Logo ROOT   6.14/05
Reference Guide
Namespaces
mrt.py File Reference

Namespaces

 mrt
 

Detailed Description

View in nbviewer Open in SWAN 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.

0.00483202934265
2.92797088623
opening file /mnt/build/workspace/root-makedoc-v614/rootspi/rdoc/src/v6-14-00-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'
Author
Wim Lavrijsen

Definition in file mrt.py.