Segmentation fault while plotting from TTree into TH1F*

ROOT
1

Hello!
As stated in the title I have a following problem: when I try to plot my TTree into previously created TH1F I get segmentation fault. My root version is 5.34/23 and below is exact code and output:

Minimal code for error reproduction:

[code]#include
#include <TFile.h>
#include <TTree.h>
#include <Riostream.h>

class Argonaut {

public:
Argonaut();
TH1F* Argonaut::GetFitZ(int event_cuts_changed);

private:
TFile* f_events;
TTree* t_events;

    TCut C_FitZ;

};

Argonaut::Argonaut()
{
string dir = “/home/yourdirectorypath/”;
stringstream ss;
ss.str("");
ss << dir << “/events.root”;
f_events = new TFile(ss.str().c_str());
t_events = (TTree*)f_events->Get(“TreeEvents”);
}

TH1F* Argonaut::GetFitZ()
{
Int_t nbinsx=8000;
Double_t xlow=-800.;
Double_t xup=200.;
TH1F *hist = new TH1F(“fitz”,“Main Vtx Z-pos”,nbinsx,xlow,xup);

    t_events->Print();
    t_events->Draw("FitZ>>fitz","","");
    return hist;

}

void Execute()
{
Argonaut test;
test.GetFitZ()->Draw();
}[/code]

Output:
[size=85][code]

*Tree :TreeEvents: Event characteristics *
*Entries : 2400 : Total = 575269 bytes File Size = 463208 *

  •    :          : Tree compression factor =   1.24                       *

*Br 0 :evN : EventIndex/I *
*Entries : 2400 : Total Size= 10163 bytes File Size = 3579 *
*Baskets : 1 : Basket Size= 32000 bytes Compression= 2.70 *
…
*Br 1 :S5 : S5/I *
*Entries : 2400 : Total Size= 10137 bytes File Size = 2323 *
*Baskets : 1 : Basket Size= 32000 bytes Compression= 4.16 *
…
*Br 2 :FitZ : FitZ/F *
*Entries : 2400 : Total Size= 10147 bytes File Size = 6366 *
*Baskets : 1 : Basket Size= 32000 bytes Compression= 1.52 *
…
*Br 3 :WFA : vector *
*Entries : 2400 : Total Size= 62010 bytes File Size = 14113 *
*Baskets : 3 : Basket Size= 32000 bytes Compression= 4.36 *
…
*Br 4 :PSD : PSDModulesArray[44]/F *
*Entries : 2400 : Total Size= 424074 bytes File Size = 382763 *
*Baskets : 14 : Basket Size= 32000 bytes Compression= 1.11 *
…
*Br 5 :BPD : BPDPlanesArray[6]/F *
*Entries : 2400 : Total Size= 58257 bytes File Size = 52882 *
*Baskets : 2 : Basket Size= 32000 bytes Compression= 1.09 *
…

*** Break *** segmentation violation
[/code][/size]

Do you have any idea what might be a source of the problem?
I already was given an answer, that it might be due to deleting a histogram along with the file. But I cannot really figure it out.
Necessary file is in the attachment.

Regards,
Maciej Lewicki
events.root (458 KB)

2

Always try to precompile your macro using ACLiC, in order to find source code problems, e.g. try something like:
root [0] .L MyMacro.cxx++

[code]#include “TH1.h”
#include “TFile.h”
#include “TTree.h”
#include “TCut.h”

#include
#include
// …
public:
Argonaut();
TH1F *GetFitZ();
// …[/code]

3

Problem solved. Thank you!