{
"cells": [
{
"cell_type": "markdown",
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"source": [
"# hist018_TH2_cutg\n",
"use TCutG object to select bins for drawing.\n",
"Moving TCutG object one can change displayed region of histogram\n",
"\n",
"\n",
"\n",
"\n",
"**Author:** Sergey Linev \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."
]
},
{
"cell_type": "code",
"execution_count": 1,
"id": "40617a5a",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:12:20.266288Z",
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"shell.execute_reply": "2026-05-19T20:12:20.607471Z"
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},
"outputs": [],
"source": [
"const int n = 6;\n",
"Float_t x[6] = {1, 2, 1, -1, -2, -1};\n",
"Float_t y[6] = {2, 0, -2, -2, 0, 2};\n",
"TCutG *cut = new TCutG(\"cut\", 6, x, y);\n",
"TH2F *hist = new TH2F(\"hist\", \"Histogram with cut\", 40, -10., 10., 40, -10., 10.);\n",
"for (int i = 0; i < 100000; i++)\n",
" hist->Fill(gRandom->Gaus(0., 3.), gRandom->Gaus(0., 3.));\n",
"TCanvas *c1 = new TCanvas(\"c1\", \"Histogram draw with TCutG\", 600, 900);\n",
"hist->Draw(\"col [cut]\");\n",
"cut->Draw(\"l\");"
]
},
{
"cell_type": "markdown",
"id": "2317a7e6",
"metadata": {},
"source": [
"Draw all canvases "
]
},
{
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"execution_count": 2,
"id": "cbac1986",
"metadata": {
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"output_type": "display_data"
}
],
"source": [
"%jsroot on\n",
"gROOT->GetListOfCanvases()->Draw()"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "ROOT C++",
"language": "c++",
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