Hi Andrei,
Thanks for explaining the conditions when you get the problem.
This turned out to be a stupid problem in TTreeFormula now fixed in
the development version in CVS.
Rene Brun
Andrei Daniel wrote:
>
> Hi Rooters,
>
> Yesterday I asked a question about writing TCutG object
> in the file. I would like to refine it. When TCutG
> object is created and immediately is written in the file
> all works. Problem arises when I use TCutG object
> to make a draw from TTree and then write it in
> the file. On practice, I am interesting to see
> two one-dimensional projections created with
> the same TCutG object before it will be written in
> the file for the future use.
>
> What is a difference between two groups of commands?
>
> //== Common part
> TCanvas c1;
> TCanvas c2;
> TFile Fi("namei", "READ"); //== File with large TTree T
> TFile Fo("nameo", "UPDATE");
> c1.cd();
> Fi.cd();
>
> //== 1st group works
> T.Draw("y:x","x>0&&y>0");
> //== Creation and rename of TcutG using Edit command from canvas
> Fo.cd();
> CUTXY.Write();
>
> //== 2nd group get an error
> T.Draw("y:x","x>0&&y>0");
> //== Creation and rename of TcutG using Edit command from canvas
> c2.cd();
> T.Draw("x","CUTXY");
> htemp.Fit("gaus");
> Fo.cd();
> CUTXY.Write();
>
> I tried to use these commands on the Windows XP for
> the root 3.02.04 and on the Linux SuSE 7.2 for the root
> 3.02.00 with the same result.
>
> Andrei
> ----------------------------------------------
> Andrei Daniel
> FLNR, JINR, Dubna 141980 Russia
> e-mail: daniel@jinr.ru
> tel: 7 (09621) 64568 fax: 7 (09621) 65083
This archive was generated by hypermail 2b29 : Tue Jan 01 2002 - 17:51:10 MET