How do I print the data to a text file from the output tree?

Newbie
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1

Hello, I need help.
I need to print out a txt file with the values X Y Z Plane Bar Position Time. The data is taken from the output tree. Each event’s time of flight will have a start and end point with coordinates (X Y Z Plane Bar Position Time) (I have a sample result similar to what I want).
I’ve tried and tried to follow so many similar things like that, but couldn’t get any.
Please help me to get it.

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f6f3065e-1a8d-4d59-b2a3-35b092d9abc11350×685 95.1 KB

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8bacb85d-cf79-4ff3-aeb8-727e9a9cdc731366×768 111 KB

2

Hi,

Welcome to the ROOT Community.
There are several ways in which you can achieve this.
One could be via RDataFrame::Foreach. Suppose to have a file called myfile.root containing a TTree tree containing 3 columns x, y, and z of type float:

ROOT::RDataFrame d("tree", "myfile.root");
d.Foreach([](float x, float y, float z){ cout << x << " " << y << " " << z << endl;},{"x", "y", "z"});

In PyROOT, that could be:

import ROOT
myfile = TFile("myfile.root")
for evt in myfile.tree:
    print("%s %s %s" %(evt.x, evt.y, evt.z))

Cheers,
D

3

Thank you so much

4

You can also achieve it using TTree::SetScanField(0); TTree::Scan()
See ROOT: TTreePlayer Class Reference