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"source": [
"# gr014_polar3\n",
"See the [TGraphPolar documentation](https://root.cern/doc/master/classTGraphPolar.html)\n",
"\n",
"Since TGraphPolar is a TGraphErrors, it is painted with\n",
"[TGraphPainter](https://root.cern/doc/master/classTGraphPainter.html) options.\n",
"\n",
"\n",
"\n",
"**Author:** Olivier Couet \n",
"This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Tuesday, May 19, 2026 at 08:38 PM."
]
},
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"shell.execute_reply": "2026-05-19T20:38:04.256680Z"
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"source": [
"TCanvas *CPol = new TCanvas(\"CPol\",\"TGraphPolar Examples\",500,500);\n",
"\n",
"Double_t rmin = 0;\n",
"Double_t rmax = TMath::Pi()*2;\n",
"Double_t r[1000];\n",
"Double_t theta[1000];\n",
"\n",
"TF1 *fp1 = new TF1(\"fplot\",\"cos(x)\",rmin,rmax);\n",
"for (Int_t ipt = 0; ipt < 1000; ipt++) {\n",
" r[ipt] = ipt*(rmax-rmin)/1000+rmin;\n",
" theta[ipt] = fp1->Eval(r[ipt]);\n",
"}\n",
"\n",
"TGraphPolar *grP1 = new TGraphPolar(1000, r, theta);\n",
"grP1->SetTitle(\"\");\n",
"grP1->SetLineColor(2);\n",
"grP1->Draw(\"AOL\");"
]
},
{
"cell_type": "markdown",
"id": "30390b15",
"metadata": {},
"source": [
"Draw all canvases "
]
},
{
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"execution_count": 2,
"id": "4d1164fc",
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"shell.execute_reply": "2026-05-19T20:38:04.479710Z"
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"source": [
"gROOT->GetListOfCanvases()->Draw()"
]
}
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