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ROOT::R::TRInterface Class Reference

ROOT R was implemented using the R Project library and the modules Rcpp and RInside

TRInterface class

The TRInterface class lets you process R code from ROOT.
You can call R libraries and their functions, plot results in R or ROOT,
and use the power of ROOT and R at the same time.
It also lets you pass scalars, vectors and matrices from ROOT to R
and from R to ROOT using TRObject; but you can to use overloaded operators [],<< and >>
to work with ROOTR like work with streams of data.

TRInterface class can not be instantiated directly, but you can create objects using the static methods TRInterface& Instance() and TRInterface* InstancePtr() to create your own objects.

Show an example below: Create an exponential fit, the idea is to create a set of numbers x,y with noise from ROOT, pass them to R and fit the data to \( x^3 \), get the fitted coefficient(power) and plot the data, the known function and the fitted function.

TCanvas *c1 = new TCanvas("c1","Curve Fit",700,500);
c1->SetGrid();
// draw a frame for multiples graphs
// create the first graph (points with gaussian noise)
const Int_t n = 24;
//Generate points along a X^3 with noise
rg.SetSeed(520);
for (Int_t i = 0; i < n; i++) {
x[i] = rg.Uniform(0, 1);
y[i] = TMath::Power(x[i], 3) + rg.Gaus() * 0.06;
}
TGraph *gr1 = new TGraph(n,x,y);
gr1->SetMarkerSize(1);
mg->Add(gr1);
// create second graph
TF1 *f_known=new TF1("f_known","pow(x,3)",0,1);
TGraph *gr2 = new TGraph(f_known);
gr2->SetMarkerSize(1);
mg->Add(gr2);
//passing x and y values to R for fitting
r["x"]<<TVectorD(n, x);
r["y"]<<TVectorD(n, y);
//creating a R data frame
r<<"ds<-data.frame(x=x,y=y)";
//fitting x and y to X^power using Nonlinear Least Squares
r<<"m <- nls(y ~ I(x^power),data = ds, start = list(power = 1),trace = T)";
//getting the fitted value (power)
Double_t power;
r["summary(m)$coefficients[1]"]>>power;
TF1 *f_fitted=new TF1("f_fitted","pow(x,[0])",0,1);
f_fitted->SetParameter(0,power);
//plotting the fitted function
TGraph *gr3 = new TGraph(f_fitted);
gr3->SetMarkerSize(1);
mg->Add(gr3);
mg->Draw("ap");
//displaying basic results
TPaveText *pt = new TPaveText(0.1,0.6,0.5,0.9,"brNDC");
pt->AddText("Fitting x^power ");
pt->AddText(" \"Blue\" Points with gaussian noise to be fitted");
pt->AddText(" \"Red\" Known function x^3");
TString fmsg;
fmsg.Form(" \"Green\" Fitted function with power=%.4lf",power);
pt->AddText(fmsg);
pt->Draw();
c1->Update();
ROOT::R::TRInterface & r
Definition Object.C:4
double Double_t
Definition RtypesCore.h:59
@ kRed
Definition Rtypes.h:66
@ kGreen
Definition Rtypes.h:66
@ kBlue
Definition Rtypes.h:66
TVectorT< Double_t > TVectorD
Definition TVectorDfwd.h:23
ROOT R was implemented using the R Project library and the modules Rcpp and RInside
static TRInterface & Instance()
static method to get an TRInterface instance reference
virtual void SetFillColor(Color_t fcolor)
Set the fill area color.
Definition TAttFill.h:37
virtual void SetMarkerColor(Color_t mcolor=1)
Set the marker color.
Definition TAttMarker.h:38
virtual void SetMarkerStyle(Style_t mstyle=1)
Set the marker style.
Definition TAttMarker.h:40
virtual void SetMarkerSize(Size_t msize=1)
Set the marker size.
Definition TAttMarker.h:41
virtual void SetTextAlign(Short_t align=11)
Set the text alignment.
Definition TAttText.h:42
The Canvas class.
Definition TCanvas.h:23
1-Dim function class
Definition TF1.h:213
virtual void SetParameter(Int_t param, Double_t value)
Definition TF1.h:634
A TGraph is an object made of two arrays X and Y with npoints each.
Definition TGraph.h:41
A TMultiGraph is a collection of TGraph (or derived) objects.
Definition TMultiGraph.h:36
virtual void Add(TGraph *graph, Option_t *chopt="")
Add a new graph to the list of graphs.
virtual void Draw(Option_t *chopt="")
Draw this multigraph with its current attributes.
A Pave (see TPave) with text, lines or/and boxes inside.
Definition TPaveText.h:21
virtual TText * AddText(Double_t x1, Double_t y1, const char *label)
Add a new Text line to this pavetext at given coordinates.
virtual void Draw(Option_t *option="")
Draw this pavetext with its current attributes.
This is the base class for the ROOT Random number generators.
Definition TRandom.h:27
virtual Double_t Gaus(Double_t mean=0, Double_t sigma=1)
Samples a random number from the standard Normal (Gaussian) Distribution with the given mean and sigm...
Definition TRandom.cxx:274
virtual void SetSeed(ULong_t seed=0)
Set the random generator seed.
Definition TRandom.cxx:608
virtual Double_t Uniform(Double_t x1=1)
Returns a uniform deviate on the interval (0, x1).
Definition TRandom.cxx:672
Basic string class.
Definition TString.h:136
void Form(const char *fmt,...)
Formats a string using a printf style format descriptor.
Definition TString.cxx:2314
TPaveText * pt
return c1
Definition legend1.C:41
Double_t y[n]
Definition legend1.C:17
Double_t x[n]
Definition legend1.C:17
const Int_t n
Definition legend1.C:16
LongDouble_t Power(LongDouble_t x, LongDouble_t y)
Definition TMath.h:685

