Hello, I am trying to iterate over the data from a ROOT file produced by Delphes to access the muons from each event and find the invariant mass of a W’ boson. I found it difficult to understand exactly what I am supposed to do to access the leaves of the muon branch of the tree, but based on another post (I am not allowed to include the link as I am a new user) I found an idea of what I may be able to do. I want to print the value to ensure that I have successfully accessed the leaf. However, whether or not I include an integer argument for “GetValue,” if I call
print(tree.GetBranch("Muon").GetLeaf("PT"))
I get “<cppyy.gbl.TLeaf object at 0x(nil)>” for each loop, and if I call
tree.GetBranch("Muon").GetLeaf("PT").Print()
I get “ReferenceError: attempt to access a null-pointer”
get the error “ReferenceError: attempt to access a null-pointer” My code is as follows:
rootfile = TFile.Open("tag_1_delphes_events.root")
tree = rootfile.Get("Delphes")
for eventnumber in range(tree.GetEntries()):
tree.GetEntry(eventnumber)
tree.GetBranch("Muon").GetLeaf("PT").Print()
I would like to know if I am misunderstanding how to access the values stored in these leaves, or if I have otherwise done something wrong. Thank you!
ROOT Version: 6.32.04Platform: UbuntuCompiler: Not Provided
Hello, as an update, I have found that the code
tree.GetLeaf("Muon.Phi").GetValue(0)
Produces a float. However, if the argument to GetValue is any integer other than 0, a value of “0.0” is returned. I was expecting multiple phi values per leaf, as I need to make lorentz vectors out of all of the muons from each event. How can I found the values for the other muons?
pcanal
October 15, 2024, 9:55pm
3
What is the result of tree.GetBranch("Muon").Print()?
Hello, this code returns “OBJ: TLeafElement Muon.Eta Eta[Muon_]” for every loop.
pcanal
October 15, 2024, 9:59pm
5
You only need to print this information once right after retrieving the tree.
That said, it is odd as I would expects more values that just ‘Eta’.
Ok, If I enter what you said right after retrieving the tree, I get the exact same thing, except only one time of course. Is that supposed to happen?
pcanal
October 15, 2024, 10:29pm
7
Is that supposed to happen?
Yes but there should be more than one line. There should be one for Phi, Eta and PT (according to you expectations)
pcanal
October 15, 2024, 10:31pm
8
Actually it is very surprising that tree.GetBranch("Muon").Print() prints anything that says TLeafElement. Either there is a typo in your copy/pasting or your file and/or your installation of ROOT is corrupted.
Hello, I think my expectations of the content of the leaf may have been inaccurate. However, I would still like to make sure nothing is corrupted. Is there any way I can be sure my installation is intact?
pcanal
October 16, 2024, 6:41am
10
On the shell (bash) prompt type:
root.exe -b -l tag_1_delphes_events.root
on the root prompt that appears type:
Delphes->GetBranch("Muon")->Print();
Delphes->Print();
and copy/paste the entire result here.
