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mrt.py File Reference

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namespace  mrt
 

Detailed Description

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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-v618/rootspi/rdoc/src/v6-18-00-patches.build/tutorials/pyroot/aptuple.txt ...
writing file aptuple.root ...
done
import sys, string, os
from ROOT import TFile, TNtuple
ifn = os.path.expandvars("${ROOTSYS}/tutorials/pyroot/aptuple.txt")
ofn = 'aptuple.root'
print 'opening file', ifn, '...'
infile = open( ifn, 'r' )
lines = infile.readlines()
title = lines[0]
labels = string.split( lines[1] )
print 'writing file', ofn, '...'
outfile = TFile( ofn, 'RECREATE', 'ROOT file with an NTuple' )
ntuple = TNtuple( 'ntuple', title, string.join( labels, ':') )
for line in lines[2:]:
words = string.split( line )
row = map( float, words )
apply( ntuple.Fill, row )
outfile.Write()
print 'done'
A ROOT file is a suite of consecutive data records (TKey instances) with a well defined format.
Definition: TFile.h:48
A simple TTree restricted to a list of float variables only.
Definition: TNtuple.h:28
Author
Wim Lavrijsen

Definition in file mrt.py.