Hello Rene, Can you elaborate whether a new share library is linked against of any CERNLIB libraries Since many ROOT-based our application need CERNLIB as well including a share library that is linked with CERNLIB may cause some "side effect" we would like to avoid. Thank you, Valeri ----- Dr.Valeri Fine STAR/US Atlas E-mail: fine@bnl.gov Brookhaven National Lab Phone: +1 631 344 7806 Upton, NY 11973-5000 FAX: +1 631 344 4206 USA ----- Original Message ----- From: "Rene Brun" <Rene.Brun@cern.ch> To: <roottalk@pcroot.cern.ch>; <pclark@SLAC.stanford.edu> Sent: Wednesday, February 20, 2002 12:58 PM Subject: [ROOT] Hbook/PAW files now readable from ROOT > Dear Rooters, > > A set of classes allowing to read directly Hbook files in ROOT > are now available in the CVS development version. The classes are: > -THbookFile: an Hbook file object > -THbookTree: an Hbook Ntuple (Row or Column-Wise) > -THbookBranch: an ntuple column > -THbookKey: service class to browse Hbook directories > The new classes are in a separate optional shared lib libHbook.so > > With these classes, one can: > - import automatically any 1-d, 2-d or profile histograms. The Hbook types > are converted on the fly to Root types TH1F, TH2F and TProfile. > > - import ntuple headers (Row or Column-Wise). > A new data type THbookTree (deriving from TTree) with functions like > hbookTree.Draw("x","selection") like for a normal TTree. The ntuple data > are read directly from the Hbook file. > > - The Tree viewer can be used directly: hbookTree.StartViewer(); > > - Browse the THbookFile via TBrowser. Clicking on a Hbook ID in a file > draws the histogram. > > - When in the browser, the context menu item "Convert2root" can be selected > to convert a THbookFile into a normal TFile (via h2root). The converted file > is by default connected to the browser. > > Example: > gSystem->Load("libHbook"); > THbookFile f("myfile.hbook"); > f.ls(); > TH1F *h1 = (TH1F*)f.Get(1); //import histogram ID=1 in h1 > h1->Fit("gaus"); > THbookTree *T = (THbookTree*)f.Get(111); //import ntuple header > T->Print(); //show the Hbook ntuple variables > T->Draw("x","y<0"); // as in normal TTree::Draw > T->StartViewer(); > > I have tested these classes on several Hbook files containing histograms > and ntuples of various complexity. > > Note that a THbookFile is a read only file. > > I would appreciate feedback on these classes. > > Rene Brun >
This archive was generated by hypermail 2b29 : Sat Jan 04 2003 - 23:50:42 MET