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rf503_wspaceread.py File Reference

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namespace  rf503_wspaceread
 

Detailed Description

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'ORGANIZATION AND SIMULTANEOUS FITS' RooFit tutorial macro #503

Reading and using a workspace

The input file for self macro is generated by rf502_wspaceread.py

import ROOT
# Read workspace from file
# -----------------------------------------------
# Open input file with workspace (generated by rf503_wspacewrite)
f = ROOT.TFile("rf502_workspace_py.root")
# Retrieve workspace from file
w = f.Get("w")
# Retrieve pdf, data from workspace
# -----------------------------------------------------------------
# Retrieve x, and data from workspace
x = w["x"]
model = w["model"]
data = w["modelData"]
# Print structure of composite p.d.f.
model.Print("t")
# Fit model to data, plot model
# ---------------------------------------------------------
# Fit model to data
model.fitTo(data)
# Plot data and PDF overlaid
xframe = x.frame(Title="Model and data read from workspace")
data.plotOn(xframe)
model.plotOn(xframe)
# Overlay the background component of model with a dashed line
model.plotOn(xframe, Components="bkg", LineStyle="--")
# Overlay the background+sig2 components of model with a dotted line
model.plotOn(xframe, Components="bkg,sig2", LineStyle=":")
# Draw the frame on the canvas
c = ROOT.TCanvas("rf503_wspaceread", "rf503_wspaceread", 600, 600)
ROOT.gPad.SetLeftMargin(0.15)
xframe.GetYaxis().SetTitleOffset(1.4)
xframe.Draw()
c.SaveAs("rf503_wspaceread.png")
Date
February 2018
Author
Clemens Lange

Definition in file rf503_wspaceread.py.