Hello, this is as much as my terminal will show, and as much as I can paste in
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*Br 259 :Jet.DeltaEta : Float_t DeltaEta[Jet_] *
*Entries : 10000 : Total Size= 59529 bytes File Size = 24783 *
*Baskets : 18 : Basket Size= 12800 bytes Compression= 2.37 *
*............................................................................*
*Br 260 :Jet.DeltaPhi : Float_t DeltaPhi[Jet_] *
*Entries : 10000 : Total Size= 59529 bytes File Size = 24679 *
*Baskets : 18 : Basket Size= 12800 bytes Compression= 2.38 *
*............................................................................*
*Br 261 :Jet.Flavor : UInt_t Flavor[Jet_] *
*Entries : 10000 : Total Size= 59485 bytes File Size = 14503 *
*Baskets : 18 : Basket Size= 12800 bytes Compression= 4.05 *
*............................................................................*
*Br 262 :Jet.FlavorAlgo : UInt_t FlavorAlgo[Jet_] *
*Entries : 10000 : Total Size= 59573 bytes File Size = 10551 *
*Baskets : 18 : Basket Size= 12800 bytes Compression= 5.57 *
pcanal
October 16, 2024, 7:52pm
12
As you can see it is a totally different format. So now let’s try just:
root.exe -b -l tag_1_delphes_events.root
on the root prompt that appears type:
Delphes->GetBranch("Muon")->Print();
Hello, here is the output
*Br 0 :Muon : Int_t Muon_ *
*Entries : 10000 : Total Size= 96267 bytes File Size = 21846 *
*Baskets : 18 : Basket Size= 64000 bytes Compression= 3.73 *
*............................................................................*
*Br 1 :Muon.fUniqueID : UInt_t fUniqueID[Muon_] *
*Entries : 10000 : Total Size= 64227 bytes File Size = 26900 *
*Baskets : 18 : Basket Size= 12800 bytes Compression= 2.36 *
*............................................................................*
*Br 2 :Muon.fBits : UInt_t fBits[Muon_] *
*Entries : 10000 : Total Size= 75035 bytes File Size = 13774 *
*Baskets : 18 : Basket Size= 14336 bytes Compression= 5.39 *
*............................................................................*
*Br 3 :Muon.PT : Float_t PT[Muon_] *
*Entries : 10000 : Total Size= 64073 bytes File Size = 34421 *
*Baskets : 18 : Basket Size= 12800 bytes Compression= 1.84 *
*............................................................................*
*Br 4 :Muon.Eta : Float_t Eta[Muon_] *
*Entries : 10000 : Total Size= 64095 bytes File Size = 35263 *
*Baskets : 18 : Basket Size= 12800 bytes Compression= 1.80 *
*............................................................................*
*Br 5 :Muon.Phi : Float_t Phi[Muon_] *
*Entries : 10000 : Total Size= 64095 bytes File Size = 35316 *
*Baskets : 18 : Basket Size= 12800 bytes Compression= 1.79 *
*............................................................................*
*Br 6 :Muon.T : Float_t T[Muon_] *
*Entries : 10000 : Total Size= 64051 bytes File Size = 33917 *
*Baskets : 18 : Basket Size= 12800 bytes Compression= 1.87 *
*............................................................................*
*Br 7 :Muon.Charge : Int_t Charge[Muon_] *
*Entries : 10000 : Total Size= 64161 bytes File Size = 12855 *
*Baskets : 18 : Basket Size= 12800 bytes Compression= 4.93 *
*............................................................................*
*Br 8 :Muon.Particle : TRef Particle[Muon_] *
*Entries : 10000 : Total Size= 107789 bytes File Size = 29468 *
*Baskets : 18 : Basket Size= 18432 bytes Compression= 3.63 *
*............................................................................*
*Br 9 :Muon.IsolationVar : Float_t IsolationVar[Muon_] *
*Entries : 10000 : Total Size= 64293 bytes File Size = 26881 *
*Baskets : 18 : Basket Size= 12800 bytes Compression= 2.36 *
*............................................................................*
*Br 10 :Muon.IsolationVarRhoCorr : Float_t IsolationVarRhoCorr[Muon_] *
*Entries : 10000 : Total Size= 64447 bytes File Size = 26997 *
*Baskets : 18 : Basket Size= 12800 bytes Compression= 2.36 *
