TRatioPlot Class Reference

Class for displaying ratios, differences and fit residuals.

TRatioPlot has two constructors, one which accepts two histograms, and is responsible for setting up the calculation of ratios and differences. This calculation is in part delegated to TEfficiency. A single option can be given as a parameter, that is used to determine which procedure is chosen. The remaining option string is then passed through to the calculation, if applicable. The other constructor uses a fitted histogram to calculate the fit residual and plot it with the histogram and the fit function.

Ratios and differences

The simplest case is passing two histograms without specifying any options. This defaults to using TGraphAsymmErrors::Divide. The option variable is passed through, as are the parameters c1 and c2, that you can set via TRatioPlot::SetC1 and TRatioPlot::SetC1. If you set the option to divsym the method TH1::Divide will be used instead, also receiving all the parameters.

Using the option diff or diffsig, both histograms will be subtracted, and in the case of diffsig, the difference will be divided by the uncertainty. c1 and c2 will only be used to scale the histograms using TH1::Scale prior to subtraction.

Available options are for option:

Option	Description
divsym	uses the histogram TH1::Divide method, yields symmetric errors
diff	subtracts the histograms
diffsig	subtracts the histograms and divides by the uncertainty

 
void ratioplot1() {
   gStyle->SetOptStat(0);
   auto c1 = new TCanvas("c1", "A ratio example");
   auto h1 = new TH1D("h1", "h1", 50, 0, 10);
   auto h2 = new TH1D("h2", "h2", 50, 0, 10);
   auto f1 = new TF1("f1", "exp(- x/[0] )");
   f1->SetParameter(0, 3);
   h1->FillRandom("f1", 1900);
   h2->FillRandom("f1", 2000);
   h1->Sumw2();
   h2->Scale(1.9 / 2.);
   h1->GetXaxis()->SetTitle("x");
   h1->GetYaxis()->SetTitle("y");
   auto rp = new TRatioPlot(h1, h2);
   c1->SetTicks(0, 1);
   rp->Draw();
   rp->GetLowYaxis()->SetNdivisions(505);
   c1->Update();
}

Fit residuals

A second constructor only accepts a single histogram, but expects it to have a fitted function. The function is used to calculate the residual between the fit and the histogram. Here, it is expected that h1 has a fit function in it's list of functions. The class calculates the difference between the histogram and the fit function at each point and divides it by the uncertainty. There are a few option to steer which error is used (as is the case for diffsig). The default is to use the statistical uncertainty from h1 using TH1::GetBinError. If the option string contains errasym, asymmetric errors will be used. The type of error can be steered by TH1::SetBinErrorOption. The corresponding error will be used, depending on if the function is below or above the bin content. The third option errfunc uses the square root of the function value as the error.

 
void ratioplot2() {
   gStyle->SetOptStat(0);
   auto c1 = new TCanvas("c1", "fit residual simple");
   auto h1 = new TH1D("h1", "h1", 50, -5, 5);
   h1->FillRandom("gaus", 2000);
   h1->Fit("gaus");
   h1->GetXaxis()->SetTitle("x");
   c1->Clear(); // Fit does not draw into correct pad
   auto rp1 = new TRatioPlot(h1);
   rp1->Draw();
   rp1->GetLowerRefYaxis()->SetTitle("ratio");
   rp1->GetUpperRefYaxis()->SetTitle("entries");
   c1->Update();
}

Error options for difference divided by uncertainty and fit residual

The uncertainty that is used in the calculation can be steered by providing options to the option argument.

Option	Description
errasym	Uses calculated asymmetric errors from TH1::GetBinErrorUp/TH1::GetBinErrorLow. Note that you need to set TH1::SetBinErrorOption first
errfunc	Uses $\sqrt{f(x)}$ as the error

The asymmetric error case uses the upper or lower error depending on the relative size of the bin contents, or the bin content and the function value.

Access to internal parts

You can access the internal objects that are used to construct the plot via a series of methods. TRatioPlot::GetUpperPad and TRatioPlot::GetLowerPad can be used to draw additional elements on top of the existing ones. TRatioPlot::GetLowerRefGraph returns a reference to the lower pad's graph that is responsible for the range, which enables you to modify the range.

Definition at line 44 of file TRatioPlot.h.

