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ROOT Version: Not ProvidedPlatform: Not ProvidedCompiler: Not Provided
I am trying to store date and time data in tree.
TFile f("tree3.root","recreate");
TTree *t3 = new TTree("t3","Reconst ntuple");
fstream soc;
soc.open("Time.txt", ios::in);
t3->Branch("date_time",date_time,"date_time");
string time;
while(i<=10)
{
if(soc.eof()) break;
getline(soc, time);
cout << time << endl;
date_time[i] = time;
t3->Fill();
l=++l;
//cout << date_time[i] << endl;
}
This is what Time.txt file looks like
2023/08/07 17:33:31.649
2023/08/07 17:33:32.192
2023/08/07 17:33:33.604
2023/08/07 17:33:41.852
2023/08/07 17:33:43.374
2023/08/07 17:33:47.833
2023/08/07 17:33:58.806
2023/08/07 17:34:01.200
2023/08/07 17:34:02.940
2023/08/07 17:34:03.810
2023/08/07 17:34:06.637
2023/08/07 17:34:09.569
2023/08/07 17:34:13.587
2023/08/07 17:34:14.896
2023/08/07 17:34:20.247
2023/08/07 17:34:23.637
2023/08/07 17:34:23.963
2023/08/07 17:34:24.618
2023/08/07 17:34:30.838
2023/08/07 17:34:36.295
2023/08/07 17:34:37.607
2023/08/07 17:34:38.915
When I cout time, I get the time information in the txt file, but when I make date_time[i] to transfer it to tree, it does not work. cout of date_time[I] appears blank in terminal.
Danilo
November 8, 2023, 10:16pm
2
Hi,
I think an efficient way to achieve this is through RDataFrame:
std::fstream soc;
soc.open("Time.txt", ios::in);
std::string time;
std::vector<std::string> time_v;
time_v.reserve(128);
while ( std::getline(soc, time) ) time_v.emplace_back(time);
auto df = ROOT::RDataFrame(time_v.size()).Define("date_time", [&time_v](ULong64_t entry){return time_v[entry];}, {"rdfentry_"});
df.Snapshot<std::string>("t3","tree3.root",{"date_time"});
Let us know how this go!
Cheers,
couet
November 9, 2023, 7:17am
3
To read the two columns as strings you can also do:
root [0] auto T = new TTree()
root [1] T->ReadFile("Time.txt","date/C:time/C")
root [2] T->Scan()
************************************
* Row * date.date * time.time *
************************************
* 0 * 2023/08/0 * 17:33:31. *
* 1 * 2023/08/0 * 17:33:32. *
* 2 * 2023/08/0 * 17:33:33. *
* 3 * 2023/08/0 * 17:33:41. *
* 4 * 2023/08/0 * 17:33:43. *
* 5 * 2023/08/0 * 17:33:47. *
* 6 * 2023/08/0 * 17:33:58. *
* 7 * 2023/08/0 * 17:34:01. *
* 8 * 2023/08/0 * 17:34:02. *
* 9 * 2023/08/0 * 17:34:03. *
* 10 * 2023/08/0 * 17:34:06. *
* 11 * 2023/08/0 * 17:34:09. *
* 12 * 2023/08/0 * 17:34:13. *
* 13 * 2023/08/0 * 17:34:14. *
* 14 * 2023/08/0 * 17:34:20. *
* 15 * 2023/08/0 * 17:34:23. *
* 16 * 2023/08/0 * 17:34:23. *
* 17 * 2023/08/0 * 17:34:24. *
* 18 * 2023/08/0 * 17:34:30. *
* 19 * 2023/08/0 * 17:34:36. *
* 20 * 2023/08/0 * 17:34:37. *
* 21 * 2023/08/0 * 17:34:38. *
************************************
root [3]
I am working with the code you wrote. But I couldn’t get it to work.
/Users/kaan/Desktop/Cosmic/bos1.C:34:1: error: non-void function does not return a value [-Werror,-Wreturn-type]
}
^
root.exe(3608,0x112a9fdc0) malloc: *** error for object 0x7fff682df385: pointer being freed was not allocated
root.exe(3608,0x112a9fdc0) malloc: *** set a breakpoint in malloc_error_break to debug
I think root works and creates the tree file, but I see errors in all the files.
