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[tutorials] Rename and comment and modernise graphs tutorials.
Co-authored-by: Daniel P. Astudillo <[email protected]> Co-authored-by: Emanuele Chiamulera <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| /// \file | ||
| /// \ingroup tutorial_graphs | ||
| /// \notebook -js | ||
| /// Create and draw a graph with error bars. If more graphs are needed, see the | ||
| /// [gr03_err2gr.C](https://root.cern/doc/master/gerrors2_8C.html) tutorial | ||
| /// | ||
| /// See the [TGraphErrors documentation](https://root.cern/doc/master/classTGraphErrors.html) | ||
| /// | ||
| /// \macro_image | ||
| /// \macro_code | ||
| /// \author Rene Brun | ||
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| void gr002_err_1gr() { | ||
| TCanvas *c1 = new TCanvas("c1","A Simple Graph with error bars",200,10,700,500); | ||
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| c1->SetGrid(); | ||
| c1->GetFrame()->SetBorderSize(12); | ||
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| // We will use the constructor requiring: the number of points, arrays containing the x-and y-axis values, and arrays with the x- andy-axis errors | ||
| const Int_t n = 10; | ||
| Float_t x[n] = {-0.22, 0.05, 0.25, 0.35, 0.5, 0.61,0.7,0.85,0.89,0.95}; | ||
| Float_t y[n] = {1,2.9,5.6,7.4,9,9.6,8.7,6.3,4.5,1}; | ||
| Float_t ex[n] = {.05,.1,.07,.07,.04,.05,.06,.07,.08,.05}; | ||
| Float_t ey[n] = {.8,.7,.6,.5,.4,.4,.5,.6,.7,.8}; | ||
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| // If all x-axis errors should zero, just provide a single 0 in place of ex | ||
| TGraphErrors *gr = new TGraphErrors(n,x,y,ex,ey); | ||
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| gr->SetTitle("TGraphErrors Example"); | ||
| gr->SetMarkerColor(4); | ||
| gr->SetMarkerStyle(21); | ||
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| // To draw in a new/empty canvas or pad, include the option "A" so that the axes are drawn (leave it out if the graph is to be drawn on top of an existing plot | ||
| gr->Draw("ALP"); | ||
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| c1->Update(); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| /// \file | ||
| /// \ingroup tutorial_graphs | ||
| /// \notebook -js | ||
| /// Create and draw two graphs with error bars, superposed on the same canvas | ||
| /// | ||
| /// We first draw an empty frame with the axes, then draw the graphs on top of it | ||
| /// Note that the graphs should have the same or very close ranges (in both axis), | ||
| /// otherwise they may not be visible in the frame. | ||
| /// | ||
| /// Alternatively, an automatic axis scaling can be achieved via a | ||
| /// [TMultiGraph](https://root.cern/doc/master/classTMultiGraph.html) | ||
| /// | ||
| /// See the [TGraphErrors documentation](https://root.cern/doc/master/classTGraphErrors.html) | ||
| /// | ||
| /// \macro_image | ||
| /// \macro_code | ||
| /// \author Rene Brun | ||
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| void gr003_err_2gr() { | ||
| TCanvas *c1 = new TCanvas("c1","2 graphs with errors",200,10,700,500); | ||
| c1->SetGrid(); | ||
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| // draw a frame to define the range | ||
| TH1F *hr = c1->DrawFrame(-0.4,0,1.2,12); | ||
| hr->SetXTitle("X title"); | ||
| hr->SetYTitle("Y title"); | ||
| c1->GetFrame()->SetBorderSize(12); | ||
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| // create first graph | ||
| // We will use the constructor requiring: the number of points, arrays containing the x-and y-axis values, and arrays with the x- andy-axis errors | ||
| const Int_t n1 = 10; | ||
| Double_t xval1[] = {-0.22, 0.05, 0.25, 0.35, 0.5, 0.61,0.7,0.85,0.89,0.95}; | ||
| Double_t yval1[] = {1,2.9,5.6,7.4,9,9.6,8.7,6.3,4.5,1}; | ||
| Double_t ex1[] = {.05,.1,.07,.07,.04,.05,.06,.07,.08,.05}; | ||
| Double_t ey1[] = {.8,.7,.6,.5,.4,.4,.5,.6,.7,.8}; | ||
| // If all x-axis errors should zero, just provide a single 0 in place of ex1 | ||
| TGraphErrors *gr1 = new TGraphErrors(n1,xval1,yval1,ex1,ey1); | ||
| gr1->SetMarkerColor(kBlue); | ||
| gr1->SetMarkerStyle(21); | ||
| // Since we already have a frame in the canvas, we draw the graph without the option "A" (which draws axes for this graph) | ||
| gr1->Draw("LP"); | ||
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| // create second graph | ||
| const Int_t n2 = 10; | ||
| Float_t xval2[] = {-0.28, 0.005, 0.19, 0.29, 0.45, 0.56,0.65,0.80,0.90,1.01}; | ||
| Float_t yval2[] = {0.82,3.86,7,9,10,10.55,9.64,7.26,5.42,2}; | ||
| Float_t ex2[] = {.04,.12,.08,.06,.05,.04,.07,.06,.08,.04}; | ||
| Float_t ey2[] = {.6,.8,.7,.4,.3,.3,.4,.5,.6,.7}; | ||
| TGraphErrors *gr2 = new TGraphErrors(n2,xval2,yval2,ex2,ey2); | ||
| gr2->SetMarkerColor(kRed); | ||
| gr2->SetMarkerStyle(20); | ||
| gr2->Draw("LP"); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| /// \file | ||
| /// \ingroup tutorial_graphs | ||
| /// \notebook | ||
| /// | ||
| /// This tutorial demonstrates the use of TGraphAsymmErrors to plot a graph with asymmetrical errors on both the x and y axes. | ||
| /// The errors for the x values are divided into low (left side of the marker) and high (right side of the marker) errors. | ||
| /// Similarly, for the y values, there are low (lower side of the marker) and high (upper side of the marker) errors. | ||
| /// | ||
| /// \macro_image | ||
| /// \macro_code | ||
| /// | ||
| /// \author Miro Helbich | ||
|
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| void gr004_err_asym() { | ||
| TCanvas *c2 = new TCanvas("c2","", 700, 500); | ||
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| c2->SetGrid(); | ||
| const Int_t npoints=3; | ||
| Double_t xaxis[npoints] = {1.,2.,3.}; | ||
| Double_t yaxis[npoints] = {10.,20.,30.}; | ||
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| Double_t exl[npoints] = {0.5,0.2,0.1}; //Lower x errors | ||
| Double_t exh[npoints] = {0.5,0.3,0.4}; //Higher x errors | ||
| Double_t eyl[npoints] = {3.,5.,4.}; //Lower y errors | ||
| Double_t eyh[npoints] = {3.,5.,4.}; //Higher y errors | ||
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| TGraphAsymmErrors *gr = new TGraphAsymmErrors(npoints,xaxis,yaxis,exl,exh,eyl,eyh); //Create the TGraphAsymmErrors object with data and asymmetrical errors | ||
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| gr->SetTitle("A simple graph with asymmetrical errors"); | ||
| gr->Draw("A*"); //"A" = draw axes and "*" = draw markers at the points with error bars | ||
| } |
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