Public Member Functions
	TRatioPlot ()
	TRatioPlot default constructor. More...
	TRatioPlot (TH1 *h1, Option_t *option="", TFitResult *fitres=0)
	Constructor for one histogram and a fit. More...
	TRatioPlot (TH1 *h1, TH1 *h2, Option_t *option="pois")
	Constructor for two histograms. More...
	TRatioPlot (THStack *st, TH1 *h2, Option_t *option="pois")
	Constructor which accepts a THStack and a histogram. More...
virtual	~TRatioPlot ()
	Destructor. More...
virtual void	Browse (TBrowser *b)
	Browse. More...
virtual void	Draw (Option_t *chopt="")
	Draws the ratio plot to the currently active pad. More...
TGraph *	GetCalculationOutputGraph () const
	Get the output of the calculation in the form of a graph. More...
TGraphErrors *	GetConfidenceInterval1 () const
	Returns the graph for the 1 sigma confidence interval in the fit residual case. More...
TGraphErrors *	GetConfidenceInterval2 () const
	Returns the graph for the 2 sigma confidence interval in the fit residual case. More...
TPad *	GetLowerPad () const
virtual TGraph *	GetLowerRefGraph () const
	Returns the reference graph for the lower pad, which means the graph that is responsible for setting the coordinate system. More...
TAxis *	GetLowerRefXaxis () const
	Shortcut for: More...
TAxis *	GetLowerRefYaxis () const
	Shortcut for: More...
TAxis *	GetLowYaxis () const
Float_t	GetSeparationMargin () const
	Return the separation margin value. More...
TPad *	GetUpperPad () const
virtual TObject *	GetUpperRefObject () const
	Return the reference object. More...
TAxis *	GetUpperRefXaxis () const
	Gets the x axis of the object returned by TRatioPlot::GetUpperRefObject. More...
TAxis *	GetUpperRefYaxis () const
	Gets the y axis of the object returned by TRatioPlot::GetUpperRefObject. More...
TAxis *	GetUpYaxis () const
TAxis *	GetXaxis () const
virtual void	Paint (Option_t *opt="")
	Creates the visual axes when painting. More...
void	RangeAxisChanged ()
	Slot that receives the RangeAxisChanged signal from any of the pads and reacts correspondingly. More...
void	SetC1 (Double_t c1)
void	SetC2 (Double_t c2)
void	SetConfidenceIntervalColors (Color_t ci1=kGreen, Color_t ci2=kYellow)
	Set the confidence interval colors. More...
void	SetConfidenceLevels (Double_t cl1, Double_t cl2)
	Sets the confidence levels used to calculate the bands in the fit residual case. More...
void	SetFitDrawOpt (Option_t *opt)
	Sets the drawing option for the fit in the fit residual case. More...
void	SetFitResult (TFitResultPtr fitres)
	Explicitly specify the fit result that is to be used for fit residual calculation. More...
void	SetGraphDrawOpt (Option_t *opt)
	Sets the drawing option for the lower graph. More...
virtual void	SetGridlines (Double_t *gridlines, Int_t numGridlines)
	Set where horizontal, dashed lines are drawn on the lower pad. More...
virtual void	SetGridlines (std::vector< double > gridlines)
	Set where horizontal, dashed lines are drawn on the lower pad. More...
void	SetH1DrawOpt (Option_t *opt)
	Sets the drawing option for h1. More...
void	SetH2DrawOpt (Option_t *opt)
	Sets the drawing option for h2. More...
void	SetInsetWidth (Double_t width)
	Set the inset on the outer sides of all the pads. More...
void	SetLeftMargin (Float_t margin)
	Sets the left margin of both pads. More...
void	SetLowBottomMargin (Float_t margin)
	Sets the bottom margin of the lower pad. More...
void	SetLowTopMargin (Float_t margin)
	Sets the top margin of the lower pad. More...
void	SetRightMargin (Float_t margin)
	Sets the right margin of both pads. More...
void	SetSeparationMargin (Float_t)
	Sets the margin that separates the two pads. More...
void	SetSplitFraction (Float_t sf)
	Set the fraction of the parent pad, at which the to sub pads should meet. More...
void	SetUpBottomMargin (Float_t margin)
	Sets the bottom margin of the upper pad. More...
void	SetUpTopMargin (Float_t margin)
	Sets the top margin of the upper pad. More...
void	SubPadResized ()
	Slot that handles common resizing of upper and lower pad. More...
void	UnZoomed ()
	Slot for the UnZoomed signal that was introduced to TAxis. More...
Public Member Functions inherited from TObject
	TObject ()
	TObject constructor. More...
	TObject (const TObject &object)
	TObject copy ctor. More...
virtual	~TObject ()
	TObject destructor. 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...
virtual void	AppendPad (Option_t *option="")
	Append graphics object to current pad. More...
virtual void	Browse (TBrowser *b)
	Browse object. May be overridden for another default action. More...
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. More...
virtual const char *	ClassName () const
	Returns name of class to which the object belongs. More...
virtual void	Clear (Option_t *="")
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 abstract method. More...
virtual void	Copy (TObject &object) const
	Copy this to obj. 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 selected pad for instance with: gROOT->SetSelectedPad(gPad). More...
virtual void	Dump () const
	Dump contents of object on stdout. More...
virtual void	Error (const char *method, const char *msgfmt,...) const
	Issue error message. 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 void	Fatal (const char *method, const char *msgfmt,...) const
	Issue fatal error message. 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 const char *	GetIconName () const
	Returns mime type name of object. More...
virtual const char *	GetName () const
	Returns name of object. More...
virtual char *	GetObjectInfo (Int_t px, Int_t py) const
	Returns string containing info about the object at position (px,py). More...
virtual Option_t *	GetOption () const
virtual const char *	GetTitle () const
	Returns title of object. More...
virtual UInt_t	GetUniqueID () const
	Return the unique object id. More...
virtual Bool_t	HandleTimer (TTimer *timer)
	Execute action in response of a timer timing out. More...
virtual ULong_t	Hash () const
	Return hash value for this object. More...
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. More...
virtual void	Info (const char *method, const char *msgfmt,...) const
	Issue info message. 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...
void	InvertBit (UInt_t f)
virtual Bool_t	IsEqual (const TObject *obj) const
	Default equal comparison (objects are equal if they have the same address in memory). More...
virtual Bool_t	IsFolder () const
	Returns kTRUE in case object contains browsable objects (like containers or lists of other objects). More...
R__ALWAYS_INLINE Bool_t	IsOnHeap () const
virtual Bool_t	IsSortable () const
R__ALWAYS_INLINE Bool_t	IsZombie () const
virtual void	ls (Option_t *option="") const
	The ls function lists the contents of a class on stdout. 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...
virtual Bool_t	Notify ()
	This method must be overridden to handle object notification. More...
void	Obsolete (const char *method, const char *asOfVers, const char *removedFromVers) const
	Use this method to declare a method obsolete. More...
void	operator delete (void *ptr)
	Operator delete. More...
void	operator delete[] (void *ptr)
	Operator delete []. More...
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. 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 void	Print (Option_t *option="") const
	This method must be overridden when a class wants to print itself. 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...
void	ResetBit (UInt_t f)
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...
void	SetBit (UInt_t f)
void	SetBit (UInt_t f, Bool_t set)
	Set or unset the user status bits as specified in f. 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	SysError (const char *method, const char *msgfmt,...) const
	Issue system error message. More...
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. More...
virtual void	Warning (const char *method, const char *msgfmt,...) const
	Issue warning message. 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...

