Multidimensional histogram.

Use a THn if you really, really have to store more than three dimensions, and if a large fraction of all bins are filled. Better alternatives are

THnSparse if a fraction of all bins are filled
TTree

The major problem of THn is the memory use caused by n-dimensional histogramming: a THnD with 8 dimensions and 100 bins per dimension needs more than 2.5GB of RAM!

To construct a THn object you must use one of its templated, derived classes:

THnD (typedef for THnT<Double_t>): bin content held by a Double_t,
THnF (typedef for THnT<Float_t>): bin content held by a Float_t,
THnL (typedef for THnT<Long_t>): bin content held by a Long_t,
THnI (typedef for THnT<Int_t>): bin content held by an Int_t,
THnS (typedef for THnT<Short_t>): bin content held by a Short_t,
THnC (typedef for THnT<Char_t>): bin content held by a Char_t,

They take name and title, the number of dimensions, and for each dimension the number of bins, the minimal, and the maximal value on the dimension's axis. A TH2F h("h","h",10, 0., 10., 20, -5., 5.) would correspond to

Int_t bins[2] = {10, 20};
Double_t xmin[2] = {0., -5.};
Double_t xmax[2] = {10., 5.};
THnF hn("hn", "hn", 2, bins, min, max);

Filling

A THn is filled just like a regular histogram, using THn::Fill(x, weight), where x is a n-dimensional Double_t value. To take errors into account, Sumw2() must be called before filling the histogram. Storage is allocated when the first bin content is stored.

Projections

The dimensionality of a THn can be reduced by projecting it to 1, 2, 3, or n dimensions, which can be represented by a TH1, TH2, TH3, or a THn. See the Projection() members. To only project parts of the histogram, call

hn->GetAxis(12)->SetRange(from_bin, to_bin);

Conversion from other histogram classes

The static factory function THn::CreateHn() can be used to create a THn from a TH1, TH2, TH3, THnSparse and (for copying) even from a THn. The created THn will have compatble storage type, i.e. calling CreateHn() on a TH2F will create a THnF.

Definition at line 48 of file THn.h.

Public Member Functions
virtual	~THn ()
	Destruct a THn. More...

ROOT::Internal::THnBaseBinIter *	CreateIter (Bool_t respectAxisRange) const
	Create an iterator over all bins. Public interface is THnIter. More...

Long64_t	GetNbins () const

Long64_t	GetBin (const Int_t *idx) const

Long64_t	GetBin (const Double_t *x) const

Long64_t	GetBin (const char *name[]) const

Long64_t	GetBin (const Int_t *idx, Bool_t=kTRUE)

Long64_t	GetBin (const Double_t *x, Bool_t=kTRUE)

Long64_t	GetBin (const char *name[], Bool_t=kTRUE)

void	SetBinContent (const Int_t *idx, Double_t v)

void	SetBinContent (Long64_t bin, Double_t v)

void	SetBinError2 (Long64_t bin, Double_t e2)

void	AddBinContent (const Int_t *idx, Double_t v=1.)

void	AddBinContent (Long64_t bin, Double_t v=1.)

void	AddBinError2 (Long64_t bin, Double_t e2)

Double_t	GetBinContent (const Int_t *idx) const

Double_t	GetBinContent (Long64_t bin, Int_t *idx=0) const

Double_t	GetBinError2 (Long64_t linidx) const

virtual const TNDArray &	GetArray () const =0

virtual TNDArray &	GetArray ()=0

void	Sumw2 ()
	Enable calculation of errors. More...

TH1D *	Projection (Int_t xDim, Option_t *option="") const

TH2D *	Projection (Int_t yDim, Int_t xDim, Option_t *option="") const

TH3D *	Projection (Int_t xDim, Int_t yDim, Int_t zDim, Option_t *option="") const

THn *	Projection (Int_t ndim, const Int_t dim, Option_t option="") const

THn *	Rebin (Int_t group) const

THn *	Rebin (const Int_t *group) const

void	Reset (Option_t *option="")
	Reset the contents of a THn. More...

Public Member Functions inherited from THnBase
virtual	~THnBase ()
	Destruct a THnBase. More...

TObjArray *	GetListOfAxes ()

const TObjArray *	GetListOfAxes () const

TAxis *	GetAxis (Int_t dim) const

TFitResultPtr	Fit (TF1 f1, Option_t option="", Option_t *goption="")
	Fit a THnSparse with function f. More...

