TGMainFrame::CloseWindow()

Wei Xie (xiewei@ceropa.weizmann.ac.il)
Sat, 2 May 1998 23:43:30 +0200 (EET)


Dear ROOTer's

I'v two files: "tree1.root" and "tree2.root", which contain TTree object
"T" with varible "aa1" and "aa2", respectively. When typing:

** TChain chain("T");
** chain.Add("tree1.root");
** chain.Add("tree2.root");
** chain.Draw("aa1");
** chain.Draw("aa2");

It will draw varible "aa1" successfully but shows the
following messages:

** *ERROR 26 :
** Unknown name : "aa2"

If I change the sequence of adding "tree1.root" and "tree2.root", i.e.

** ...........
** chain.Add("tree2.root");
** chain.Add("tree1.root");
** chain.Draw("aa1");
** chain.Draw("aa2");

It'll shows:

** *ERROR 26 :
** Unknown name : "aa1"

As I understand the TChain should deal with the variable from all the
files in the chain. Is it true that I misunderstand its meaning ?

Sincerely yours

Xie

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Mail:
Department of Particle Physics
Weizmann Institute of Science
Rehovot 76100 ISRAEL
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