Protected Member Functions
Int_t	BuildLowerPlot ()
	Build the lower plot according to which constructor was called, and which options were passed. More...
void	CreateGridline ()
	Create a grid line. More...
virtual void	CreateVisualAxes ()
	(Re-)Creates the TGAxis objects that are used for consistent display of the axes. More...
void	ImportAxisAttributes (TGaxis *gaxis, TAxis *axis)
	Internal method to import TAxis attributes to a TGaxis. More...
virtual void	Init (TH1 *h1, TH1 *h2, Option_t *option="")
	Internal method that shares constructor logic. More...
Bool_t	IsDrawn ()
	Check if ... is drawn. More...
void	SetPadMargins ()
	Sets the margins of all the pads to the value specified in class members. More...
virtual void	SetupPads ()
	Setup the pads. More...
virtual void	SyncAxesRanges ()
	Syncs the axes ranges from the shared ones to the actual ones. More...
virtual Bool_t	SyncPadMargins ()
	Figures out which pad margin has deviated from the stored ones, to figure out what the new nominal is and set the other pad to it subsequently. More...
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). More...
void	MakeZombie ()

Protected Attributes
Double_t	fC1 = 1.
	Stores the scale factor for h1 (or THStack sum) More...
Double_t	fC2 = 1.
	Stores the scale factor for h2. More...
Color_t	fCi1Color = kGreen
	Stores the color for the 1 sigma band. More...
Color_t	fCi2Color = kYellow
	Stores the color for the 2 sigma band. More...
Double_t	fCl1 = 0.6827
	Stores the confidence level for the inner confidence interval band. More...
Double_t	fCl2 = 0.9545
	Stores the confidence level for the outer confidence interval band. More...
TGraphErrors *	fConfidenceInterval1 = 0
	Stores the graph for the 1 sigma band. More...
TGraphErrors *	fConfidenceInterval2 = 0
	Stores the graph for the 2 sigma band. More...
Int_t	fErrorMode = TRatioPlot::ErrorMode::kErrorSymmetric
	Stores the error mode, sym, asym or func. More...
TString	fFitDrawOpt = ""
	Stores draw option for the fit function in the fit residual case. More...
TFitResult *	fFitResult = 0
	Stores the explicit fit result given in the fit residual case. Can be 0. More...
TString	fGraphDrawOpt = ""
	Stores draw option for the lower plot graph given in constructor. More...
std::vector< double >	fGridlinePositions
	Stores the y positions for the gridlines. More...
std::vector< TLine * >	fGridlines
	Keeps TLine objects for the gridlines. More...
TH1 *	fH1 = 0
	Stores the primary histogram. More...
TString	fH1DrawOpt = ""
	Stores draw option for h1 given in constructor. More...
TH1 *	fH2 = 0
	Stores the secondary histogram, if there is one. More...
TString	fH2DrawOpt = ""
	Stores draw option for h2 given in constructor. More...
Int_t	fHideLabelMode = TRatioPlot::HideLabelMode::kHideLow
	Stores which label to hide if the margin is to narrow, if at all. More...
TObject *	fHistDrawProxy = 0
	The object which is actually drawn, this might be TH1 or THStack. More...
Float_t	fInsetWidth = 0.0025
Bool_t	fIsPadUpdating = kFALSE
	Keeps track whether pads are updating during resizing. More...
Bool_t	fIsUpdating = kFALSE
	Keeps track of whether its currently updating to reject other calls until done. More...
Float_t	fLeftMargin = 0.1
	Stores the common left margin of both pads. More...
Float_t	fLowBottomMargin = 0.3
	Stores the bottom margin of the lower pad. More...
TGaxis *	fLowerGXaxis = 0
	Lower graphical x axis. More...
TGaxis *	fLowerGXaxisMirror = 0
	Lower mirror of the x axis. More...
TGaxis *	fLowerGYaxis = 0
	Lower graphical y axis. More...
TGaxis *	fLowerGYaxisMirror = 0
	Lower mirror of the y axis. More...
TPad *	fLowerPad = 0
	The pad which contains the calculated lower plot part. More...
Float_t	fLowTopMargin = 0.05
	Stores the top margin of the lower pad. More...
TAxis *	fLowYaxis = 0
	Clone of the lower y axis. More...
Int_t	fMode = 0
	Stores which calculation is supposed to be performed as specified by user option. More...
TString	fOption = ""
	Stores the option which is given in the constructor as a string. More...
TVirtualPad *	fParentPad = 0
	Stores the pad the ratio plot was created in. More...
TGraph *	fRatioGraph = 0
	Stores the lower plot's graph. More...
Float_t	fRightMargin = 0.1
	Stores the common right margin of both pads. More...
TAxis *	fSharedXAxis = 0
	X axis that stores the range for both plots. More...
Bool_t	fShowConfidenceIntervals = kTRUE
	Stores whether to show the confidence interval bands. From Draw option. More...
Bool_t	fShowGridlines = kTRUE
	Stores whether to show the gridlines at all. More...
Float_t	fSplitFraction = 0.3
	Stores the fraction at which the upper and lower pads meet. More...
TPad *	fTopPad = 0
	The Pad that drawn on top on the others to have consistent coordinates. More...
Float_t	fUpBottomMargin = 0.05
	Stores the bottom margin of the upper pad. More...
TGaxis *	fUpperGXaxis = 0
	Upper graphical x axis. More...
TGaxis *	fUpperGXaxisMirror = 0
	Upper mirror of the x axis. More...
TGaxis *	fUpperGYaxis = 0
	Upper graphical y axis. More...
TGaxis *	fUpperGYaxisMirror = 0
	Upper mirror of the y axis. More...
TPad *	fUpperPad = 0
	The pad which contains the upper plot part. More...
Float_t	fUpTopMargin = 0.1
	Stores the top margin of the upper pad. More...
TAxis *	fUpYaxis = 0
	Clone of the upper y axis. More...

