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Forum: Medical Applications
Re: Question Brachytherapy example: TG43_relative_dose.C issue (Lara Mason)
Date: 10 Apr, 2018
From: Susanna <Susanna>

Dear Lara,

I executed the example and I did not find any problem.
I list here the steps to undertake:
1) compile the brachytherapy with the analysis component on, e.g.:
> cmake -DWITH_ANALYSIS_USE=ON -DGeant4_DIR=PATH/TO/geant4.10.03 PATH_TO/brachytherapy 
> make
2) run :
./Brachy FlexiSourceMacro.mac  (I suggest to increase the number of events, e.g. 10^6 at least)
The output of the simulation is brachytherapy.root. Check you have it. 
3) root TG43_relative_dose.C
Execute the root macro in the same directory where you have brachytherapy.root. This will generate geant4_dose.txt from reading brachytherapy.root.  
4) Finally you can use the macro compare.C in the directory "comparison" to compare your simulation results to reference data (granero.txt).  Just copy  your geant4_dose.txt in the comparison directory and execute: root comparison.C
To have a statistically meaningful comparison, you need to generate at least 300 million events in the simulation.

I hope this helps you,

Kind Regards,
Susanna



-----Original Message-----
From: Lara Mason <lara.mason@live.com> 
Sent: Tuesday, 10 April 2018 10:30 PM
To: medical_app-g4hn@slac.stanford.edu
Subject: Brachytherapy example: TG43_relative_dose.C issue


*** Discussion title: Medical Applications

Hi experts,

I'm attempting to use the ROOT macro TG43_relative_dose.C to compare to reference data. When I try to run it out of the box I get the error

Processing TG43_relative_dose.C...
input_line_13:2:6: error: member reference type 'TH2F *' is a pointer; did you mean to use '->'?
 (h20.GetXaxis()->GetBinCenter(((*(int*)0x7fff503611d0))))
  ~~~^
     ->
libc++abi.dylib: terminating with uncaught exception of type 
libc++cling::CompilationException: Error evaluating expression 
libc++(h20.GetXaxis()->GetBinCenter(((*(int*)0x7fff503611d0))))

This is complaining about the lines

   Double_t xx_histo = h20.GetXaxis()->GetBinCenter(k);
   Double_t yy_histo = h20.GetYaxis()->GetBinCenter(m);
   Double_t edep_histo=h20.GetBinContent(k, m);

However, when I switch them to

   Double_t xx_histo = h20->GetXaxis()->GetBinCenter(k);
   Double_t yy_histo = h20->GetYaxis()->GetBinCenter(m);
   Double_t edep_histo=h20->GetBinContent(k, m);

And try

root -l TG43_relative_dose.C

again, it just runs indefinitely, returning no output and no errors and never completing.

What am I doing wrong here?

Thanks in advance for your help.

Lara

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