parser.add_argument('files',
nargs='+',
help="""Root Files Containing Histograms to Merge""")
parser.add_argument(
'--method',
default="sum",
help="""Method of merging. Default is summing all distributions""")
parser.add_argument('--output',
'-o',
default="combined.root",
help="""Output file name""")
parser.add_argument(
'--hname',
default="combined",
help="""Name of histogram stored in the output root file""")
args = parser.parse_args()
if args.method == "sum":
PlotUtil.AddTH1DFromRoot(args.files,
fout_name=args.output,
hout_name=args.hname)
elif (args.method == "dif"):
if (len(args.files) == 2):
PlotUtil.SubtractTH1DFromRoot(args.files[0],
args.files[1],
fout_name=args.output,
hout_name=args.hname)
else:
raise Exception(
"Exactly two histograms should be provided for taking difference. {0} provided."
.format(len(args.files)))