Private Types
enum	CalculationMode {   kDivideHist = 1 , kDivideGraph = 2 , kDifference = 3 , kFitResidual = 4 ,   kDifferenceSign = 5 }
enum	ErrorMode { kErrorSymmetric = 1 , kErrorAsymmetric = 2 , kErrorFunc = 3 }
enum	HideLabelMode {   kHideUp = 1 , kHideLow = 2 , kNoHide = 3 , kForceHideUp = 4 ,   kForceHideLow = 5 }

Private Member Functions
	TRatioPlot (const TRatioPlot &hrp)=delete
TRatioPlot &	operator= (const TRatioPlot &)=delete

Additional Inherited Members
Public Types inherited from TObject
enum	{   kIsOnHeap = 0x01000000 , kNotDeleted = 0x02000000 , kZombie = 0x04000000 , kInconsistent = 0x08000000 ,   kBitMask = 0x00ffffff }
enum	{ kSingleKey = BIT(0) , kOverwrite = BIT(1) , kWriteDelete = BIT(2) }
enum	EDeprecatedStatusBits { kObjInCanvas = BIT(3) }
enum	EStatusBits {   kCanDelete = BIT(0) , kMustCleanup = BIT(3) , kIsReferenced = BIT(4) , kHasUUID = BIT(5) ,   kCannotPick = BIT(6) , kNoContextMenu = BIT(8) , kInvalidObject = BIT(13) }
Static Public Member Functions inherited from TObject
static Long_t	GetDtorOnly ()
	Return destructor only flag. More...
static Bool_t	GetObjectStat ()
	Get status of object stat flag. More...
static void	SetDtorOnly (void *obj)
	Set destructor only flag. More...
static void	SetObjectStat (Bool_t stat)
	Turn on/off tracking of objects in the TObjectTable. More...

#include <TRatioPlot.h>

Inheritance diagram for TRatioPlot:

Member Enumeration Documentation

CalculationMode

enum TRatioPlot::CalculationMode

private

Enumerator
kDivideHist	Use TH1::Divide to create the ratio.
kDivideGraph	Use TGraphAsymmErrors::Divide to create the ratio.
kDifference	Calculate the difference between the histograms.
kFitResidual	Calculate the fit residual between the histogram and a fit stored within it.
kDifferenceSign	Calculate the difference divided by the error.

Definition at line 50 of file TRatioPlot.h.

ErrorMode

enum TRatioPlot::ErrorMode

private

Enumerator
kErrorSymmetric	Use the regular TH1::GetBinError as the error.
kErrorAsymmetric	Use TH1::GetBinErrorUp and TH1::GetBinErrorLow for the error, depending on y values.
kErrorFunc	Use the square root of the function value as the error.

Definition at line 58 of file TRatioPlot.h.

HideLabelMode

enum TRatioPlot::HideLabelMode

private

Enumerator
kHideUp	Hide the first label of the upper y axis when there is low space.
kHideLow	Hide the last label of the lower y axis when there is low space.
kNoHide	Do not hide labels when there is low space.
kForceHideUp	Always hide the first label of the upper y axis.
kForceHideLow	Always hide the last label of the lower y axis.

Definition at line 64 of file TRatioPlot.h.

Constructor & Destructor Documentation

TRatioPlot() [1/5]

TRatioPlot::TRatioPlot ( const TRatioPlot &  hrp )

privatedelete

TRatioPlot() [2/5]

TRatioPlot::TRatioPlot

(

)

TRatioPlot default constructor.

Definition at line 122 of file TRatioPlot.cxx.

~TRatioPlot()

TRatioPlot::~TRatioPlot ( )

virtual

Destructor.

Definition at line 129 of file TRatioPlot.cxx.

TRatioPlot() [3/5]

TRatioPlot::TRatioPlot	(	TH1 *	h1,
		TH1 *	h2,
		Option_t *	option = "pois"
	)

Constructor for two histograms.

Parameters

h1	First histogram
h2	Second histogram
option	Steers the error calculation, as well as ratio / difference

Definition at line 218 of file TRatioPlot.cxx.

TRatioPlot() [4/5]

TRatioPlot::TRatioPlot	(	THStack *	st,
		TH1 *	h2,
		Option_t *	option = "pois"
	)

Constructor which accepts a THStack and a histogram.

Converts the stack to a regular sum of its containing histograms for processing.

Parameters

st	The THStack object
h2	The other histogram
option	Steers the calculation of the lower plot

Definition at line 250 of file TRatioPlot.cxx.

TRatioPlot() [5/5]

TRatioPlot::TRatioPlot	(	TH1 *	h1,
		Option_t *	option = "",
		TFitResult *	fitres = 0
	)

Constructor for one histogram and a fit.

Parameters

h1	The histogram
option	Steers the error calculation
fitres	Explicit fit result to be used for calculation. Uses last fit if left empty

Definition at line 284 of file TRatioPlot.cxx.

Member Function Documentation

Browse()

void TRatioPlot::Browse ( TBrowser *  b )

virtual

Browse.

Reimplemented from TObject.

Definition at line 443 of file TRatioPlot.cxx.

BuildLowerPlot()

Int_t TRatioPlot::BuildLowerPlot ( )

protected

Build the lower plot according to which constructor was called, and which options were passed.

Definition at line 880 of file TRatioPlot.cxx.

CreateGridline()

void TRatioPlot::CreateGridline ( )

protected

Create a grid line.

Definition at line 777 of file TRatioPlot.cxx.

CreateVisualAxes()

void TRatioPlot::CreateVisualAxes ( )

protectedvirtual

(Re-)Creates the TGAxis objects that are used for consistent display of the axes.

Definition at line 1125 of file TRatioPlot.cxx.

Draw()

void TRatioPlot::Draw ( Option_t *  option = "" )

virtual

Draws the ratio plot to the currently active pad.

Therefore it requires that a TCanvas has been created first.

