Hi Andrea,
If you change your file names from xxx.ntp to xxx.root, your merge procedure
will work. The current interface looks for a string ".root" to find the file
in case you specify the name of a tree inside a file.
Rene Brun
Andrea Fontana wrote:
>
> Dear ROOTers,
> we have two files, each containing two ntuples (named hits and vertex).
> We want to merge them into a single file that will still contain two
> ntuples (that are the sum of the original two).
> We are trying with this code (following the instructions of the reference
> guide):
>
> TChain *fChain=new TChain("fChain");
>
> fChain->Add("/data/ntp/AT-Run3924.ntp/hits");
> fChain->Add("/data/ntp/AT-Run3933.ntp/hits");
> fChain->Add("/data/ntp/AT-Run3924.ntp/vertex");
> fChain->Add("/data/ntp/AT-Run3933.ntp/vertex");
>
> fChain->Merge("temp.ntp");
>
> but we have the following error message:
>
> Error in <TFile::TFile>: file /data/ntp/AT-Run3924.ntp/hits does not exist
> Error in <TFile::TFile>: file /data/ntp/AT-Run3933.ntp/hits does not exist
> Error in <TFile::TFile>: file /data/ntp/AT-Run3924.ntp/vertex does not exist
> Error in <TFile::TFile>: file /data/ntp/AT-Run3933.ntp/vertex does not exist
>
> We are sure that both files and ntuples exist as we can browse them with
> a TBrowser. It looks like ROOT looks for a file called
> /data/ntp/AT-Run3924.ntp/hits and not for an ntuple called hits within the
> file. What do we do wrong?
>
> Many thanks and regards,
> Andrea Fontana & Germano Bonomi
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