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"# hsumanim\n",
"This script is a slightly modified version of hsum.C.\n",
"\n",
"Uncomment the two `c1->Print(...);` lines in order to produce\n",
"an animated gif file. The option \"++\" makes an infinite animation.\n",
"The animated file `hsumanim.gif` can be visualized within a web browser\n",
"\n",
"\n",
"\n",
"\n",
"**Author:** Rene Brun, Valeriy Onuchin \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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"auto c1 = new TCanvas(\"c1\", \"The HSUM example\", 200, 10, 600, 400);\n",
"c1->SetGrid();\n",
"\n",
"gBenchmark->Start(\"hsum\");"
]
},
{
"cell_type": "markdown",
"id": "d1649af3",
"metadata": {},
"source": [
"Create some histograms."
]
},
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"id": "0e6e1df4",
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"source": [
"auto total = new TH1F(\"total\", \"This is the total distribution\", 100, -4, 4);\n",
"auto main = new TH1F(\"main\", \"Main contributor\", 100, -4, 4);\n",
"auto s1 = new TH1F(\"s1\", \"This is the first signal\", 100, -4, 4);\n",
"auto s2 = new TH1F(\"s2\", \"This is the second signal\", 100, -4, 4);\n",
"total->Sumw2(); // this makes sure that the sum of squares of weights will be stored\n",
"total->SetMarkerStyle(21);\n",
"total->SetMarkerSize(0.7);\n",
"main->SetFillColor(16);\n",
"s1->SetFillColor(42);\n",
"s2->SetFillColor(46);\n",
"TSlider *slider = 0;\n",
"gSystem->Unlink(\"hsumanim.gif\"); // delete old file"
]
},
{
"cell_type": "markdown",
"id": "eaac65ae",
"metadata": {},
"source": [
"Fill histograms randomly"
]
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"text": [
"i = 500\n",
"i = 1000\n",
"i = 1500\n",
"i = 2000\n",
"i = 2500\n",
"i = 3000\n",
"i = 3500\n",
"i = 4000\n",
"i = 4500\n",
"i = 5000\n",
"i = 5500\n",
"i = 6000\n",
"i = 6500\n",
"i = 7000\n",
"i = 7500\n",
"i = 8000\n",
"i = 8500\n",
"i = 9000\n",
"i = 9500\n"
]
}
],
"source": [
"gRandom->SetSeed();\n",
"const Int_t kUPDATE = 500;\n",
"Float_t xs1, xs2, xmain;\n",
"Int_t gifcnt = 0;\n",
"for (Int_t i = 0; i < 10000; i++) {\n",
" xmain = gRandom->Gaus(-1, 1.5);\n",
" xs1 = gRandom->Gaus(-0.5, 0.5);\n",
" xs2 = gRandom->Landau(1, 0.15);\n",
" main->Fill(xmain);\n",
" s1->Fill(xs1, 0.3);\n",
" s2->Fill(xs2, 0.2);\n",
" total->Fill(xmain);\n",
" total->Fill(xs1, 0.3);\n",
" total->Fill(xs2, 0.2);\n",
" if (i && (i % kUPDATE) == 0) {\n",
" if (i == kUPDATE) {\n",
" total->Draw(\"e1p\");\n",
" main->Draw(\"same\");\n",
" s1->Draw(\"same\");\n",
" s2->Draw(\"same\");\n",
" c1->Update();\n",
" slider = new TSlider(\"slider\", \"test\", 4.2, 0, 4.6, total->GetMaximum(), 38);\n",
" slider->SetFillColor(46);\n",
" }\n",
" if (slider)\n",
" slider->SetRange(0, Float_t(i) / 10000.);\n",
" c1->Modified();\n",
" c1->Update();\n",
" if (gROOT->IsBatch()) {\n",
" // c1->Print(\"hsumanim.gif+\");\n",
" printf(\"i = %d\\n\", i);\n",
" } else {\n",
" if (gSystem->ProcessEvents())\n",
" break;\n",
" }\n",
" }\n",
"}\n",
"slider->SetRange(0, 1);\n",
"total->Draw(\"sameaxis\"); // to redraw axis hidden by the fill area\n",
"c1->Modified();"
]
},
{
"cell_type": "markdown",
"id": "681f4bc2",
"metadata": {},
"source": [
"c1->Print(\"hsumanim.gif++\")"
]
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"execution_count": 4,
"id": "99601cbf",
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"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"hsum : Real Time = 0.68 seconds Cpu Time = 0.39 seconds\n"
]
}
],
"source": [
"gBenchmark->Show(\"hsum\");"
]
},
{
"cell_type": "markdown",
"id": "1d8a8363",
"metadata": {},
"source": [
"Draw all canvases "
]
},
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"source": [
"gROOT->GetListOfCanvases()->Draw()"
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}
],
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