It takes the following options

Option	Description
grid / nogrid	enable (default) or disable drawing of dashed lines on lower plot
hideup	hides the first label of the upper axis if there is not enough space
fhideup	always hides the first label of the upper axis
hidelow (default)	hides the last label of the lower axis if there is not enough space
fhidelow	always hides the last label of the lower axis
nohide	does not hide a label if there is not enough space
noconfint	does not draw the confidence interval bands in the fit residual case
confint	draws the confidence interval bands in the fit residual case (default)

Reimplemented from TObject.

Definition at line 560 of file TRatioPlot.cxx.

GetCalculationOutputGraph()

TGraph * TRatioPlot::GetCalculationOutputGraph ( ) const

inline

Get the output of the calculation in the form of a graph.

The type of the return value depends on the input option that was given in the constructor.

Definition at line 218 of file TRatioPlot.h.

GetConfidenceInterval1()

TGraphErrors * TRatioPlot::GetConfidenceInterval1 ( ) const

inline

Returns the graph for the 1 sigma confidence interval in the fit residual case.

Definition at line 223 of file TRatioPlot.h.

GetConfidenceInterval2()

TGraphErrors * TRatioPlot::GetConfidenceInterval2 ( ) const

inline

Returns the graph for the 2 sigma confidence interval in the fit residual case.

Definition at line 228 of file TRatioPlot.h.

GetLowerPad()

TPad * TRatioPlot::GetLowerPad ( ) const

inline

Definition at line 231 of file TRatioPlot.h.

GetLowerRefGraph()

TGraph * TRatioPlot::GetLowerRefGraph ( ) const

virtual

Returns the reference graph for the lower pad, which means the graph that is responsible for setting the coordinate system.

It is the first graph added to the primitive list of the lower pad. This reference can be used to set the minimum and maximum of the lower pad. Note that TRatioPlot::Draw needs to have been called first, since the graphs are only created then.

 
void ratioplot3()  {
    gStyle->SetOptStat(0);
    auto c1 = new TCanvas("c1", "fit residual simple");
    c1->SetLogy();
    auto h1 = new TH1D("h1", "h1", 50, -5, 5);
    h1->FillRandom("gaus", 2000);
    h1->Fit("gaus");
    h1->SetMinimum(0.001);
    h1->GetXaxis()->SetTitle("x");
    h1->GetYaxis()->SetTitle("y");
    c1->Clear();
    auto rp1 = new TRatioPlot(h1);
    rp1->Draw();
    rp1->GetLowerRefGraph()->SetMinimum(-2);
    rp1->GetLowerRefGraph()->SetMaximum(2);
    c1->Update();
}

Definition at line 689 of file TRatioPlot.cxx.

GetLowerRefXaxis()

TAxis * TRatioPlot::GetLowerRefXaxis ( ) const

inline

Shortcut for:

rp->GetLowerRefGraph()->GetXaxis();

Definition at line 199 of file TRatioPlot.h.

GetLowerRefYaxis()

TAxis * TRatioPlot::GetLowerRefYaxis ( ) const

inline

Shortcut for:

rp->GetLowerRefGraph()->GetYaxis();

Definition at line 208 of file TRatioPlot.h.

GetLowYaxis()

TAxis * TRatioPlot::GetLowYaxis ( ) const

inline

Definition at line 188 of file TRatioPlot.h.

GetSeparationMargin()

Float_t TRatioPlot::GetSeparationMargin

(

)

const

Return the separation margin value.

Definition at line 535 of file TRatioPlot.cxx.

GetUpperPad()

TPad * TRatioPlot::GetUpperPad ( ) const

inline

Definition at line 230 of file TRatioPlot.h.

GetUpperRefObject()

TObject * TRatioPlot::GetUpperRefObject ( ) const

virtual

Return the reference object.

Its the first TH1 or THStack type object in the upper pads list of primitives. Note that it returns a TObject, so you need to test and cast it to use it.

Definition at line 723 of file TRatioPlot.cxx.

GetUpperRefXaxis()

TAxis * TRatioPlot::GetUpperRefXaxis

(

)

const

Gets the x axis of the object returned by TRatioPlot::GetUpperRefObject.

Definition at line 741 of file TRatioPlot.cxx.

GetUpperRefYaxis()

TAxis * TRatioPlot::GetUpperRefYaxis

(

)

const

Gets the y axis of the object returned by TRatioPlot::GetUpperRefObject.

Definition at line 759 of file TRatioPlot.cxx.

GetUpYaxis()

TAxis * TRatioPlot::GetUpYaxis ( ) const

inline

Definition at line 187 of file TRatioPlot.h.

GetXaxis()

TAxis * TRatioPlot::GetXaxis ( ) const

inline

Definition at line 186 of file TRatioPlot.h.

ImportAxisAttributes()

void TRatioPlot::ImportAxisAttributes ( TGaxis *  gaxis, TAxis *  axis  )

protected

Internal method to import TAxis attributes to a TGaxis.

Copied from TGaxis::ImportAxisAttributes

Definition at line 1735 of file TRatioPlot.cxx.

Init()

void TRatioPlot::Init ( TH1 *  h1, TH1 *  h2, Option_t *  option = ""  )

protectedvirtual

Internal method that shares constructor logic.

Definition at line 160 of file TRatioPlot.cxx.

IsDrawn()

Bool_t TRatioPlot::IsDrawn ( )

protected

Check if ... is drawn.

Definition at line 1626 of file TRatioPlot.cxx.

operator=()

TRatioPlot & TRatioPlot::operator= ( const TRatioPlot &  )

privatedelete

Paint()

void TRatioPlot::Paint ( Option_t *  opt = "" )

virtual

Creates the visual axes when painting.

Reimplemented from TObject.

Definition at line 848 of file TRatioPlot.cxx.

RangeAxisChanged()

void TRatioPlot::RangeAxisChanged

(

)

Slot that receives the RangeAxisChanged signal from any of the pads and reacts correspondingly.

Definition at line 1486 of file TRatioPlot.cxx.

SetC1()

void TRatioPlot::SetC1 ( Double_t  c1 )

inline

Definition at line 262 of file TRatioPlot.h.

