ROOT] Hbook/PAW files now readable from ROOT
> Hi Valery,
>
> libHbook is linked against a static copy of libkernlib and libpacklib.
>
That's pitty :-( Myself is not aware about any other solutuon though :-)
This means we have to customize it with our custom ROOT version.
Thank you, Valeri
> Cheers, Fons.
>
>
>
> On Wed, 2002-02-20 at 19:46, Valeri Fine wrote:
> > 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
> > >
> --
> Org: CERN, European Laboratory for Particle Physics.
> Mail: 1211 Geneve 23, Switzerland
> E-Mail: Fons.Rademakers@cern.ch Phone: +41 22 7679248
> WWW: http://root.cern.ch/~rdm/ Fax: +41 22 7679480
>
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