Hi everyone!
I’m currently working on the ALICE masterclass, trying to build the RAA and RCP code
using the base BuildRAAStudents.C file that’s in the Part2 of the masterclass. When
i try to run the code this warning and error appears to me:
Error in : Trying to dereference null pointer or trying to call routine taking non-null arguments.
Execution of your code was aborted.
/media/estudiantes/BULNES/Seminario/ALICE-DVD/Part2/BuildRAAStudents.C:146:4: warning: null passed to a callee that requires a non-null argument [-Wnonnull]
hTrackPtPbPb_0_5->Scale(1./nColl_0_5);
I’m currently using the last version of ROOT for Ubuntu20.04 ROOT v26/04.
If there someone who know about this problem or how it can be fixed?
It seems “hTrackPtPbPb_0_5
” is uninitialized in your macro. You need to find out why.
Thank WIle_E_Coyote for the response.
I’m trying to figure it out why it’s uninitialized, but i don’t see in the macro why is happening:
//*********************************************************************************
// Start of main function
// parameters:
// * filename - name of the input-file
//*********************************************************************************
void BuildRAAStudents(TString filename = "RAABaseOutput.root"){
//________Reset ROOT_______________________________________________________________
gROOT->Reset();
//________Set basic style setting__________________________________________________
StyleSettings();
cout << "Analysing file " << filename.Data() << endl;
//*********************************************************************************
//Definition of number of Collisions in the different centrality classes
//*********************************************************************************
Double_t nColl_0_5 =1686.87;
Double_t nColl_0_10 = 1502.7;
Double_t nColl_5_10 = 1319.89;
Double_t nColl_10_20 = 923.26;
Double_t nColl_20_30 = 558.68;
Double_t nColl_30_40 = 321.20;
Double_t nColl_40_50 = 171.67;
Double_t nColl_50_60 = 85.13;
Double_t nColl_60_70 = 38.51;
Double_t nColl_70_80 = 15.78;
Double_t nColl_80_90 = 6.32;
//*********************************************************************************
//Attaching & reading the input-file
//*********************************************************************************
TFile fileInput(filename.Data());
//____ reading the number of TPC tracks for pp events & 0-5% PbPb events___________
TH1D *hNTracksTPCPbPb_0_5 = (TH1D*)fileInput.Get(Form("nTracksTPC_PbPb_%i-%i",0,5));
TH1D *hNTracksTPCPbPb_70_80 = (TH1D*)fileInput.Get(Form("nTracksTPC_PbPb_%i-%i",70,80));
/// To do: Do the same for the other centralities
//TH1D *hNTracksTPCPbPb_0_10 = (TH1D*)fileInput.Get(Form("nTracksTPC_PbPb_%i-%i", 0,10));
//TH1D *hNTracksTPCPbPb_5_10 = (TH1D*)fileInput.Get(Form("nTracksTPC_PbPb_%i-%i", 5,10));
//TH1D *hNTracksTPCPbPb_10_20 = (TH1D*)fileInput.Get(Form("nTracksTPC_PbPb_%i-%i", 10,20));
//TH1D *hNTracksTPCPbPb_20_30 = (TH1D*)fileInput.Get(Form("nTracksTPC_PbPb_%i-%i", 20,30));
//TH1D *hNTracksTPCPbPb_30_40 = (TH1D*)fileInput.Get(Form("nTracksTPC_PbPb_%i-%i", 30,40));
//TH1D *hNTracksTPCPbPb_40_50 = (TH1D*)fileInput.Get(Form("nTracksTPC_PbPb_%i-%i", 40,50));
//TH1D *hNTracksTPCPbPb_50_60 = (TH1D*)fileInput.Get(Form("nTracksTPC_PbPb_%i-%i", 50,60));
//TH1D *hNTracksTPCPbPb_60_70 = (TH1D*)fileInput.Get(Form("nTracksTPC_PbPb_%i-%i", 60,70));
//TH1D *hNTracksTPCPbPb_80_90 = (TH1D*)fileInput.Get(Form("nTracksTPC_PbPb_%i-%i", 80,90));
//_____reading the pt-spectrum for 0-5% & 70-80% PbPb events, scaling it___________
//_____by corresponding number of Collisions (nColl)_______________________________
TH1D *hTrackPtPbPb_0_5 = (TH1D*)fileInput.Get(Form("trackPt_PbPb_%i-%i",0,5));
hTrackPtPbPb_0_5-> Scale(1./nColl_0_5);
TH1D *hTrackPtPbPb_70_80 = (TH1D*)fileInput.Get(Form("trackPt_PbPb_%i-%i",70,80));
hTrackPtPbPb_70_80-> Scale(1./nColl_70_80);
This is the code so far.
Looks like it cannot find the “trackPt_PbPb_0-5
” histogram in your fileInput
file (“RAABaseOutput.root
”?).
Try: fileInput.ls();
With the fileInput.ls()
; didn’t work, but changing the numbers %i in the (TH1D*)fileInput.Get(Form("nTracksTPC_PbPb_%i-%i",0,5));
with the number in the "RAABaseOutput.root"
shows the Canvas and the first calculations. Thank you for your help!
system
Closed
July 25, 2022, 3:59pm
6
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