SetC2()

void TRatioPlot::SetC2 ( Double_t  c2 )

inline

Definition at line 263 of file TRatioPlot.h.

SetConfidenceIntervalColors()

void TRatioPlot::SetConfidenceIntervalColors	(	Color_t	ci1 = kGreen,
		Color_t	ci2 = kYellow
	)

Set the confidence interval colors.

Parameters

ci1	Color of the 1 sigma band
ci2	Color of the 2 sigma band Sets the color of the 1 and 2 sigma bands in the fit residual case.

 
void ratioplot5()  {
   gStyle->SetOptStat(0);
   auto c1 = new TCanvas("c1", "fit residual simple");
   auto h1 = new TH1D("h1", "h1", 50, -5, 5);
   h1->FillRandom("gaus", 2000);
   h1->Fit("gaus");
   h1->GetXaxis()->SetTitle("x");
   h1->GetYaxis()->SetTitle("y");
   c1->Clear();
   auto rp1 = new TRatioPlot(h1);
   rp1->SetConfidenceIntervalColors(kBlue, kRed);
   rp1->Draw();
   c1->Update();
}

Definition at line 1725 of file TRatioPlot.cxx.

SetConfidenceLevels()

void TRatioPlot::SetConfidenceLevels	(	Double_t	c1,
		Double_t	c2
	)

Sets the confidence levels used to calculate the bands in the fit residual case.

Defaults to 1 and 2 sigma.

Definition at line 1677 of file TRatioPlot.cxx.

SetFitDrawOpt()

void TRatioPlot::SetFitDrawOpt

(

Option_t *

opt

)

Sets the drawing option for the fit in the fit residual case.

Definition at line 382 of file TRatioPlot.cxx.

SetFitResult()

void TRatioPlot::SetFitResult ( TFitResultPtr  fitres )

inline

Explicitly specify the fit result that is to be used for fit residual calculation.

If it is not provided, the last fit registered in the global fitter is used. The fit result can also be specified in the constructor.

Parameters

fitres

The fit result coming from the fit function call

Definition at line 242 of file TRatioPlot.h.

SetGraphDrawOpt()

void TRatioPlot::SetGraphDrawOpt

(

Option_t *

opt

)

Sets the drawing option for the lower graph.

Definition at line 374 of file TRatioPlot.cxx.

SetGridlines() [1/2]

void TRatioPlot::SetGridlines ( Double_t *  gridlines, Int_t  numGridlines  )

virtual

Set where horizontal, dashed lines are drawn on the lower pad.

Can be used to override existing default lines (or disable them).

Parameters

gridlines	Double_t array of y positions for the dashed lines
numGridlines	Length of gridlines

Definition at line 1706 of file TRatioPlot.cxx.

SetGridlines() [2/2]

void TRatioPlot::SetGridlines ( std::vector< double >  gridlines )

virtual

Set where horizontal, dashed lines are drawn on the lower pad.

Can be used to override existing default lines (or disable them).

Parameters

gridlines

Vector of y positions for the dashes lines

 
void ratioplot4()  {
   gStyle->SetOptStat(0);
   auto c1 = new TCanvas("c1", "fit residual simple");
   auto h1 = new TH1D("h1", "h1", 50, -5, 5);
   h1->FillRandom("gaus", 2000);
   h1->Fit("gaus");
   h1->GetXaxis()->SetTitle("x");
   h1->GetYaxis()->SetTitle("y");
   c1->Clear();
   auto rp1 = new TRatioPlot(h1);
   std::vector<double> lines = {-3, -2, -1, 0, 1, 2, 3};
   rp1->SetGridlines(lines);
   rp1->Draw();
   rp1->GetLowerRefGraph()->SetMinimum(-4);
   rp1->GetLowerRefGraph()->SetMaximum(4);
   c1->Update();
}

Definition at line 1694 of file TRatioPlot.cxx.

SetH1DrawOpt()

void TRatioPlot::SetH1DrawOpt

(

Option_t *

opt

)

Sets the drawing option for h1.

Definition at line 354 of file TRatioPlot.cxx.

SetH2DrawOpt()

void TRatioPlot::SetH2DrawOpt

(

Option_t *

opt

)

Sets the drawing option for h2.

Definition at line 362 of file TRatioPlot.cxx.

SetInsetWidth()

void TRatioPlot::SetInsetWidth

(

Double_t

width

)

Set the inset on the outer sides of all the pads.

It's used to make the outer pad draggable.

Definition at line 1656 of file TRatioPlot.cxx.

SetLeftMargin()

void TRatioPlot::SetLeftMargin

(

Float_t

margin

)

Sets the left margin of both pads.

Parameters

margin

The new margin

Definition at line 497 of file TRatioPlot.cxx.

SetLowBottomMargin()

void TRatioPlot::SetLowBottomMargin

(

Float_t

margin

)

Sets the bottom margin of the lower pad.

Parameters

margin

The new margin

Definition at line 487 of file TRatioPlot.cxx.

SetLowTopMargin()

void TRatioPlot::SetLowTopMargin

(

Float_t

margin

)

Sets the top margin of the lower pad.

Parameters

margin

The new margin

Definition at line 476 of file TRatioPlot.cxx.

SetPadMargins()

void TRatioPlot::SetPadMargins ( )

protected

Sets the margins of all the pads to the value specified in class members.

This one is called whenever those are changed, e.g. in setters

Definition at line 1400 of file TRatioPlot.cxx.

SetRightMargin()

void TRatioPlot::SetRightMargin

(

Float_t

margin

)

Sets the right margin of both pads.

Parameters

margin

The new margin

Definition at line 508 of file TRatioPlot.cxx.

SetSeparationMargin()

void TRatioPlot::SetSeparationMargin

(

Float_t

margin

)

Sets the margin that separates the two pads.

