Hi Robert,
You tried to follow an example showing how to superimpose
two ONE dimensional histograms using two different
vertical scales.
With TWO-dimensional histograms, the x and y axis are part
of the histogram definition & binning. One could think of the
equivalent example by forcing two different Z scales.
I do not think that this is your intention.
I have modified your script to do what I believe you want to do.
Rene Brun
TFile *f1 = new TFile("et0.root");
TNtuple *ntuple1 = (TTree*)f1->Get("et0");
TFile *f2 = new TFile("et4.root");
TNtuple *ntuple2 = (TTree*)f2->Get("et4");
ntuple1->Draw("Xmean:time>>et0x_july", "run_number < 481", "goff");
ntuple2->Draw("Xmean:time>>et4x_july", "run_number < 481", "goff");
// make first plot
et0x_july->SetMarkerColor(4);
et0x_july->GetXaxis()->SetTitle("Unix Time (sec)");
et0x_july->GetYaxis()->SetTitle("X ISR Mean (mm)");
et0x_july->GetYaxis()->CenterTitle();
et0x_july->SetTitle("July XMean (ISR) vs Time");
et0x_july->Draw("p");
// draw 2nd plot
et4x_july->SetMarkerColor(2);
et4x_july->Draw("same");
==================================================================
Robert Lee wrote:
Hello all,
I would like to combine two 2D plots (made from variables
which were stored in two separate ntuples) with the same X axes
and different Y axes on the same pad. I tried to follow the
examples I found in earlier posts, but with no luck.
When running the portion of the macro below, I only
get the first plot displayed. The second axis is generated,
but the scale is not even close to right. I get no errors
reported as well.
// ************************************ //
TFile *f1 = new TFile("et0.root");
TNtuple *ntuple1 = (TTree*)f1->Get("et0");
TFile *f2 = new TFile("et4.root");
TNtuple *ntuple2 = (TTree*)f2->Get("et4");
ntuple1->Draw("Xmean:time>>et0x_july", "run_number < 481");
ntuple2->Draw("Xmean:time>>et4x_july", "run_number < 481");
// make first plot
et0x_july->SetMarkerColor(4);
et0x_july->GetXaxis()->SetTitle("Unix Time (sec)");
et0x_july->GetYaxis()->SetTitle("X ISR Mean (mm)");
et0x_july->GetYaxis()->CenterTitle();
et0x_july->SetTitle("July XMean (ISR) vs Time");
et0x_july->Draw("p");
myCanvas->Update();
// scale 2nd plot correctly
Float_t rightmax = 1.1*et4x_july->GetMaximum();
Float_t scale = gPad->GetUymax()/rightmax;
et4x_july->Scale(scale);
// draw 2nd plot
et4x_july->SetMarkerColor(2);
et4x_july->Draw("same");
// Draw second axis
TGaxis *axis = new TGaxis(gPad->GetUxmax(),gPad->GetUymin(),
gPad->GetUxmax(), gPad->GetUymax(),0,rightmax,510,"+L");
axis->Draw();
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