Hallo Mario, This will work : > TFile fin("run1411_1.root"); TH1F *h2 = new TH1F("h2","h2",100,0,500); > h1->Draw("adc0>>h2"); TFile fout("hv.root","RECREATE"); > h1->Write(); > fout.Close(); > Maybe the problem is that root is scanning the current directory to decide if Tree::Draw will create the histogram. In your case it was looking in fin. see you, Colin > ==> Output contains empty histo h2, because Draw creates a new one in > fin. > > How can I solve the problem?! > > cheers > > Mario > > > > -- ------------------------------------------------------- -- > * Mario Leberig * > * AG Kabuss CERN * > * Universitaet Mainz EP Division * > * Institut fuer Kernphysik Bat. 892-RA13 * > * D-55099 Mainz 1211 Geneva 23 * > * Tel. +49-6131/39-22932 Tel. +41-22-767-6461 * > * Fax +49-6131/39-22964 Fax +41-22-767-7910 * > -- ------------------------------------------------------- -- >
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