doc/master/rf105__funcbinding_8py.html

import ROOT


# Bind ROOT TMath::Erf C function

# ---------------------------------------------------


# Bind one-dimensional ROOT.TMath.Erf function as ROOT.RooAbsReal function

x = ROOT.RooRealVar("x", "x", -3, 3)

erf = ROOT.RooFit.bindFunction("erf", ROOT.TMath.Erf, x)


# Print erf definition

erf.Print()


# Plot erf on frame

frame1 = x.frame(Title="TMath.Erf bound as ROOT.RooFit function")

erf.plotOn(frame1)


# Bind ROOT::Math::beta_pdf C function

# -----------------------------------------------------------------------


# Bind pdf ROOT.Math.Beta with three variables as ROOT.RooAbsPdf function

x2 = ROOT.RooRealVar("x2", "x2", 0, 0.999)

a = ROOT.RooRealVar("a", "a", 5, 0, 10)

b = ROOT.RooRealVar("b", "b", 2, 0, 10)

beta = ROOT.RooFit.bindPdf("beta", ROOT.Math.beta_pdf, x2, a, b)


# Perf beta definition

beta.Print()


# Generate some events and fit

data = beta.generate({x2}, 10000)

beta.fitTo(data, PrintLevel=-1)


# Plot data and pdf on frame

frame2 = x2.frame(Title="ROOT.Math.Beta bound as ROOT.RooFit pdf")

data.plotOn(frame2)

beta.plotOn(frame2)


# Bind ROOT TF1 as RooFit function

# ---------------------------------------------------------------


# Create a ROOT TF1 function

fa1 = ROOT.TF1("fa1", "sin(x)/x", 0, 10)


# Create an observable

x3 = ROOT.RooRealVar("x3", "x3", 0.01, 20)


# Create binding of TF1 object to above observable

rfa1 = ROOT.RooFit.bindFunction(fa1, x3)


# Print rfa1 definition

rfa1.Print()


# Make plot frame in observable, TF1 binding function

frame3 = x3.frame(Title="TF1 bound as ROOT.RooFit function")

rfa1.plotOn(frame3)


c = ROOT.TCanvas("rf105_funcbinding", "rf105_funcbinding", 1200, 400)

c.Divide(3)

c.cd(1)

ROOT.gPad.SetLeftMargin(0.15)

frame1.GetYaxis().SetTitleOffset(1.6)

frame1.Draw()

c.cd(2)

ROOT.gPad.SetLeftMargin(0.15)

frame2.GetYaxis().SetTitleOffset(1.6)

frame2.Draw()

c.cd(3)

ROOT.gPad.SetLeftMargin(0.15)

frame3.GetYaxis().SetTitleOffset(1.6)

frame3.Draw()


c.SaveAs("rf105_funcbinding.png")

TRangeDynCast
ROOT::Detail::TRangeCast< T, true > TRangeDynCast
TRangeDynCast is an adapter class that allows the typed iteration through a TCollection.
Definition TCollection.h:358