Bool_t	IsEqual (const TObject *obj) const
	Default equal comparison (objects are equal if they have the same address in memory).

virtual Bool_t	IsFolder () const
	Returns kTRUE in case object contains browsable objects (like containers or lists of other objects).

R__ALWAYS_INLINE Bool_t	IsOnHeap () const

R__ALWAYS_INLINE Bool_t	IsZombie () const

void	MayNotUse (const char *method) const
	Use this method to signal that a method (defined in a base class) may not be called in a derived class (in principle against good design since a child class should not provide less functionality than its parent, however, sometimes it is necessary).

virtual Bool_t	Notify ()
	This method must be overridden to handle object notification (the base implementation is no-op).

void	Obsolete (const char method, const char asOfVers, const char *removedFromVers) const
	Use this method to declare a method obsolete.

void	operator delete (void *ptr)
	Operator delete.

void	operator delete (void ptr, void vp)
	Only called by placement new when throwing an exception.

void	operator delete[] (void *ptr)
	Operator delete [].

void	operator delete[] (void ptr, void vp)
	Only called by placement new[] when throwing an exception.

void *	operator new (size_t sz)

void *	operator new (size_t sz, void *vp)

void *	operator new[] (size_t sz)

void *	operator new[] (size_t sz, void *vp)

TObject &	operator= (const TObject &rhs)
	TObject assignment operator.

virtual void	Paint (Option_t *option="")
	This method must be overridden if a class wants to paint itself.

virtual void	Pop ()
	Pop on object drawn in a pad to the top of the display list.

virtual Int_t	Read (const char *name)
	Read contents of object with specified name from the current directory.

virtual void	RecursiveRemove (TObject *obj)
	Recursively remove this object from a list.

void	ResetBit (UInt_t f)

virtual void	SaveAs (const char filename="", Option_t option="") const
	Save this object in the file specified by filename.

virtual void	SavePrimitive (std::ostream &out, Option_t *option="")
	Save a primitive as a C++ statement(s) on output stream "out".

void	SetBit (UInt_t f)

void	SetBit (UInt_t f, Bool_t set)
	Set or unset the user status bits as specified in f.

virtual void	SetDrawOption (Option_t *option="")
	Set drawing option for object.

virtual void	SetUniqueID (UInt_t uid)
	Set the unique object id.

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

virtual void	SysError (const char method, const char msgfmt,...) const
	Issue system error message.

R__ALWAYS_INLINE Bool_t	TestBit (UInt_t f) const

Int_t	TestBits (UInt_t f) const

virtual void	UseCurrentStyle ()
	Set current style settings in this object This function is called when either TCanvas::UseCurrentStyle or TROOT::ForceStyle have been invoked.

virtual void	Warning (const char method, const char msgfmt,...) const
	Issue warning message.

virtual Int_t	Write (const char *name=nullptr, Int_t option=0, Int_t bufsize=0)
	Write this object to the current directory.

virtual Int_t	Write (const char *name=nullptr, Int_t option=0, Int_t bufsize=0) const
	Write this object to the current directory.

Public Member Functions inherited from RooPrintable
	RooPrintable ()

virtual	~RooPrintable ()

virtual StyleOption	defaultPrintStyle (Option_t *opt) const

virtual void	printAddress (std::ostream &os) const
	Print class name of object.

virtual void	printExtras (std::ostream &os) const
	Interface to print extras of object.

virtual void	printStream (std::ostream &os, Int_t contents, StyleOption style, TString indent="") const
	Print description of object on ostream, printing contents set by contents integer, which is interpreted as an OR of 'enum ContentsOptions' values and in the style given by 'enum StyleOption'.

virtual void	printTree (std::ostream &os, TString indent="") const
	Interface for tree structure printing of object.

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

Static Public Member Functions
static TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static const char *	DeclFileName ()

Static Public Member Functions inherited from RooAbsDataStore
static TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static const char *	DeclFileName ()

Static Public Member Functions inherited from TNamed
static TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static const char *	DeclFileName ()

Static Public Member Functions inherited from TObject
static TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static const char *	DeclFileName ()

static Longptr_t	GetDtorOnly ()
	Return destructor only flag.

static Bool_t	GetObjectStat ()
	Get status of object stat flag.

static void	SetDtorOnly (void *obj)
	Set destructor only flag.

static void	SetObjectStat (Bool_t stat)
	Turn on/off tracking of objects in the TObjectTable.

Static Public Member Functions inherited from RooPrintable
static TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static const char *	DeclFileName ()

static std::ostream &	defaultPrintStream (std::ostream *os=nullptr)
	Return a reference to the current default stream to use in Print().

static void	nameFieldLength (Int_t newLen)
	Set length of field reserved from printing name of RooAbsArgs in multi-line collection printing to given amount.

Private Member Functions
void	attachCache (const RooAbsArg *newOwner, const RooArgSet &cachedVars) override
	Initialize cache of dataset: attach variables of cache ArgSet to the corresponding TTree branches.

void	createTree (RooStringView name, RooStringView title)
	Create TTree object that lives in memory, independent of current location of gDirectory.

