[ROOT] How toinstantiate a TH1D from a TProfile object

From: Isard_Dunietz (dunietz@fnal.gov)
Date: Sun Dec 24 2000 - 05:33:23 MET 

Happy holidays to you and all the rooters, and thank you for 
your prompt answers, which are very helpful.

Question:
   I would want to instantiate a TH1D object from a TProfile object.
Since TProfile inherits from TH1D, I thought that the 
conventional copy constructor of  TH1D should work just fine: such
as in the code below, but there occured a segmentation violation.
How do I instantiate a new TH1D object by copying the TH1D piece of a 
TProfile object?:

This code below did not work:

root [7] sumProf
(class TProfile)141811200
root [8] TH1D sum( sumProf );

 *** Break *** segmentation violation
Root > 


****************************
so I tried something else, which also did not work:

root [2] TH1D sum;
root [4] avgProf
(class TProfile)141394304
root [5] sum                                   
(class TH1D)141817264
root [6] sum = static_cast<TH1D> ( avgProf );  

 *** Break *** segmentation violation
Root > 

    Thank you for your guidance here.   Happy new year.  Cheers, Isi

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