Users Guide

https://oproject.org/pages/ROOT R Users Guide

Definition at line 136 of file TRInterface.h.

Classes

class  Binding
 

Public Member Functions

 ~TRInterface ()
 
template<typename T >
void Assign (const T &var, const TString &name)
 Template method to assign C++ variables into R environment.
 
void Assign (const TRDataFrame &df, const TString &name)
 Method to assign TRDataFrame in R's environment.
 
void Assign (const TRFunctionExport &fun, const TString &name)
 Method to assign TRFunctionExport in R's environment.
 
TRObject Eval (const TString &code)
 Method to eval R code and you get the result in a TRObject.
 
Int_t Eval (const TString &code, TRObject &ans)
 Method to eval R code and you get the result in a reference to TRObject.
 
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.
 
void Execute (const TString &code)
 Method to eval R code.
 
virtual void Execute (TMethod *method, TObjArray *params, Int_t *error=0)
 Execute method on this object with parameters stored in the TObjArray.
 
Bool_t Install (TString pkg, TString repos="http://cran.r-project.org")
 Method to install an R's package.
 
void Interactive ()
 Method to get a R prompt to work interactively with tab completion support.
 
Bool_t IsInstalled (TString pkg)
 Method to verify if a package is installed.
 
Binding operator[] (const TString &name)
 
void ProcessEventsLoop ()
 Init event loop in a thread to support actions in windows from R graphics system.
 
Bool_t Require (TString pkg)
 Method to load an R's package.
 
void SetVerbose (Bool_t status)
 Method to set verbose mode, that produce extra output.
 
- 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 Clear (Option_t *="")
 
virtual TObjectClone (const char *newname="") const
 Make a clone of an object using the Streamer facility.
 
virtual Int_t Compare (const TObject *obj) const
 Compare abstract method.
 
virtual void Copy (TObject &object) const
 Copy this to obj.
 
