I am working with a .root file. I wanted to know how NTuple works and what exactly it is used for.
I have a .root file and I open it with:
fp = ROOT.TFile("file.root", "READ") # Opens the file
What can NTuple do if I extract only data lines from the .root file and do some calculations for each data line and then fill a histogram. ROOT Version: Not Provided Platform: Not Provided Compiler: Not Provided
In the example provided in the first link you have what does the third term mean:
// Fill an n-tuple and write it to a file simulating measurement of
// conductivity of a material in different conditions of pressure
// and temperature.
void write_ntuple_to_file(){
TFile ofile("conductivity_experiment.root","RECREATE");
// Initialise the TNtuple
TNtuple cond_data("cond_data",
"Example N-Tuple",
"Potential:Current:Temperature:Pressure");
I.e what does “Potential:Current:Temperature:Pressure” mean or do?