TList *	GetListOfFunctions ()

Double_t	GetEntries () const

Double_t	GetWeightSum () const

Int_t	GetNdimensions () const

Bool_t	GetCalculateErrors () const

void	CalculateErrors (Bool_t calc=kTRUE)

Long64_t	Fill (const Double_t *x, Double_t w=1.)

Long64_t	Fill (const char *name[], Double_t w=1.)

void	SetBinEdges (Int_t idim, const Double_t *bins)
	Set the axis # of bins and bin limits on dimension idim. More...

Bool_t	IsInRange (Int_t *coord) const
	Check whether bin coord is in range, as defined by TAxis::SetRange(). More...

Double_t	GetBinError (const Int_t *idx) const

Double_t	GetBinError (Long64_t linidx) const

void	SetBinError (const Int_t *idx, Double_t e)

void	SetBinError (Long64_t bin, Double_t e)

void	AddBinContent (const Int_t *x, Double_t v=1.)

void	SetEntries (Double_t entries)

void	SetTitle (const char *title)
	Change (i.e. More...

Double_t	GetBinContent (const Int_t *idx) const

void	SetBinContent (const Int_t *idx, Double_t v)

Double_t	GetSumw () const

Double_t	GetSumw2 () const

Double_t	GetSumwx (Int_t dim) const

Double_t	GetSumwx2 (Int_t dim) const

TH1D *	Projection (Int_t xDim, Option_t *option="") const

TH2D *	Projection (Int_t yDim, Int_t xDim, Option_t *option="") const

TH3D *	Projection (Int_t xDim, Int_t yDim, Int_t zDim, Option_t *option="") const

THnBase *	ProjectionND (Int_t ndim, const Int_t dim, Option_t option="") const

Long64_t	Merge (TCollection *list)
	Merge this with a list of THnBase's. More...

void	Scale (Double_t c)
	Scale contents and errors of this histogram by c: this = this * c It does not modify the histogram's number of entries. More...

void	Add (const THnBase *h, Double_t c=1.)
	Add contents of h scaled by c to this histogram: this = this + c * h Note that if h has Sumw2 set, Sumw2 is automatically called for this if not already set. More...

void	Add (const TH1 *hist, Double_t c=1.)
	Fill the THnBase with the bins of hist that have content or error != 0. More...

void	Multiply (const THnBase *h)
	Multiply this histogram by histogram h this = this * h Note that if h has Sumw2 set, Sumw2 is automatically called for this if not already set. More...

void	Multiply (TF1 *f, Double_t c=1.)
	Performs the operation: this = thiscf1 if errors are defined, errors are also recalculated. More...

void	Divide (const THnBase *h)
	Divide this histogram by h this = this/(h) Note that if h has Sumw2 set, Sumw2 is automatically called for this if not already set. More...

void	Divide (const THnBase h1, const THnBase h2, Double_t c1=1., Double_t c2=1., Option_t *option="")
	Replace contents of this histogram by multiplication of h1 by h2 this = (c1h1)/(c2h2) Note that if h1 or h2 have Sumw2 set, Sumw2 is automatically called for this if not already set. More...

void	RebinnedAdd (const THnBase *h, Double_t c=1.)
	Add contents of h scaled by c to this histogram: this = this + c * h Note that if h has Sumw2 set, Sumw2 is automatically called for this if not already set. More...

Double_t	ComputeIntegral ()
	Calculate the integral of the histogram. More...

void	GetRandom (Double_t *rand, Bool_t subBinRandom=kTRUE)
	Generate an n-dimensional random tuple based on the histogrammed distribution. More...

void	Print (Option_t *option="") const
	Print a THnBase. More...

void	PrintEntries (Long64_t from=0, Long64_t howmany=-1, Option_t *options=0) const
	Print "howmany" entries starting at "from". More...

void	PrintBin (Int_t coord, Option_t options) const

void	PrintBin (Long64_t idx, Option_t *options) const
	Print bin with linex index "idx". More...

void	Browse (TBrowser *b)
	Browse a THnSparse: create an entry (ROOT::THnSparseBrowsable) for each dimension. More...

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

	ClassDef (THnBase, 1)

Public Member Functions inherited from TNamed
	TNamed ()

	TNamed (const char name, const char title)

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

	TNamed (const TNamed &named)

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

virtual	~TNamed ()

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

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

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

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

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

virtual const char *	GetName () const
	Returns name of object. More...

virtual const char *	GetTitle () const
	Returns title of object. More...

