How can I make a histogram with a .csv file?

[couet]

Converting csv to root

Sorry that i forgot to include some of the code i wrote. I only manage wrote the part that convert to root. (note: from TBrowser() I only see the name of the tree so i figure i must have done something wrong) void convertCSV() { TString dir = gSystem->UnixPathName(__FILE__); dir.ReplaceAll("convertCSV.C",""); dir.ReplaceAll("/./","/"); ifstream in; in.open(Form("%stestdata.csv",dir.Data())); Int_t nlines = 20; Int_t n,Alarm101,Alarm102,Alarm103,Alarm104,Alarm105,Alarm106,A…