Dear Root,
I am slightly puzzled by a little macro. When I execute the lines one by one
from the command line, all is well, when I wrap them in a macro, load it,
and execute them as a function, I don't get the axes of the (empty) 2D
histogram. See code below. What is wrong here?
It seems that when the histogram is defined as TH2F Grid(...) it does not
work, while TH2F *Grid=new TH2F(...) does.
While you may argue the second is better, the first should work. It does
when typed into the commandline one by one.
Cheers,
Maurik
--------------- Do_It.C -----------------------
void Do_It(void){
TCanvas *c1 = new TCanvas("c1","E2 Target Momentum Loss",10,10,700,750);
c1->SetFillColor(42);
c1->SetGridx();
c1->SetGridy();
c1->GetFrame()->SetFillColor(21);
c1->GetFrame()->SetBorderSize(12);
TPad *pad = new TPad("pad","E2CellsGraph",0.03,0.03,0.97,0.97,21);
pad->Draw();
pad->cd();
// OK: TH2F *Grid=new TH2F("Grid","Comparison of Momentum Loss Curves for
E2 Targets",100,0.,4.,100,0.0,12.);
TH2F Grid("Grid","Comparison of Momentum Loss Curves for E2
Targets",100,0.,4.,100,0.0,12.);
gStyle->SetOptStat(0);
pad->SetGridx();
pad->SetGridy();
// OK: Grid->Draw();
Grid.Draw();
pad->Modified();
Int_t n1 = 10;
Float_t x1[] = {-0.22, 0.05, 0.25, 0.35, 0.5, 0.61,0.7,0.85,0.89,0.95};
Float_t y1[] = {1,2.9,5.6,7.4,9,9.6,8.7,6.3,4.5,1};
Float_t ex1[] = {.05,.1,.07,.07,.04,.05,.06,.07,.08,.05};
Float_t ey1[] = {.8,.7,.6,.5,.4,.4,.5,.6,.7,.8};
gr1 = new TGraphErrors(n1,x1,y1,ex1,ey1);
gr1->SetMarkerColor(kBlue);
gr1->SetMarkerStyle(21);
gr1->Draw("LP");
pad->Modified();
}
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