Int_t	getBranchBufferSize () const

void	initialize ()
	One-time initialization common to all constructor forms.

std::string	makeTreeName () const
	Generate a name for the storage tree from the name and title of this instance.

void	setBranchBufferSize (Int_t size)

RooArgSet	varsNoWeight (const RooArgSet &allVars, const char *wgtName=nullptr)
	Utility function for constructors Return RooArgSet that is copy of allVars minus variable matching wgtName if specified.

RooRealVar *	weightVar (const RooArgSet &allVars, const char *wgtName=nullptr)
	Utility function for constructors Return pointer to weight variable if it is defined.

Private Attributes
RooArgSet	_attachedBuffers
	! Currently attached buffers (if different from _varsww)

const RooAbsArg *	_cacheOwner = nullptr
	TTree holding the cached function values.

TTree *	_cacheTree = nullptr

double	_curWgt = 1.0
	Buffer for weights in case a batch of values is requested.

double	_curWgtErr = 0.0
	Weight of current event.

double	_curWgtErrHi = 0.0
	Weight of current event.

double	_curWgtErrLo = 0.0
	Weight of current event.

bool	_defCtor = false
	Object owning cache contents.

const double *	_extSumW2Array {nullptr}
	! External sum of weights array

const double *	_extWgtArray {nullptr}
	! External weight array

const double *	_extWgtErrHiArray {nullptr}
	! External weight array - high error

const double *	_extWgtErrLoArray {nullptr}
	! External weight array - low error

TTree *	_tree = nullptr

RooArgSet	_varsww
	Was object constructed with default ctor?

std::unique_ptr< std::vector< double > >	_weightBuffer

RooRealVar *	_wgtVar = nullptr

Static Private Attributes
static Int_t	_defTreeBufSize = 1010241024

Friends
class	RooVectorDataStore

Additional Inherited Members
Public Types inherited from TObject
enum	{ kIsOnHeap = 0x01000000 , kNotDeleted = 0x02000000 , kZombie = 0x04000000 , kInconsistent = 0x08000000 , kBitMask = 0x00ffffff }

enum	{ kSingleKey = (1ULL << ( 0 )) , kOverwrite = (1ULL << ( 1 )) , kWriteDelete = (1ULL << ( 2 )) }

enum	EDeprecatedStatusBits { kObjInCanvas = (1ULL << ( 3 )) }

enum	EStatusBits { kCanDelete = (1ULL << ( 0 )) , kMustCleanup = (1ULL << ( 3 )) , kIsReferenced = (1ULL << ( 4 )) , kHasUUID = (1ULL << ( 5 )) , kCannotPick = (1ULL << ( 6 )) , kNoContextMenu = (1ULL << ( 8 )) , kInvalidObject = (1ULL << ( 13 )) }

Public Types inherited from RooPrintable
enum	ContentsOption { kName =1 , kClassName =2 , kValue =4 , kArgs =8 , kExtras =16 , kAddress =32 , kTitle =64 , kCollectionHeader =128 }

enum	StyleOption { kInline =1 , kSingleLine =2 , kStandard =3 , kVerbose =4 , kTreeStructure =5 }

Protected Types inherited from TObject
enum	{ kOnlyPrepStep = (1ULL << ( 3 )) }

Protected Member Functions inherited from TObject
virtual void	DoError (int level, const char location, const char fmt, va_list va) const
	Interface to ErrorHandler (protected).

void	MakeZombie ()

Protected Attributes inherited from RooAbsDataStore
RooArgSet	_cachedVars

bool	_doDirtyProp = true
	Switch do (de)activate dirty state propagation when loading a data point.

RooArgSet	_vars

Protected Attributes inherited from TNamed
TString	fName

TString	fTitle

Static Protected Attributes inherited from RooPrintable
static Int_t	_nameLength

#include <RooTreeDataStore.h>

Inheritance diagram for RooTreeDataStore:

[legend]

Constructor & Destructor Documentation

◆ RooTreeDataStore() [1/8]

RooTreeDataStore::RooTreeDataStore ( )

Definition at line 74 of file RooTreeDataStore.cxx.

◆ RooTreeDataStore() [2/8]

RooTreeDataStore::RooTreeDataStore	(	TTree *	t,
		const RooArgSet &	vars,
		const char *	wgtVarName = `nullptr`
	)

Constructor to facilitate reading of legacy RooDataSets.

Definition at line 81 of file RooTreeDataStore.cxx.

◆ RooTreeDataStore() [3/8]

RooTreeDataStore::RooTreeDataStore	(	RooStringView	name,
		RooStringView	title,
		const RooArgSet &	vars,
		const char *	wgtVarName = `nullptr`
	)

Definition at line 95 of file RooTreeDataStore.cxx.

◆ RooTreeDataStore() [4/8]

RooTreeDataStore::RooTreeDataStore	(	RooStringView	name,
		RooStringView	title,
		const RooArgSet &	vars,
		TTree &	t,
		const char *	selExpr = `nullptr`,
		const char *	wgtVarName = `nullptr`
	)

Definition at line 106 of file RooTreeDataStore.cxx.