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

virtual Bool_t	IsSortable () const

virtual void	SetName (const char *name)
	Change (i.e. More...

virtual void	SetNameTitle (const char name, const char title)
	Change (i.e. set) all the TNamed parameters (name and title). More...

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

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

Public Member Functions inherited from TObject
	TObject ()

	TObject (const TObject &object)
	TObject copy ctor. More...

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

virtual	~TObject ()
	TObject destructor. More...

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

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

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

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

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

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

virtual TObject *	DrawClone (Option_t *option="") const
	Draw a clone of this object in the current pad. More...

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

virtual void	Execute (const char method, const char params, Int_t *error=0)
	Execute method on this object with the given parameter string, e.g. More...

virtual void	Execute (TMethod method, TObjArray params, Int_t *error=0)
	Execute method on this object with parameters stored in the TObjArray. More...

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

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

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

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

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

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

virtual Option_t *	GetOption () const

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

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

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

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

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

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

Bool_t	IsOnHeap () const

Bool_t	IsZombie () const

virtual Bool_t	Notify ()
	This method must be overridden to handle object notification. More...

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

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

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

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

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

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

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

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

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

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

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

void *	operator new (size_t sz)

void *	operator new[] (size_t sz)

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

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

void	operator delete (void *ptr)
	Operator delete. More...

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

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

void	SetBit (UInt_t f)

void	ResetBit (UInt_t f)

Bool_t	TestBit (UInt_t f) const

Int_t	TestBits (UInt_t f) const

void	InvertBit (UInt_t f)

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

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

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

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

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

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

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). More...

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

Static Public Member Functions
static THn *	CreateHn (const char name, const char title, const TH1 *h1)

static THn *	CreateHn (const char name, const char title, const THnBase *hn)

Static Public Member Functions inherited from TObject
static Long_t	GetDtorOnly ()
	Return destructor only flag. More...

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

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

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

Protected Member Functions
void	FillBin (Long64_t bin, Double_t w)

void	AllocCoordBuf () const
	Create the coordinate buffer. More...

void	InitStorage (Int_t *nbins, Int_t chunkSize)
	Initialize the storage of a histogram created via Init() More...

	THn ()

	THn (const char name, const char title, Int_t dim, const Int_t nbins, const Double_t xmin, const Double_t *xmax)
	Construct a THn. More...

	ClassDef (THn, 1)
	Temporary buffer. More...

Protected Member Functions inherited from THnBase
	THnBase ()

	THnBase (const char name, const char title, Int_t dim, const Int_t nbins, const Double_t xmin, const Double_t *xmax)
	Construct a THnBase with "dim" dimensions, "nbins" holds the number of bins for each dimension; "xmin" and "xmax" the minimal and maximal value for each dimension. More...

void	UpdateXStat (const Double_t *x, Double_t w=1.)

void	FillBinBase (Double_t w)

void	Init (const char name, const char title, const TObjArray axes, Bool_t keepTargetAxis, Int_t chunkSize=1024 16)
	Initialize axes and name. More...

THnBase *	CloneEmpty (const char name, const char title, const TObjArray *axes, Bool_t keepTargetAxis) const
	Create a new THnBase object that is of the same type as *this, but with dimensions and bins given by axes. More...

virtual void	Reserve (Long64_t)

virtual void	SetFilledBins (Long64_t)

Bool_t	CheckConsistency (const THnBase h, const char tag) const
	Consistency check on (some of) the parameters of two histograms (for operations). More...

TH1 *	CreateHist (const char name, const char title, const TObjArray *axes, Bool_t keepTargetAxis) const
	Create an empty histogram with name and title with a given set of axes. More...

TObject *	ProjectionAny (Int_t ndim, const Int_t dim, Bool_t wantNDim, Option_t option="") const
	Project all bins into a ndim-dimensional THn / THnSparse (whatever *this is) or if (ndim < 4 and !wantNDim) a TH1/2/3 histogram, keeping only axes in dim (specifying ndim dimensions). More...

Bool_t	PrintBin (Long64_t idx, Int_t coord, Option_t options) const
	Print one bin. More...

void	AddInternal (const THnBase *h, Double_t c, Bool_t rebinned)
	Add() implementation for both rebinned histograms and those with identical binning. More...

THnBase *	RebinBase (Int_t group) const
	Combine the content of "group" neighboring bins into a new bin and return the resulting THnBase. More...

THnBase *	RebinBase (const Int_t *group) const
	Combine the content of "group" neighboring bins for each dimension into a new bin and return the resulting THnBase. More...

void	ResetBase (Option_t *option="")
	Clear the histogram. More...

