production/scripts/merge.C

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int merge(TString ntp="", TString fout="", TString f1="", TString f2="", TString f3="", TString f4="", TString f5="")
{
        if (ntp=="" || fout=="" || f1=="")
        {
                cout <<"\nmerge : merges a TTree with certain name from different files to one.\n\n"; 
                cout <<"USAGE: merge(TString ntp, TString outfile, TString filepattern 1, ... TString filepattern 5)\n\n";
                cout <<"   ntp           : name of the TTree.\n";
                cout <<"   outfile       : output file name.\n";
                cout <<"   filepattern 1 : 1st file pattern.\n";
                cout <<"   filepattern 2 : 2nd file pattern (optional).\n";
                cout <<"   ...\n";
                cout <<"   filepattern 2 : 5th file pattern (optional).\n\n";
                
                return 0;
        }
        
        TChain n(ntp);
        
        n.Add(f1);
        if (f2!="") n.Add(f2);
        if (f3!="") n.Add(f3);
        if (f4!="") n.Add(f4);
        if (f5!="") n.Add(f5);
        
        n.Merge(fout);
    
        return 0;
}