Hi Bill,
When you use the syntax
tree.Draw("y:x>hist",...)
TTree::Draw searches in the current directory for an object named "hist"
In your case, the cd doest not contain this object because you opened
a new file between the creation of the TProfile and the tree.Draw command.
Move the creation of TProfile after opening the TFile.
Rene Brun
On Fri, 8 Dec 2000, William Love wrote:
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> > Message-ID: <000901c06159$3f637480$5158c782@star.bnl.gov>
> > From: "William Love" <love@bnl.gov>
> > To: "roottalk" <roottalk@hpsalo.cern.ch>
> > Subject: Trying to fill a TProfile from a TTree
> > Date: Fri, 8 Dec 2000 15:55:49 -0500
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> > Rooting squad
> > I don't seem to make contact in a macro between a defined TProfile and
> > the TProfile output of a TTree->Draw. It works from the CINT command
> > line but not from the following Macro. What am I doing wrong?
> > Bill Love
> >
> > void Profile98ExB(const Char_t * filename="R1243037Ev98ExB.root") {
> > char selection[200];
> > c1 = new TCanvas("c1","Profile",200,10,700,500);
> > TProfile *h1 = new TProfile("h1","dx vs row ExB
> > Corrected",45,0.5,45.5,-2.5,2.5,"");
> > // open the root input file.
> > TString file("/star/rcf/scratch/love/roots/");
> > file += filename;
> > cout << "Read file "<< file << endl;
> > TFile f(file->Data());
> > TTree *laser = (TTree*)f.Get("laser"); //Req'd by standard C++
> > // Int_t entr = laser->GetEntries();
> > // laser->SetEstimate(entr);
> > sprintf(selection,"fHits.ftknfit>25");
> >
> >
> laser->Draw("fHits.fdx*sign(ftkinvp):fHits.frow%100>>h1",selection,"prof");
> >
> > }
> >
> >
> >
> >
>
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