Protected Member Functions inherited from TObject
void	MakeZombie ()

virtual void	DoError (int level, const char location, const char fmt, va_list va) const
	Interface to ErrorHandler (protected). More...

Protected Attributes
TNDArrayT< Double_t >	fSumw2

Int_t *	fCoordBuf

Protected Attributes inherited from THnBase
Int_t	fNdimensions

TObjArray	fAxes

TObjArray	fBrowsables

Double_t	fEntries
	browser-helpers for each axis More...

Double_t	fTsumw

Double_t	fTsumw2

TArrayD	fTsumwx

TArrayD	fTsumwx2

Double_t *	fIntegral

enum THnBase:: { ... }	fIntegralStatus
	array with bin weight sums More...

Protected Attributes inherited from TNamed
TString	fName

TString	fTitle

Private Member Functions
	THn (const THn &)

THn &	operator= (const THn &)

Additional Inherited Members
Public Types inherited from TObject
enum	EStatusBits { kCanDelete = BIT(0), kMustCleanup = BIT(3), kObjInCanvas = BIT(3), kIsReferenced = BIT(4), kHasUUID = BIT(5), kCannotPick = BIT(6), kNoContextMenu = BIT(8), kInvalidObject = BIT(13) }

enum	{ kIsOnHeap = 0x01000000, kNotDeleted = 0x02000000, kZombie = 0x04000000, kBitMask = 0x00ffffff }

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

Protected Types inherited from THnBase
enum	{ kNoInt, kValidInt, kInvalidInt }
	array with bin weight sums More...

Static Protected Member Functions inherited from THnBase
static THnBase *	CreateHnAny (const char name, const char title, const TH1 h1, Bool_t sparse, Int_t chunkSize=1024 16)
	Create a THn / THnSparse object from a histogram deriving from TH1. More...

static THnBase *	CreateHnAny (const char name, const char title, const THnBase hn, Bool_t sparse, Int_t chunkSize=1024 16)
	Create a THnSparse (if "sparse") or THn from "hn", possibly converting THn <-> THnSparse. More...

#include <THn.h>

Inheritance diagram for THn:

Collaboration diagram for THn:

Constructor & Destructor Documentation

THn::THn ( const THn & )

private

THn::THn ( )

inlineprotected

Definition at line 67 of file THn.h.

THn::THn	(	const char *	name,
		const char *	title,
		Int_t	dim,
		const Int_t *	nbins,
		const Double_t *	xmin,
		const Double_t *	xmax
	)

protected

Construct a THn.

Definition at line 184 of file THn.cxx.

THn::~THn ( )

virtual

Destruct a THn.

Definition at line 195 of file THn.cxx.

Member Function Documentation

void THn::AddBinContent	(	const Int_t *	idx,
		Double_t	v = `1.`
	)

inline

Definition at line 124 of file THn.h.

void THn::AddBinContent	(	Long64_t	bin,
		Double_t	v = `1.`
	)

inlinevirtual

Implements THnBase.

Definition at line 129 of file THn.h.

void THn::AddBinError2	(	Long64_t	bin,
		Double_t	e2
	)

inlinevirtual

Implements THnBase.

Definition at line 132 of file THn.h.

void THn::AllocCoordBuf ( ) const

protected

Create the coordinate buffer.

Outlined to hide allocation from inlined functions.

Definition at line 229 of file THn.cxx.

Referenced by GetBin().

THn::ClassDef	(	THn	,
		1
	)

protected

Temporary buffer.

static THn* THn::CreateHn	(	const char *	name,
		const char *	title,
		const TH1 *	h1
	)

inlinestatic

Definition at line 74 of file THn.h.

static THn* THn::CreateHn	(	const char *	name,
		const char *	title,
		const THnBase *	hn
	)

inlinestatic

Definition at line 77 of file THn.h.

ROOT::Internal::THnBaseBinIter * THn::CreateIter ( Bool_t respectAxisRange ) const

virtual

Create an iterator over all bins. Public interface is THnIter.

Implements THnBase.

Definition at line 204 of file THn.cxx.

void THn::FillBin	(	Long64_t	bin,
		Double_t	w
	)

inlineprotectedvirtual

Implements THnBase.

Definition at line 54 of file THn.h.

virtual const TNDArray& THn::GetArray ( ) const

pure virtual

Implemented in THnT< T >.

Referenced by AddBinContent(), CreateIter(), FillBin(), GetBin(), GetBinContent(), GetNbins(), InitStorage(), Reset(), SetBinContent(), and Sumw2().

virtual TNDArray& THn::GetArray ( )

pure virtual

Implemented in THnT< T >.

