===== Python and PyROOT ======

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== Contents ==

   * Introduction 
   * ...
   * ...

**Keywords:**

===== Introduction =====




Scriptini utili per analisi dati


===== Set up the environment =====

<code>
./configure linux --enable-python
</code>


<code>
setenv ROOTSYS /opt/root
setenv PYTHONPATH $ROOTSYS/bin
</code>

===== Plot y-data vs. x-data  =====


<code>

from ROOT import TGraph

plot = TGraph("filename","%lg %lg")
# plot = TGraph("filename","%lg ; %lg")     # csv values

plot.Draw("ALP")
</code>

===== Histogram of a simple column of data =====

<code>
3.14159
2.71828
1.61803
...
...
</code>


<code>
#!/usr/bin/env python

from ROOT import TH1F

file = open("data.dat","r")
histo = TH1F("histo","histo",100,-5,5)

for line in file:
   xval = float(line.split("\n")[0])
   histo.Fill(xval)

histo.SetTitle("Title")
histo.GetXaxis().SetTitle("x-axis")
histo.GetYaxis().SetTitle("y-axis")
histo.Draw("options")

file.close()
raw_input()
</code>


===== Histogram of a csv file =====

<code>
3.14159 ; ...
2.71828 ; ...
1.61803 ; ...
...     ; ...
...     ; ...
</code>




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