Tutorial for beginner (TTree::MakeClass TTree::MakeSelector)

Newbie
1

Hello,

I would like to ask if you can recommend me a tutorial for a very beginner?
I received root files with data.
I can already write a simple macro that opens a root file, draw a graph, a histogram, and save it to a new root file.

Now I would like to learn how I can extract numeric data from this file, for example, the largest X value, the average value, etc.

I probably need to learn how to use TTree::MakeClass
TTree::MakeSelector, but I don’t know if this is the simplest way.
Can you recommend me a tutorial for a very beginner?

Cheers

2

See Get Started - ROOT and ROOT Primer - ROOT

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2 Likes
4

Sorry for the too simple question.

I am doing the exercise with https://root.cern.ch/root/html534/guides/users-guide/Trees.html#using-ttreemakeclass
by typing .L libEvent.so
I get error macro libEvent.so not found in path .:/snap/root-framework/928/usr/local/macros

Is written:
if it doesn’t exist type make in $ROOTSYS/test

How to correctly execute make libEvent.so ?

5 
cd $ROOTSYS/test
make -k

will create libEvent.so

6

I didn’t find the location in root_v26.10
$ROOTSYS/test
Should I create $ROOTSYS/test ?

7

When you download the ROOT sources the test directory comes with

9

Thanks a lot for sharing! As someone who’s also just starting out in the world of ROOT analysis, your post is incredibly helpful.

I’ve managed to learn a bit so far, but starting with the basics is essential. And I haven’t even seen the tips on TTree:CloneTree and TTreeReader before. Thanks :slightly_smiling_face:

1 Like
10

Hi everyone! I would like to also get some tutorials for beginners. We recently switched to this framework, and to be honest, I feel lost sometimes. That’s why I’ve decided to join this forum in the first place.
So, if you have any tutorials for beginners, feel free to share.

1 Like
11

Welcome to the ROOT forum

The tuorials are available here: ROOT: Tutorials

To have a globl overview have.a look to the Manual: ROOT Manual - ROOT

Finally the Primer might also help you to start: ROOT Primer - ROOT

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Thanks for the Root tutorials. I find them pretty helpful. Also, if you could share some practical problems to solve, it would be really helpful. But thanks anyway.

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Usually, that’s ROOT users who have practical problems to solve. Expose yours and we will help.

1 Like
14

Thanks for your support. I usually try to play around to solve my problems. But in most cases, I get lost in my steps, and in the end, I have no clue what actually helped me.
But I like to read about problems that people share here, and I’m interested in reading about solutions or sharing my suggestions.

15

I am also a beginner in ROOT. I like video tutorials and I sometimes watch the channel https://www.youtube.com/watch?v=KPz-dNjdx40&list=PLLybgCU6QCGWLdDO4ZDaB0kLrO3maeYAe

Cheers