Long64_t THn::GetBin ( const Int_t * idx ) const

inlinevirtual

Implements THnBase.

Definition at line 84 of file THn.h.

Referenced by GetBin().

Long64_t THn::GetBin ( const Double_t * x ) const

inlinevirtual

Implements THnBase.

Definition at line 87 of file THn.h.

Long64_t THn::GetBin ( const char * name[] ) const

inlinevirtual

Implements THnBase.

Definition at line 94 of file THn.h.

Long64_t THn::GetBin	(	const Int_t *	idx,
		Bool_t	= `kTRUE`
	)

inlinevirtual

Implements THnBase.

Definition at line 102 of file THn.h.

Long64_t THn::GetBin	(	const Double_t *	x,
		Bool_t	= `kTRUE`
	)

inlinevirtual

Implements THnBase.

Definition at line 105 of file THn.h.

Long64_t THn::GetBin	(	const char *	name[],
		Bool_t	= `kTRUE`
	)

inlinevirtual

Implements THnBase.

Definition at line 108 of file THn.h.

Double_t THn::GetBinContent ( const Int_t * idx ) const

inline

Definition at line 135 of file THn.h.

Referenced by GetBinError2().

Double_t THn::GetBinContent	(	Long64_t	bin,
		Int_t *	idx = `0`
	)		const

inlinevirtual

Implements THnBase.

Definition at line 140 of file THn.h.

Double_t THn::GetBinError2 ( Long64_t linidx ) const

inlinevirtual

Implements THnBase.

Definition at line 153 of file THn.h.

Long64_t THn::GetNbins ( ) const

inlinevirtual

Implements THnBase.

Definition at line 82 of file THn.h.

Referenced by Sumw2().

void THn::InitStorage	(	Int_t *	nbins,
		Int_t	chunkSize
	)

protectedvirtual

Initialize the storage of a histogram created via Init()

Implements THnBase.

Definition at line 237 of file THn.cxx.

THn& THn::operator= ( const THn & )

private

TH1D* THn::Projection	(	Int_t	xDim,
		Option_t *	option = `""`
	)		const

inline

Definition at line 162 of file THn.h.

TH2D* THn::Projection	(	Int_t	yDim,
		Int_t	xDim,
		Option_t *	option = `""`
	)		const

inline

Definition at line 169 of file THn.h.

TH3D* THn::Projection	(	Int_t	xDim,
		Int_t	yDim,
		Int_t	zDim,
		Option_t *	option = `""`
	)		const

inline

Definition at line 177 of file THn.h.

THn* THn::Projection	(	Int_t	ndim,
		const Int_t *	dim,
		Option_t *	option = `""`
	)		const

inline

Definition at line 185 of file THn.h.

THn* THn::Rebin ( Int_t group ) const

inline

Definition at line 190 of file THn.h.

THn* THn::Rebin ( const Int_t * group ) const

inline

Definition at line 193 of file THn.h.

void THn::Reset ( Option_t * option = "" )

virtual

Reset the contents of a THn.

Implements THnBase.

Definition at line 247 of file THn.cxx.

void THn::SetBinContent	(	const Int_t *	idx,
		Double_t	v
	)

inline

Definition at line 112 of file THn.h.

void THn::SetBinContent	(	Long64_t	bin,
		Double_t	v
	)

inlinevirtual

Implements THnBase.

Definition at line 117 of file THn.h.

void THn::SetBinError2	(	Long64_t	bin,
		Double_t	e2
	)

inlinevirtual

Implements THnBase.

Definition at line 120 of file THn.h.

void THn::Sumw2 ( )

virtual

Enable calculation of errors.

Implements THnBase.

Definition at line 213 of file THn.cxx.

Referenced by SetBinError2().

Member Data Documentation

Int_t* THn::fCoordBuf

mutableprotected

Definition at line 201 of file THn.h.

Referenced by AllocCoordBuf(), GetBin(), InitStorage(), and ~THn().

TNDArrayT<Double_t> THn::fSumw2

protected

Definition at line 200 of file THn.h.

Referenced by AddBinError2(), FillBin(), GetBinError2(), InitStorage(), Reset(), SetBinError2(), and Sumw2().

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

hist/hist/inc/THn.h
hist/hist/src/THn.cxx

Filling

Projections

Conversion from other histogram classes

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Private Member Functions

Additional Inherited Members

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation