Logscales

Draw parametric functions with log scales.

Author: Olivier Couet
This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Tuesday, May 24, 2022 at 03:57 PM.

In [1]:
TCanvas *c1 = new TCanvas("c1", "Various options on LOG scales plots",0,0,700,900);
c1->SetFillColor(30);

TPad *pad1 = new TPad("pad1","pad1",0.03,0.62,0.50,0.92,32);
TPad *pad2 = new TPad("pad2","pad2",0.51,0.62,0.98,0.92,33);
TPad *pad3 = new TPad("pad3","pad3",0.03,0.02,0.97,0.535,38);
pad1->Draw(); pad2->Draw(); pad3->Draw();

TPaveLabel *title = new TPaveLabel(0.1,0.94,0.9,0.98, "Various options on LOG scales plots");
title->SetFillColor(16);
title->SetTextFont(42);
title->Draw();

TPaveText *pave = new TPaveText(0.1,0.55,0.9,0.61);
pave->SetFillColor(42);
pave->SetTextAlign(12);
pave->SetTextFont(42);
pave->AddText("When more Log labels are requested, the overlapping labels are removed");
pave->Draw();

pad1->cd();
pad1->SetLogy();
pad1->SetGridy();
TF1 *f1 = new TF1("f1","x*sin(x)*exp(-0.1*x)+15",-10.,10.);
TF1 *f2 = new TF1("f2","(sin(x)+cos(x))**5+15",-10.,10.);
TF1 *f3 = new TF1("f3","(sin(x)/(x)-x*cos(x))+15",-10.,10.);
f1->SetLineWidth(1); f1->SetLineColor(2);
f2->SetLineWidth(1); f2->SetLineColor(3);
f3->SetLineWidth(1); f3->SetLineColor(4);
f1->Draw();
f2->Draw("same");
f3->Draw("same");
f1->GetYaxis()->SetMoreLogLabels();
TPaveText *pave1 = new TPaveText(-6,2,6,6);
pave1->SetFillColor(42);
pave1->SetTextAlign(12);
pave1->SetTextFont(42);
pave1->AddText("Log scale along Y axis.");
pave1->AddText("More Log labels requested.");
pave1->Draw();

pad2->cd();
double x[10] = { 200, 300, 400, 500, 600, 650, 700, 710, 900,1000 };
double y[10] = { 200, 1000, 900, 400, 500, 250, 800, 150, 201, 220 };
TGraph *g_2 = new TGraph(10,x,y);
g_2->Draw("AL*");
g_2->SetMarkerColor(2);
g_2->GetYaxis()->SetMoreLogLabels();
g_2->GetYaxis()->SetNoExponent();
pad2->SetLogy();
g_2->GetXaxis()->SetMoreLogLabels();
pad2->SetLogx();
pad2->SetGridx();
TPaveText *pave2 = new TPaveText(150,80,500,180);
pave2->SetFillColor(42);
pave2->SetTextFont(42);
pave2->SetTextAlign(12);
pave2->AddText("Log scale along X and Y axis.");
pave2->AddText("More Log labels on both.");
pave2->AddText("No exponent along Y axis.");
pave2->Draw();

pad3->cd();
pad3->SetGridx();
pad3->SetGridy();
pad3->SetLogy();
pad3->SetLogx();
TF1 *f4 = new TF1("f4a","x*sin(x+10)+25",1,21);
f4->SetLineWidth(1);
f4->Draw();
f4->SetNpx(200);
f4->GetYaxis()->SetMoreLogLabels();
f4->GetXaxis()->SetMoreLogLabels();
f4 = new TF1("f4b","x*cos(x+10)*sin(x+10)+25",1,21);
f4->SetLineWidth(1); f4->Draw("same");
f4->SetNpx(200);
Int_t a = 20;
for (int i=a; i>=1; i--) {
   f4 = new TF1(Form("f4b_%d",i),"x*sin(x+10)*[0]/[1]+25",1,21);
   f4->SetParameter(0,i);
   f4->SetParameter(1,a);
   f4->SetNpx(200);
   f4->SetLineWidth(1); f4->SetLineColor(i+10);
   f4->Draw("same");
   f4 = new TF1(Form("f4c_%d",i),"x*cos(x+10)*sin(x+10)*[0]/[1]+25",1,25);
   f4->SetParameter(0,i);
   f4->SetParameter(1,a);
   f4->SetNpx(200);
   f4->SetLineWidth(1); f4->SetLineColor(i+30); f4->Draw("same");
}
TPaveText *pave3 = new TPaveText(1.2,8,9,15);
pave3->SetFillColor(42);
pave3->AddText("Log scale along X and Y axis.");
pave3->SetTextFont(42);
pave3->SetTextAlign(12);
pave3->AddText("More Log labels on both.");
pave3->AddText("The labels have no exponents (they would be 0 or 1)");
pave3->Draw();

Draw all canvases

In [2]:
gROOT->GetListOfCanvases()->Draw()