◆ RooTreeDataStore() [5/8]

RooTreeDataStore::RooTreeDataStore	(	RooStringView	name,
		RooStringView	title,
		const RooArgSet &	vars,
		const RooAbsDataStore &	tds,
		const char *	selExpr = `nullptr`,
		const char *	wgtVarName = `nullptr`
	)

Definition at line 125 of file RooTreeDataStore.cxx.

◆ RooTreeDataStore() [6/8]

RooTreeDataStore::RooTreeDataStore	(	RooStringView	name,
		RooStringView	title,
		RooAbsDataStore &	tds,
		const RooArgSet &	vars,
		const RooFormulaVar *	cutVar,
		const char *	cutRange,
		Int_t	nStart,
		Int_t	nStop,
		const char *	wgtVarName = `nullptr`
	)

Definition at line 146 of file RooTreeDataStore.cxx.

◆ RooTreeDataStore() [7/8]

RooTreeDataStore::RooTreeDataStore	(	const RooTreeDataStore &	other,
		const char *	newname = `nullptr`
	)

Definition at line 248 of file RooTreeDataStore.cxx.

◆ RooTreeDataStore() [8/8]

RooTreeDataStore::RooTreeDataStore	(	const RooTreeDataStore &	other,
		const RooArgSet &	vars,
		const char *	newname = `nullptr`
	)

Definition at line 268 of file RooTreeDataStore.cxx.

◆ ~RooTreeDataStore()

RooTreeDataStore::~RooTreeDataStore ( )

override

Destructor.

Definition at line 291 of file RooTreeDataStore.cxx.

Member Function Documentation

◆ addColumn()

RooAbsArg * RooTreeDataStore::addColumn	(	RooAbsArg &	newVar,
		bool	adjustRange = `true`
	)

overridevirtual

Add a new column to the data set which holds the pre-calculated values of 'newVar'.

This operation is only meaningful if 'newVar' is a derived value.

The return value points to the added element holding 'newVar's value in the data collection. The element is always the corresponding fundamental type of 'newVar' (e.g. a RooRealVar if 'newVar' is a RooFormulaVar)

Note: This function is explicitly NOT intended as a speed optimization opportunity for the user. Components of complex PDFs that can be precalculated with the dataset are automatically identified as such and will be precalculated when fitting to a dataset

By forcibly precalculating functions with non-trivial Jacobians, or functions of multiple variables occurring in the data set, using addColumn(), you may alter the outcome of the fit.

Only in cases where such a modification of fit behaviour is intentional, this function should be used.

Int_t RooTreeDataStore::GetEntry	(	Int_t	entry = `0`,
		Int_t	getall = `0`
	)

void RooTreeDataStore::loadValues	(	const TTree *	t,
		const RooFormulaVar *	select = `nullptr`,
		const char *	rangeName = `nullptr`,
		Int_t	nStart = `0`,
		Int_t	nStop = `2000000000`
	)

Public Member Functions

Static Public Member Functions

Private Member Functions

Private Attributes

Static Private Attributes

Friends

Additional Inherited Members

Constructor & Destructor Documentation

◆ RooTreeDataStore() [1/8]

◆ RooTreeDataStore() [2/8]

◆ RooTreeDataStore() [3/8]

◆ RooTreeDataStore() [4/8]

◆ RooTreeDataStore() [5/8]

◆ RooTreeDataStore() [6/8]

◆ RooTreeDataStore() [7/8]

◆ RooTreeDataStore() [8/8]

◆ ~RooTreeDataStore()

Member Function Documentation

◆ addColumn()

◆ append()

◆ attachBuffers()

◆ attachCache()

◆ cacheArgs()

◆ cacheOwner()

◆ changeObservableName()

◆ checkInit()

◆ Class()

◆ Class_Name()

◆ Class_Version()

◆ clone() [1/2]

◆ clone() [2/2]

◆ createTree()

◆ DeclFileName()

◆ Draw()

◆ Fill()

◆ fill()

◆ get() [1/3]

◆ get() [2/3]

◆ get() [3/3]

◆ getBatches()

◆ getBranchBufferSize()

◆ GetEntries()

◆ GetEntry()

◆ getWeightBatch()

◆ initialize()

◆ IsA()

◆ isWeighted()

◆ loadValues() [1/2]

◆ loadValues() [2/2]

◆ makeTreeName()

◆ merge()

◆ numEntries()

◆ reduce()

◆ reset()

◆ Reset()

◆ resetBuffers()

◆ resetCache()

◆ restoreAlternateBuffers()

◆ row()

◆ setArgStatus()

◆ setBranchBufferSize()

◆ setExternalWeightArray()

◆ Streamer()

◆ StreamerNVirtual()

◆ sumEntries()

◆ tree() [1/2]

◆ tree() [2/2]

◆ varsNoWeight()

◆ weight() [1/3]

◆ weight() [2/3]

◆ weight() [3/3]

◆ weightError() [1/2]

◆ weightError() [2/2]

◆ weightVar()

Friends And Related Symbol Documentation

◆ RooVectorDataStore

Member Data Documentation

◆ _attachedBuffers

◆ _cacheOwner

◆ _cacheTree