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#! /usr/bin/env python
"""%prog
Read in .root files and write out the histograms in FLAT
format suitable for make-plots.
Use e.g. 'root2flat file1.root -o flathistos' to produce the flat histogram
files which need to be converted to AIDA files using Rivet's flat2aida tool
Usage:
%prog [options] file1.root
Use --help to get information for all options.
"""
import sys
if sys.version_info[:3] < (2,4,0):
print "rivet scripts require Python version >= 2.4.0... exiting"
sys.exit(1)
import os, optparse, logging, ROOT
# try:
# from IPython.Shell import IPShellEmbed
# ipshell = IPShellEmbed([])
# except:
# print "Ipython shell not available."
## Parse options
parser = optparse.OptionParser(usage = __doc__)
parser.add_option("-o", dest="OUTDIR", default=".",
help = "specify directory in which to write out converted files")
(opts, args) = parser.parse_args()
def readROOT(rootfile):
""" This is the main function that opens a ROOT file, browses its contents
for histograms and tries to write the converted histos to files.
"""
# Open the ROOT file
f = ROOT.TFile(rootfile)
# Initial browse to see the structure
subdirs, histonames, tgraphnames = browse(f)
# Keep browding if there are subdirectories TODO: Make this work for
# arbitrarily deep directory structures
if len(subdirs) > 0:
for sd in subdirs:
t_s, t_h = browse(f, sd)
histonames.extend(t_h)
#primary_keys = f.GetListOfKeys()
#iter_primaries = ROOT.TListIter(primary_keys)
# This will convert and write the histos
for histoname in histonames:
writeHisto(histoname, f.Get(histoname))
for tgraphname in tgraphnames:
writeHisto(tgraphname, f.Get(tgraphname), True)
def browse(f, branch=None):
""" This function browses a file/branch, trying to find objects that
either inherit from TH1 or from TProfile.
"""
# Prepare return values
histos = []
tgraphs = []
subdirs = []
# Get Iterator
if branch:
f.Cd(branch)
primary_keys = ROOT.gDirectory.GetListOfKeys()
iter_primaries = ROOT.TListIter(primary_keys)
if branch:
f.Cd('..')
# Iterate over iterator
for i in xrange(len(primary_keys)):
if branch:
t_n = branch + '/' + iter_primaries.Next().GetName()
else:
t_n = iter_primaries.Next().GetName()
# Make sure we don't have a NoneType object here
if f.Get(t_n):
# Check if the curent hing is a directory
if type(f.Get(t_n)) == ROOT.TDirectoryFile:
subdirs.append(t_n)
# Check if the curent hing is a histogram
elif f.Get(t_n).InheritsFrom("TH1") or f.Get(t_n).InheritsFrom("TProfile"):
histos.append(t_n)
elif f.Get(t_n).InheritsFrom("TGraphAsymmErrors"):
tgraphs.append(t_n)
return subdirs, histos, tgraphs
def convertHisto(R_histo):
""" This function reads a single ROOT histo and converts it into the
FLAT format suitable for plotting with make-plots.
"""
title = R_histo.GetTitle().replace("#","\\")
xtitle= R_histo.GetXaxis().GetTitle().replace("#","\\")
ytitle= R_histo.GetYaxis().GetTitle().replace("#","\\")
bins = getBinsFromTH1F(R_histo)
for bin in bins:
try:
binstr = ""
for key in ["xlow", "xhigh", "y", "y_err_low", "y_err_high"]:
binstr += "%s: %e " % (key, bin[key])
logging.info(binstr)
except:
pass
return title, xtitle, ytitle, bins
def convertTGraph(TGraph):
title = TGraph.GetTitle().replace("#","\\")
xtitle= TGraph.GetXaxis().GetTitle().replace("#","\\")
ytitle= TGraph.GetYaxis().GetTitle().replace("#","\\")
bins = getBinsFromTGraph(TGraph)
return title, xtitle, ytitle, bins
def getBinsFromTH1F(R_histo):
""" A little helper function that returns a list of bin-dictionaries).
"""
allbins=[]
for ii in xrange(R_histo.GetNbinsX()):
i = ii + 1
xlow = R_histo.GetBinLowEdge(i)
xhigh = xlow + R_histo.GetBinWidth(i)
y = R_histo.GetBinContent(i)
y_err = R_histo.GetBinError(i)
bin = {"xlow":xlow, "xhigh":xhigh, "y":y, "y_err_low":y_err, "y_err_high":y_err}
allbins.append(bin)
return allbins
def getBinsFromTGraph(TGraph):
allbins=[]
X = TGraph.GetX()
Y = TGraph.GetY()
for ii in xrange(TGraph.GetN()):
i = ii + 1
xlow = X[i] - TGraph.GetErrorXlow(i)
xhigh = X[i] + TGraph.GetErrorXhigh(i)
y = Y[i]
y_err_low = TGraph.GetErrorYlow(i)
y_err_high = TGraph.GetErrorYhigh(i)
bin = {"xlow":xlow, "xhigh":xhigh, "y":y, "y_err_low":y_err_low, "y_err_high":y_err_high}
allbins.append(bin)
return allbins
def writeHisto(name, R_histo, tgraph=False):
""" This writes the histogram into a single file, ready to plot with
make-plots.
"""
if tgraph:
title, xlabel, ylabel, bins = convertTGraph(R_histo)
else:
title, xlabel, ylabel, bins = convertHisto(R_histo)
head = "# BEGIN PLOT\nTitle=%s\nLegend=1\nLogY=1\nDrawOnly=%s\n" % (title, name)
head += "XLabel=%s\nYLabel=%s\n# END PLOT\n" % (xlabel, ylabel)
histo = getFlatHisto(bins, name, title)
flatname = name.replace("/","_") + ".dat"
if flatname.startswith("_"):
flatname = flatname[1:]
flatfile = os.path.join(opts.OUTDIR, flatname)
f = open(flatfile, "w")
f.write(head)
f.write("\n")
f.write(histo)
f.close()
def getFlatHisto(bins, name, title):
""" This returns a histo in the FLAT format. """
histo= "# BEGIN HISTOGRAM %s\n" % name
histo += "LineColor=black\n"
histo += "ErrorBars=1\n"
histo += "PolyMarker=*\n"
histo += "Title=%s\n" % title
for bin in bins:
histo += "%.8e\t%.8e\t%.8e\t%.8e\t%.8e\n" % (bin["xlow"], bin["xhigh"],
bin["y"], bin["y_err_low"], bin["y_err_high"])
histo += "# END HISTOGRAM\n"
return histo
if __name__ == "__main__":
for infile in args:
if not os.path.exists(opts.OUTDIR):
os.mkdir(opts.OUTDIR)
readROOT(infile)
print "Done. Written all plot files to %s" % opts.OUTDIR

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