Hi Volodja,
Sorry for this late reply.
What you do should work with the pro version 3.04/02.
If you want to work with the old version, you should import
your histograms from the ROOT file with, eg
TH1 *h8a1_10 = f.Get("h8a1_10");
Rene Brun
On Thu, 26 Dec 2002 babintsev@mx.ihep.su wrote:
>
> Hello
> I have the following problem (root version 3.01)
>
> root [53] h8a1_10.Draw() - ok
> root [54] h8a1_16.Draw() - ok
>
> root [61] h8a1_10.Add(h8a1_16,-c)
> Error: No symbol h8a1_16 in current scope FILE:/tmp/fileX4fNGn_cint LINE:1
> *** Interpreter error recovered ***
> root [62] h8a1_10.Add(&h8a1_16,-c)
> Error: No symbol h8a1_16 in current scope FILE:/tmp/fileX4fNGn_cint LINE:1
> *** Interpreter error recovered ***
>
> root [78] TH1F* h1 = new TH1F
> root [79] TH1F* h2 = new TH1F
> root [80] h1 = h8a1_10
> (class TH1F*const)0x8b82920
> root [81] h2 = h8a1_16
> (const class TH1F*const)0x8b84770
> root [82] h1.Draw()
> root [83] h1.Add(h2,-c)
> root [84] h1.Draw() - ok
>
> why I cannot use the first names ?
>
>
>
>
> Volodja Babintsev
>
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