Hi Andrew,
Philippe canal is correctly reminding me that we already made a change
in TString to correctly support a call to TTree::Draw(TString,
TString,,)
If you upgrade your version of Root to the official release 2.22/10
your program should work.
Thanks Philippe.
Rene Brun
Andrew Askew (padley) wrote:
>
> Hi Root people,
>
> I have a macro that was written for ROOT on the NT. This macro utilizes
> two global TStrings that are set by the user prior to calling the macro.
> The macro then attempts to use these strings as the arguments in a call to
> TTree::Draw(), one argument for the variable, one for the cut. This
> yields no problem on the NT machine, but on the Linux (RedHad 5.2, using
> ecgs 1.0.3, and Root 2.21/01) this generates an error:
> TString varname = "x"
> TString cut = "D>.3"
> //macro begins
> {
> // sample routine to plot the results
>
> c1 = new TCanvas("PDE:Results","PDE Results",131,0,698,830);
> Pad1 = new TPad("Signal","Signal",0.0341297,0.538576,0.464164,0.970326,21);
> Pad2 = new TPad("Background","Background",0.520478,0.540059,0.950512,0.974777,21);
> Pad3 = new TPad("Test","Test",0.0307167,0.074184,0.460751,0.5,21);
> Pad4 = new TPad("pad4","The Surface",0.518771,0.075667,0.947099,0.50,21);
> c1->Draw();
> Pad1->Draw();
> Pad2->Draw();
> Pad3->Draw();
> Pad1->cd();
> cout << varname << endl;
> cout << cut << endl;
> pdeSignalResult->Draw(varname,cut);
> ...
>
> Where pdeSignalResult is a TTree that contains the variable x.
> It is this last line that generates the error:
> Error: Can't call TTree::Draw() in current scope
> FILE:plotit.C LINE:16
> *** Interpreter error recovered ***
>
> Thanks,
> Andrew Askew
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