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
>
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