Hi,
I am trying to do the following:
(1) Take an existing graph
(2) Set the x and y axis limits outside the data range
(3) SetNdivisions
(4) SetGridy
(5) Set axis titles
I cannot make this work to my satisfaction. I can get the axis ranges
right with a call to TCanvas::DrawFrame. However, I cannot seem to get
the axis titles to draw in this case. I do get gridlines, but calling
SetNdivisions doesn't seem to allow me to modify them. If I don't call
TCanvas::DrawFrame then the x axis cannot be scaled as desired with calls
to TAxis::SetRangeUser or TAxis::SetRange. (Why?). I can scale the y axis
with TGraph::SetMaximum and TGraph::SetMinimum (but why not
TAxis::SetRangeUser?) in this case. Am I going about this all wrong?
Here is my macro:
{
double msize=0.8;
Axis_t xlow=0.5;
Axis_t xhigh=3.5;
Axis_t ylow=0.15;
Axis_t yhigh=0.65;
// electrons
TCanvas* c_e_sep_resolution = new TCanvas("c_e_sep_resolution", "Electron
Resolution");
c_e_sep_resolution->DrawFrame(xlow,ylow,xhigh,yhigh);
g_e_resolution->SetMarkerColor(kGreen);
g_e_resolution->SetMarkerStyle(8);
g_e_resolution->SetMarkerSize(msize);
g_e_resolution->Draw("p");
//g_e_resolution->SetMinimum(ylow);
//g_e_resolution->SetMaximum(yhigh);
//g_e_resolution->GetXaxis()->SetRangeUser(xlow, xhigh);
g_e_resolution->GetHistogram()->SetTitle("");
g_e_resolution->GetXaxis()->SetTitle("#sqrt{ E } (GeV^{1/2})");
g_e_resolution->GetYaxis()->SetTitle("#frac{ #sigma }{ #mu }#sqrt{ E }");
g_e_resolution->GetYaxis()->SetTitleSize(0.05);
g_e_resolution->GetYaxis()->SetNdivisions(520);
c_e_sep_resolution->SetGridy();
gPad->Modified();
// end electrons
}
I use root 3.03/02 on a linux machine with the egcs compiler.
Mike Kordosky
--
Graduate Research Assistant // High Energy Physics Lab
kordosky@hep.utexas.edu // University of Texas at Austin
kordosky@fnal.gov //
ph: (512) 471-8426 (RLM Lab, Office)
(512) 475-8673 (ENS Lab)
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