Please provide more information, in particular extend
the "I get error ..." to something more useful.
Note that instead of:
TH2D* TwoHisto = File1->Get("h2");
you should do:
TH2D* TwoHisto = (TH2D*)File1->Get("h2");
Rene Brun
On Thu, 10 Oct 2002 kmakonyi@nist.gov wrote:
> Dear RooTers,
>
> It is possible a very beginner question, but I don't know the solution.
> I have several directory. All of them contains many data, which are analized
> directory by directory, so after the analysis in every directory conains a root
> file also.
> In the root files there are two histogram.
> I would need to the "same" histogram from every directory.
>
> The problem is, if I do this:
> {
> TFile* File1 = new TFile("one.root");
> TH2D* OneHisto = File1->Get("h2");
>
> TFile* File12 = new TFile("two.root");
> TH2D* TwoHisto = File1->Get("h2");
>
> cout << OneHisto->GetNbinsX();
> }
>
> I get error ...
>
> What can I do, What do I do wrong?
> Thanks, k.
>
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