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 Draw (Option_t *option="")
 Default Draw method for all objects.
 
virtual void DrawClass () const
 Draw class inheritance tree of the class to which this object belongs.
 
virtual TObjectDrawClone (Option_t *option="") const
 Draw a clone of this object in the current selected pad for instance with: gROOT->SetSelectedPad(gPad).
 
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 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 TObjectFindObject (const char *name) const
 Must be redefined in derived classes.
 
virtual TObjectFindObject (const TObject *obj) const
 Must be redefined in derived classes.
 
virtual Option_tGetDrawOption () const
 Get option used by the graphics system to draw this object.
 
virtual const char * GetIconName () const
 Returns mime type name of object.
 
virtual const char * GetName () const
 Returns 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_tGetOption () const
 
virtual const char * GetTitle () const
 Returns title of object.
 
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.
 
virtual ULong_t Hash () const
 Return hash value for this object.
 
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
 
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.
 
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.
 
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)
 Operator delete [].
 
voidoperator new (size_t sz)
 
voidoperator new (size_t sz, void *vp)
 
voidoperator new[] (size_t sz)
 
voidoperator new[] (size_t sz, void *vp)
 
TObjectoperator= (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 void Print (Option_t *option="") const
 This method must be overridden when a class wants to print itself.
 
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.
 
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=0, Int_t option=0, Int_t bufsize=0)
 Write this object to the current directory.
 
virtual Int_t Write (const char *name=0, Int_t option=0, Int_t bufsize=0) const
 Write this object to the current directory.
 

Static Public Member Functions

static TRInterfaceInstance ()
 static method to get an TRInterface instance reference
 
static TRInterfaceInstancePtr ()
 static method to get an TRInterface instance pointer
 
- Static Public Member Functions inherited from TObject
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.
 

Protected Attributes

RInside * fR
 
TThreadth
 

Private Member Functions

 TRInterface (const Int_t argc=0, const Char_t *argv[]=NULL, const Bool_t loadRcpp=true, const Bool_t verbose=false, const Bool_t interactive=true)
 The command line arguments are by default argc=0 and argv=NULL, The verbose mode is by default disabled but you can enable it to show procedures information in stdout/stderr.
 

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)
}
 
- Protected Types inherited from TObject
enum  { kOnlyPrepStep = BIT(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 ()
 

#include <TRInterface.h>

Inheritance diagram for ROOT::R::TRInterface:
[legend]

Constructor & Destructor Documentation

◆ TRInterface()

TRInterface::TRInterface ( const Int_t  argc = 0,
const Char_t argv[] = NULL,
const Bool_t  loadRcpp = true,
const Bool_t  verbose = false,
const Bool_t  interactive = true 
)
private

The command line arguments are by default argc=0 and argv=NULL, The verbose mode is by default disabled but you can enable it to show procedures information in stdout/stderr.

Note
some time can produce so much noise in the output
Parameters
argcdefault 0
argvdefault null
loadRcppdefault true
verbosedefault false
interactivedefault true

Definition at line 33 of file TRInterface.cxx.

◆ ~TRInterface()

TRInterface::~TRInterface ( )

Definition at line 71 of file TRInterface.cxx.

Member Function Documentation

◆ Assign() [1/3]

template<typename T >
void ROOT::R::TRInterface::Assign ( const T &  var,
const TString name 
)
inline

Template method to assign C++ variables into R environment.

Parameters
varany R wrappable datatype
namename of the variable in R's environment

Definition at line 254 of file TRInterface.h.

◆ Assign() [2/3]

void TRInterface::Assign ( const TRDataFrame df,
const TString name 
)

Method to assign TRDataFrame in R's environment.

Parameters
dfTRDataFrame
namename of the variable in R's environment

Definition at line 154 of file TRInterface.cxx.

◆ Assign() [3/3]

void TRInterface::Assign ( const TRFunctionExport fun,
const TString name 
)

Method to assign TRFunctionExport in R's environment.