The margin is split according to the relative sizes of the pads

Parameters

margin

The new margin

 
void ratioplot6() {
   gStyle->SetOptStat(0);
   auto c1 = new TCanvas("c1", "fit residual simple");
   gPad->SetFrameFillStyle(0);
   auto h1 = new TH1D("h1", "h1", 50, -5, 5);
   h1->FillRandom("gaus", 5000);
   TFitResultPtr fitres = h1->Fit("gaus", "S");
   h1->Sumw2();
   h1->GetXaxis()->SetTitle("x");
   h1->GetYaxis()->SetTitle("y");
 
   c1->Clear();
 
   auto rp1 = new TRatioPlot(h1, "errfunc");
   rp1->SetGraphDrawOpt("L");
   rp1->SetSeparationMargin(0.0);
   rp1->Draw();
   rp1->GetLowerRefGraph()->SetMinimum(-2);
   rp1->GetLowerRefGraph()->SetMaximum(2);
   c1->Update();
}

Definition at line 524 of file TRatioPlot.cxx.

SetSplitFraction()

void TRatioPlot::SetSplitFraction

(

Float_t

sf

)

Set the fraction of the parent pad, at which the to sub pads should meet.

Definition at line 1635 of file TRatioPlot.cxx.

SetUpBottomMargin()

void TRatioPlot::SetUpBottomMargin

(

Float_t

margin

)

Sets the bottom margin of the upper pad.

Parameters

margin

The new margin

Definition at line 465 of file TRatioPlot.cxx.

SetupPads()

void TRatioPlot::SetupPads ( )

protectedvirtual

Setup the pads.

Definition at line 390 of file TRatioPlot.cxx.

SetUpTopMargin()

void TRatioPlot::SetUpTopMargin

(

Float_t

margin

)

Sets the top margin of the upper pad.

Parameters

margin

The new margin

Definition at line 454 of file TRatioPlot.cxx.

SubPadResized()

void TRatioPlot::SubPadResized

(

)

Slot that handles common resizing of upper and lower pad.

Definition at line 1588 of file TRatioPlot.cxx.

SyncAxesRanges()

void TRatioPlot::SyncAxesRanges ( )

protectedvirtual

Syncs the axes ranges from the shared ones to the actual ones.

Definition at line 860 of file TRatioPlot.cxx.

SyncPadMargins()

Bool_t TRatioPlot::SyncPadMargins ( )

protectedvirtual

Figures out which pad margin has deviated from the stored ones, to figure out what the new nominal is and set the other pad to it subsequently.

Definition at line 1417 of file TRatioPlot.cxx.

UnZoomed()

void TRatioPlot::UnZoomed

(

)

Slot for the UnZoomed signal that was introduced to TAxis.

Unzoom both pads

Definition at line 1572 of file TRatioPlot.cxx.

Member Data Documentation

fC1

Double_t TRatioPlot::fC1 = 1.

protected

Stores the scale factor for h1 (or THStack sum)

Definition at line 105 of file TRatioPlot.h.

fC2

Double_t TRatioPlot::fC2 = 1.

protected

Stores the scale factor for h2.

Definition at line 106 of file TRatioPlot.h.

fCi1Color

Color_t TRatioPlot::fCi1Color = kGreen

protected

Stores the color for the 1 sigma band.

Definition at line 97 of file TRatioPlot.h.

fCi2Color

Color_t TRatioPlot::fCi2Color = kYellow

protected

Stores the color for the 2 sigma band.

Definition at line 98 of file TRatioPlot.h.

fCl1

Double_t TRatioPlot::fCl1 = 0.6827

protected

Stores the confidence level for the inner confidence interval band.

Definition at line 102 of file TRatioPlot.h.

fCl2

Double_t TRatioPlot::fCl2 = 0.9545

protected

Stores the confidence level for the outer confidence interval band.

Definition at line 103 of file TRatioPlot.h.

fConfidenceInterval1

TGraphErrors* TRatioPlot::fConfidenceInterval1 = 0

protected

Stores the graph for the 1 sigma band.

Definition at line 95 of file TRatioPlot.h.

fConfidenceInterval2

TGraphErrors* TRatioPlot::fConfidenceInterval2 = 0

protected

Stores the graph for the 2 sigma band.

Definition at line 96 of file TRatioPlot.h.

fErrorMode

Int_t TRatioPlot::fErrorMode = TRatioPlot::ErrorMode::kErrorSymmetric

protected

Stores the error mode, sym, asym or func.

Definition at line 85 of file TRatioPlot.h.

fFitDrawOpt

TString TRatioPlot::fFitDrawOpt = ""

protected

Stores draw option for the fit function in the fit residual case.

Definition at line 90 of file TRatioPlot.h.

fFitResult

TFitResult* TRatioPlot::fFitResult = 0

protected

Stores the explicit fit result given in the fit residual case. Can be 0.

Definition at line 108 of file TRatioPlot.h.

fGraphDrawOpt

TString TRatioPlot::fGraphDrawOpt = ""

protected

Stores draw option for the lower plot graph given in constructor.

Definition at line 89 of file TRatioPlot.h.

fGridlinePositions

std::vector<double> TRatioPlot::fGridlinePositions

protected

Stores the y positions for the gridlines.

Definition at line 124 of file TRatioPlot.h.

fGridlines

std::vector<TLine*> TRatioPlot::fGridlines

protected

Keeps TLine objects for the gridlines.

Definition at line 123 of file TRatioPlot.h.

fH1

TH1* TRatioPlot::fH1 = 0

protected

Stores the primary histogram.

Definition at line 80 of file TRatioPlot.h.

fH1DrawOpt

TString TRatioPlot::fH1DrawOpt = ""

protected

Stores draw option for h1 given in constructor.

Definition at line 87 of file TRatioPlot.h.

fH2

TH1* TRatioPlot::fH2 = 0

protected

Stores the secondary histogram, if there is one.

Definition at line 81 of file TRatioPlot.h.

fH2DrawOpt

TString TRatioPlot::fH2DrawOpt = ""

protected

Stores draw option for h2 given in constructor.

