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"source": [
"# hist010_TH1_two_scales\n",
"with different scales in the \"same\" pad.\n",
"\n",
"\n",
"\n",
"\n",
"**Author:** Rene Brun \n",
"This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Tuesday, May 19, 2026 at 08:12 PM."
]
},
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"outputs": [],
"source": [
"TCanvas *c1 = new TCanvas(\"c1\", \"hists with different scales\", 600, 400);"
]
},
{
"cell_type": "markdown",
"id": "64df84fe",
"metadata": {},
"source": [
"create/fill draw h1"
]
},
{
"cell_type": "code",
"execution_count": 2,
"id": "f267881f",
"metadata": {
"collapsed": false,
"execution": {
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"source": [
"gStyle->SetOptStat(kFALSE);\n",
"TH1D *h1 = new TH1D(\"h1\", \"my histogram\", 100, -3, 3);\n",
"TRandom3 rng;\n",
"for (int i = 0; i < 10000; i++)\n",
" h1->Fill(rng.Gaus(0, 1));\n",
"h1->Draw();\n",
"c1->Update();"
]
},
{
"cell_type": "markdown",
"id": "348fa85b",
"metadata": {},
"source": [
"create hint1 filled with the bins integral of h1"
]
},
{
"cell_type": "code",
"execution_count": 3,
"id": "8061b7bb",
"metadata": {
"collapsed": false,
"execution": {
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"shell.execute_reply": "2026-05-19T20:12:06.762096Z"
}
},
"outputs": [],
"source": [
"TH1D *hint1 = new TH1D(\"hint1\", \"h1 bins integral\", 100, -3, 3);\n",
"double sum = 0;\n",
"for (int i = 1; i <= 100; i++) {\n",
" sum += h1->GetBinContent(i);\n",
" hint1->SetBinContent(i, sum);\n",
"}"
]
},
{
"cell_type": "markdown",
"id": "bf1bd7a8",
"metadata": {},
"source": [
"scale hint1 to the pad coordinates"
]
},
{
"cell_type": "code",
"execution_count": 4,
"id": "f16b6824",
"metadata": {
"collapsed": false,
"execution": {
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"shell.execute_reply": "2026-05-19T20:12:06.966857Z"
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},
"outputs": [],
"source": [
"double rightmax = 1.1 * hint1->GetMaximum();\n",
"double scale = gPad->GetUymax() / rightmax;\n",
"hint1->SetLineColor(kRed);\n",
"hint1->Scale(scale);\n",
"hint1->Draw(\"same\");"
]
},
{
"cell_type": "markdown",
"id": "3dce5b98",
"metadata": {},
"source": [
"draw an axis on the right side"
]
},
{
"cell_type": "code",
"execution_count": 5,
"id": "74c6fda5",
"metadata": {
"collapsed": false,
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"shell.execute_reply": "2026-05-19T20:12:07.188763Z"
}
},
"outputs": [],
"source": [
"TGaxis *axis =\n",
" new TGaxis(gPad->GetUxmax(), gPad->GetUymin(), gPad->GetUxmax(), gPad->GetUymax(), 0, rightmax, 510, \"+L\");\n",
"axis->SetLineColor(kRed);\n",
"axis->SetLabelColor(kRed);\n",
"axis->Draw();"
]
},
{
"cell_type": "markdown",
"id": "8cea851f",
"metadata": {},
"source": [
"Draw all canvases "
]
},
{
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],
"source": [
"gROOT->GetListOfCanvases()->Draw()"
]
}
],
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