How Set axis titles

Newbie
1

Dear experts

I want to set titles of axis, the flow is:

c->cd(4);
        gPad->DrawFrame(-850,-850,850,850);
        DrawCDC();
        hitmap_wireEven->GetXaxis()->SetTitle("X [mm]");
        hitmap_wireEven->GetYaxis()->SetTitle("Y [mm]");
        hitmap_wireEven->SetMarkerStyle(20);
        hitmap_wireEven->SetMarkerSize(0.4);
        hitmap_wireEven->SetMarkerColor(1);
        hitmap_wireEven->Draw("P");

where in DrawCDC() a circle is drawn by TEllipse. However, the title of axises were not set correctly (they don’t exist), how can I set them correctly?

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2

Try:

        c->cd(4);
        gPad->DrawFrame(-850,-850,850,850);
        DrawCDC();
        hitmap_wireEven->SetMarkerStyle(20);
        hitmap_wireEven->SetMarkerSize(0.4);
        hitmap_wireEven->SetMarkerColor(1);
        hitmap_wireEven->Draw("P");
        gPad->Modified();
        gPad->Update();
        hitmap_wireEven->GetXaxis()->SetTitle("X [mm]");
        hitmap_wireEven->GetYaxis()->SetTitle("Y [mm]");
        gPad->Modified();
        gPad->Update();