Definition at line 88 of file TRatioPlot.h.

fHideLabelMode

Int_t TRatioPlot::fHideLabelMode = TRatioPlot::HideLabelMode::kHideLow

protected

Stores which label to hide if the margin is to narrow, if at all.

Definition at line 126 of file TRatioPlot.h.

fHistDrawProxy

TObject* TRatioPlot::fHistDrawProxy = 0

protected

The object which is actually drawn, this might be TH1 or THStack.

Definition at line 82 of file TRatioPlot.h.

fInsetWidth

Float_t TRatioPlot::fInsetWidth = 0.0025

protected

Definition at line 138 of file TRatioPlot.h.

fIsPadUpdating

Bool_t TRatioPlot::fIsPadUpdating = kFALSE

protected

Keeps track whether pads are updating during resizing.

Definition at line 141 of file TRatioPlot.h.

fIsUpdating

Bool_t TRatioPlot::fIsUpdating = kFALSE

protected

Keeps track of whether its currently updating to reject other calls until done.

Definition at line 140 of file TRatioPlot.h.

fLeftMargin

Float_t TRatioPlot::fLeftMargin = 0.1

protected

Stores the common left margin of both pads.

Definition at line 135 of file TRatioPlot.h.

fLowBottomMargin

Float_t TRatioPlot::fLowBottomMargin = 0.3

protected

Stores the bottom margin of the lower pad.

Definition at line 133 of file TRatioPlot.h.

fLowerGXaxis

TGaxis* TRatioPlot::fLowerGXaxis = 0

protected

Lower graphical x axis.

Definition at line 112 of file TRatioPlot.h.

fLowerGXaxisMirror

TGaxis* TRatioPlot::fLowerGXaxisMirror = 0

protected

Lower mirror of the x axis.

Definition at line 116 of file TRatioPlot.h.

fLowerGYaxis

TGaxis* TRatioPlot::fLowerGYaxis = 0

protected

Lower graphical y axis.

Definition at line 114 of file TRatioPlot.h.

fLowerGYaxisMirror

TGaxis* TRatioPlot::fLowerGYaxisMirror = 0

protected

Lower mirror of the y axis.

Definition at line 118 of file TRatioPlot.h.

fLowerPad

TPad* TRatioPlot::fLowerPad = 0

protected

The pad which contains the calculated lower plot part.

Definition at line 77 of file TRatioPlot.h.

fLowTopMargin

Float_t TRatioPlot::fLowTopMargin = 0.05

protected

Stores the top margin of the lower pad.

Definition at line 132 of file TRatioPlot.h.

fLowYaxis

TAxis* TRatioPlot::fLowYaxis = 0

protected

Clone of the lower y axis.

Definition at line 121 of file TRatioPlot.h.

fMode

Int_t TRatioPlot::fMode = 0

protected

Stores which calculation is supposed to be performed as specified by user option.

Definition at line 84 of file TRatioPlot.h.

fOption

TString TRatioPlot::fOption = ""

protected

Stores the option which is given in the constructor as a string.

Definition at line 86 of file TRatioPlot.h.

fParentPad

TVirtualPad* TRatioPlot::fParentPad = 0

protected

Stores the pad the ratio plot was created in.

Definition at line 75 of file TRatioPlot.h.

fRatioGraph

TGraph* TRatioPlot::fRatioGraph = 0

protected

Stores the lower plot's graph.

Definition at line 94 of file TRatioPlot.h.

fRightMargin

Float_t TRatioPlot::fRightMargin = 0.1

protected

Stores the common right margin of both pads.

Definition at line 136 of file TRatioPlot.h.

fSharedXAxis

TAxis* TRatioPlot::fSharedXAxis = 0

protected

X axis that stores the range for both plots.

Definition at line 110 of file TRatioPlot.h.

fShowConfidenceIntervals

Bool_t TRatioPlot::fShowConfidenceIntervals = kTRUE

protected

Stores whether to show the confidence interval bands. From Draw option.

Definition at line 100 of file TRatioPlot.h.

fShowGridlines

Bool_t TRatioPlot::fShowGridlines = kTRUE

protected

Stores whether to show the gridlines at all.

Definition at line 125 of file TRatioPlot.h.

fSplitFraction

Float_t TRatioPlot::fSplitFraction = 0.3

protected

Stores the fraction at which the upper and lower pads meet.

Definition at line 92 of file TRatioPlot.h.

fTopPad

TPad* TRatioPlot::fTopPad = 0

protected

The Pad that drawn on top on the others to have consistent coordinates.

Definition at line 78 of file TRatioPlot.h.

fUpBottomMargin

Float_t TRatioPlot::fUpBottomMargin = 0.05

protected

Stores the bottom margin of the upper pad.

Definition at line 131 of file TRatioPlot.h.

fUpperGXaxis

TGaxis* TRatioPlot::fUpperGXaxis = 0

protected

Upper graphical x axis.

Definition at line 111 of file TRatioPlot.h.

fUpperGXaxisMirror

TGaxis* TRatioPlot::fUpperGXaxisMirror = 0

protected

Upper mirror of the x axis.

Definition at line 115 of file TRatioPlot.h.

fUpperGYaxis

TGaxis* TRatioPlot::fUpperGYaxis = 0

protected

Upper graphical y axis.

Definition at line 113 of file TRatioPlot.h.

fUpperGYaxisMirror

TGaxis* TRatioPlot::fUpperGYaxisMirror = 0

protected

Upper mirror of the y axis.

Definition at line 117 of file TRatioPlot.h.

fUpperPad

TPad* TRatioPlot::fUpperPad = 0

protected

The pad which contains the upper plot part.

Definition at line 76 of file TRatioPlot.h.

fUpTopMargin

Float_t TRatioPlot::fUpTopMargin = 0.1

protected

Stores the top margin of the upper pad.

Definition at line 130 of file TRatioPlot.h.

fUpYaxis

TAxis* TRatioPlot::fUpYaxis = 0

protected

Clone of the upper y axis.

Definition at line 120 of file TRatioPlot.h.

Libraries for TRatioPlot:

[legend]