def getClone(tfile, root_dir, name):
th1 = getHist(tfile, root_dir, name)
cloned = th1.Clone()
cloned.SetDirectory(0)
cloned.Sumw2()
ROOT.SetOwnership(cloned, 1)
return cloned
def getHist(tfile, root_dir, name):
readname = ''
if root_dir != '':
readname = root_dir + '/'
readname += name
#print 'getting ',readname
th1 = tfile.Get(readname)
try:
if th1.IsZombie():
print 'no such histogram!'
return None
except ReferenceError, e:
print "Failed to read %s" % readname
return None
ROOT.SetOwnership(th1, 1)
return th1
# get a clone of the histogram, considering its location
def getClone(tfile, root_dir, name):
th1 = getHist(tfile, root_dir, name)
cloned = th1.Clone()
cloned.SetDirectory(0)
cloned.Sumw2()
ROOT.SetOwnership(cloned, 1)
return cloned
# substitute the leading part of the name (Top, WJets, etc) by user-defined prefix
# will help to deal with multiple single top templates, for example