Hi Guy,
Replace
TFile BF("/home/rshneor/bbtreefile.root");
by
TFile *BF = new TFile("/home/rshneor/bbtreefile.root");
Otherwise, when exiting from your named script DispBar, the BF object
is deleted together with all objects like histograms associated with it.
Please read Users Guide page 93
Rene Brun
Guy Ron wrote:
>
> Hi All,
> I need to plot some histograms from a ROOT File, to do so I use a function
> as follows:
> void DispBar(int plane,int bar)
> {
>
> c1=new TCanvas();
> TFile BF("/home/rshneor/bbtreefile.root");
> TTree *BT=(TTree *)BF.Get("bbtree");
> if (plane==0) {
>
> printf("AUX Plane Bar: %i\n",bar);
> } else if (plane==1) {
>
> printf("DE Plane Bar: %i\n",bar);
>
> } else if (plane==2) {
>
> sprintf(dummy,"E Plane Channel %i TDC Left",bar);
> TH1F tdcl("tdcl",dummy,100,0,2000);
> sprintf(dummy,"E Plane Channel %i TDC Right",bar);
> TH1F tdcr("tdcr",dummy,100,0,2000);
> sprintf(dummy,"E Plane Channel %i ADC Left",bar);
> TH1F adcl("adcl",dummy,100,0,2000);
> sprintf(dummy,"E Plane Channel %i ADC Right",bar);
> TH1F adcr("adcr",dummy,100,0,100);
>
> c1->Divide(2,2);
> sprintf(dummy,"BB.tp.e.lt.data[%i]>>tdcl",bar-1);
> sprintf(dummy1,"BB.tp.e.lt.data[%i]>0",bar-1);
> c1->cd(1);
> BT->Draw(dummy,dummy1);
>
> c1->cd(2);
> sprintf(dummy,"BB.tp.e.rt.data[%i]>>tdcr",bar-1);
> BT->Draw(dummy);
> c1->cd(3);
> sprintf(dummy,"BB.tp.e.la.data[%i]>>adcl",bar-1);
> BT->Draw(dummy);
> c1->cd(4);
> sprintf(dummy,"BB.tp.e.ra.data[%i]>>adcr",bar-1);
> printf(dummy);
> BT->Draw(dummy);
>
> }
> }
>
> The problem is that I get blank pads in the canvas... When I try to plot
> from the tree without the redirection to the histograms everything works
> fine, however, when I try the same code (with the redirection) in the
> interpreter it also works fine.
>
> Any help you can offer would be greatly appreciated.
>
> Thanks,
> Guy Ron
> Tel Aviv University
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