df031_Stats.py File Reference

Namespaces
namespace	df031_Stats

Detailed Description

Use the Stats action to extract the statistics of a column.

Extract the statistics relative to RDataFrame columns and store them in TStatistic instances.

 
import ROOT
 
# Create a data frame and add two columns: one for the values and one for the weight.
r = ROOT.RDataFrame(256);
rr = r.Define("v", "rdfentry_")\
      .Define("w", "return 1./(v+1)")
 
# Now extract the statistics, weighted, unweighted
stats_iu = rr.Stats("v")
stats_iw = rr.Stats("v", "w")
 
# Now print them: they are all identical of course!
stats_iu.Print()
stats_iw.Print()

 OBJ: TStatistic      Mean = 127.5 +- 4.628   RMS = 74.045   Count = 256    Min = 0     Max = 255
 OBJ: TStatistic      Mean = 40.8 +- 12.86    RMS = 60.318   Count = 256    Min = 0     Max = 255

Date

April 2019

Author

Danilo Piparo (CERN)

Definition in file df031_Stats.py.