mrt.py File Reference

Namespaces
namespace	mrt

Detailed Description

Build ROOT Ntuple from other source.

This program reads the ‘aptuple.txt’ file row by row, then creates the Ntuple by adding row by row.

opening file /home/sftnight/build/workspace/root-makedoc-v628/rootspi/rdoc/src/v6-28-00-patches.build/tutorials/pyroot/aptuple.txt ...
writing file aptuple.root ...
done

 
import sys, os
from ROOT import TFile, TNtuple, TROOT
 
 
ifn = os.path.join(str(TROOT.GetTutorialDir()), 'pyroot', 'aptuple.txt')
ofn = 'aptuple.root'
 
print('opening file %s ...' % ifn)
infile = open( ifn, 'r' )
lines  = infile.readlines()
title  = lines[0]
labels = lines[1].split()
 
print('writing file %s ...' % ofn)
outfile = TFile( ofn, 'RECREATE', 'ROOT file with an NTuple' )
ntuple  = TNtuple( 'ntuple', title, ':'.join( labels ) )
 
for line in lines[2:]:
    words = line.split()
    row = map( float, words )
    ntuple.Fill(*row)
 
outfile.Write()
 
print('done')

Author

Wim Lavrijsen

Definition in file mrt.py.