*............................................................................*
*Br 11 :Muon.SumPtCharged : Float_t SumPtCharged[Muon_] *
*Entries : 10000 : Total Size= 64293 bytes File Size = 23372 *
*Baskets : 18 : Basket Size= 12800 bytes Compression= 2.72 *
*............................................................................*
*Br 12 :Muon.SumPtNeutral : Float_t SumPtNeutral[Muon_] *
*Entries : 10000 : Total Size= 64293 bytes File Size = 22529 *
*Baskets : 18 : Basket Size= 12800 bytes Compression= 2.82 *
*............................................................................*
*Br 13 :Muon.SumPtChargedPU : Float_t SumPtChargedPU[Muon_] *
*Entries : 10000 : Total Size= 64337 bytes File Size = 12945 *
*Baskets : 18 : Basket Size= 12800 bytes Compression= 4.91 *
*............................................................................*
*Br 14 :Muon.SumPt : Float_t SumPt[Muon_] *
*Entries : 10000 : Total Size= 64139 bytes File Size = 26554 *
*Baskets : 18 : Basket Size= 12800 bytes Compression= 2.39 *
*............................................................................*
*Br 15 :Muon.D0 : Float_t D0[Muon_] *
*Entries : 10000 : Total Size= 64073 bytes File Size = 17547 *
*Baskets : 18 : Basket Size= 12800 bytes Compression= 3.61 *
*............................................................................*
*Br 16 :Muon.DZ : Float_t DZ[Muon_] *
*Entries : 10000 : Total Size= 64073 bytes File Size = 15251 *
*Baskets : 18 : Basket Size= 12800 bytes Compression= 4.15 *
*............................................................................*
*Br 17 :Muon.ErrorD0 : Float_t ErrorD0[Muon_] *
*Entries : 10000 : Total Size= 64183 bytes File Size = 12857 *
*Baskets : 18 : Basket Size= 12800 bytes Compression= 4.93 *
*............................................................................*
*Br 18 :Muon.ErrorDZ : Float_t ErrorDZ[Muon_] *
*Entries : 10000 : Total Size= 64183 bytes File Size = 12857 *
*Baskets : 18 : Basket Size= 12800 bytes Compression= 4.93 *
*............................................................................*
pcanal
October 17, 2024, 6:36am
14
So you file and installation seem fine.
Delphes->Scan("Muon.PT:Muon.Phi:Muon.Eta");
to see if the values are as expected.
Hello, here is the output. I can also type “CR” to continue. By the way, thank you so much for your help so far.
***********************************************************
* Row * Instance * Muon.PT * Muon.Phi * Muon.Eta *
***********************************************************
* 0 * 0 * 39.696361 * -0.155881 * -0.102892 *
* 1 * 0 * * * *
* 2 * 0 * * * *
* 3 * 0 * 35.982986 * -0.862355 * 2.0969297 *
* 4 * 0 * 44.925849 * 2.1534700 * -1.319775 *
* 5 * 0 * 42.285682 * 2.5955460 * 2.1354951 *
* 6 * 0 * 38.849365 * -2.638298 * -1.319055 *
* 7 * 0 * 12.602761 * 0.9293479 * 2.1619093 *
* 8 * 0 * 15.537632 * 2.0701789 * 2.3520808 *
* 9 * 0 * 29.646698 * 2.4929325 * 1.1274005 *
* 10 * 0 * 60.044815 * 1.5655405 * -2.397201 *
* 11 * 0 * 49.321197 * 0.2703219 * 0.1996777 *
* 12 * 0 * 29.067380 * -1.803938 * -0.203558 *
* 13 * 0 * * * *
* 14 * 0 * 49.492897 * -2.851774 * 2.2867436 *
* 15 * 0 * * * *
* 16 * 0 * 46.235496 * -0.031460 * -1.934332 *
* 17 * 0 * * * *
* 18 * 0 * 21.869148 * -1.888595 * -2.097748 *
* 19 * 0 * 25.905805 * -1.082460 * 0.9844084 *
* 20 * 0 * * * *
* 21 * 0 * * * *
* 22 * 0 * 37.931583 * -0.184949 * 0.1010477 *
* 23 * 0 * * * *
* 24 * 0 * * * *
pcanal
October 17, 2024, 9:55pm
16
This confirms that for the first 24 entries there is only zero or one Muon per entries.
pcanal
October 18, 2024, 9:36am
17
To get the number element try:
countval = int()
tree.GetLeaf("Muon.Phi").GetLeafCount(countval);
Hello, everything is actually working now. I generated another collision with madgraph just to make sure, and this time, there are as many muons as I would expect. I’m not sure why it worked, but thank you so, so much for all your help.