Getting Started with PyROOT

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How PyROOT Works

The basics of PyROOT are well explained in this HOW-TO on the ROOT site. You have to make sure that Python can see ROOT:

   export PYTHONPATH=$ROOTSYS/lib:$PYTHONPATH

and that ROOT can see Python:

   export LD_LIBRARY_PATH=$ROOTSYS/lib:$PYTHONDIR/lib:\
                          $LD_LIBRARY_PATH

Now you can just use Python import statements to load the appropriate ROOT modules into your Python environment.

For example, (from the above HOWTO):

#!/bin/env python

# import the ROOT modules we will use (must be explicit)
from ROOT import gROOT, TCanvas, TF1 

gROOT.Reset()
c1 = TCanvas('c1', 'Example with Formula', 200, 10, 700, 500)

# make a function
func1 = TF1('func1', 'abs(sin(x)/x)', 0, 10)
c1.SetGridx()
c1.SetGridy()

# draw the function
func1.Draw()
c1.Update()

# wait for input before destroying the ROOT window
raw_input("Press Enter To Continue: ")

And that's it. I have some of my scripts collected here in case they are useful to anyone learning PyROOT or Python.

My Scripts

xy_plot.py - plot a simple xy graph from a text file with two columns of data.

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