Parameters
funTRFunctionExport
namename of the variable in R's environment

Definition at line 148 of file TRInterface.cxx.

◆ Eval() [1/2]

TRObject TRInterface::Eval ( const TString code)

Method to eval R code and you get the result in a TRObject.

Parameters
codeR code
Returns
a TRObject with result

Definition at line 113 of file TRInterface.cxx.

◆ Eval() [2/2]

Int_t TRInterface::Eval ( const TString code,
TRObject ans 
)

Method to eval R code and you get the result in a reference to TRObject.

Parameters
codeR code
ansreference to TRObject
Returns
an true or false if the execution was successful or not.

Definition at line 80 of file TRInterface.cxx.

◆ Execute() [1/3]

void TObject::Execute ( const char *  method,
const char *  params,
Int_t error = 0 
)
virtual

Execute method on this object with the given parameter string, e.g.

"3.14,1,\"text\"".

Reimplemented from TObject.

Definition at line 130 of file TObject.cxx.

◆ Execute() [2/3]

void TRInterface::Execute ( const TString code)

Method to eval R code.

Parameters
codeR code

Definition at line 99 of file TRInterface.cxx.

◆ Execute() [3/3]

void TObject::Execute ( TMethod method,
TObjArray params,
Int_t error = 0 
)
virtual

Execute method on this object with parameters stored in the TObjArray.

The TObjArray should contain an argv vector like:

argv[0] ... argv[n] = the list of TObjString parameters
Collectable string class.
Definition TObjString.h:28

Reimplemented from TObject.

Definition at line 131 of file TObject.cxx.

◆ Install()

Bool_t TRInterface::Install ( TString  pkg,
TString  repos = "http://cran.r-project.org" 
)

Method to install an R's package.

Parameters
pkgR's pkg name
reposurl for R's package repository
Returns
true or false if the package was installed or not

Definition at line 207 of file TRInterface.cxx.

◆ Instance()

TRInterface & TRInterface::Instance ( )
static

static method to get an TRInterface instance reference

Returns
TRInterface instance reference

Definition at line 187 of file TRInterface.cxx.

◆ InstancePtr()

TRInterface * TRInterface::InstancePtr ( )
static

static method to get an TRInterface instance pointer

Returns
TRInterface instance pointer

Definition at line 175 of file TRInterface.cxx.

◆ Interactive()

void TRInterface::Interactive ( )

Method to get a R prompt to work interactively with tab completion support.

Definition at line 161 of file TRInterface.cxx.

◆ IsInstalled()

Bool_t TRInterface::IsInstalled ( TString  pkg)

Method to verify if a package is installed.

Parameters
pkgR's pkg name
Returns
true or false if the package is installed or not

Definition at line 193 of file TRInterface.cxx.

◆ operator[]()

TRInterface::Binding TRInterface::operator[] ( const TString name)

Definition at line 142 of file TRInterface.cxx.

◆ ProcessEventsLoop()

void TRInterface::ProcessEventsLoop ( )

Init event loop in a thread to support actions in windows from R graphics system.

Definition at line 219 of file TRInterface.cxx.

◆ Require()

Bool_t TRInterface::Require ( TString  pkg)

Method to load an R's package.

Parameters
pkgR's pkg name
Returns
true or false if the package was loaded or not

Definition at line 200 of file TRInterface.cxx.

◆ SetVerbose()

void TRInterface::SetVerbose ( Bool_t  status)

Method to set verbose mode, that produce extra output.

Note
some time can produce so much noise in the output
Parameters
statusboolean to enable of disable

Definition at line 134 of file TRInterface.cxx.

Member Data Documentation

◆ fR

RInside* ROOT::R::TRInterface::fR
protected

Definition at line 138 of file TRInterface.h.

◆ th

TThread* ROOT::R::TRInterface::th
protected

Definition at line 139 of file TRInterface.h.

Libraries for ROOT::R::TRInterface:

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