{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "291fe7af",
   "metadata": {},
   "source": [
    "# tree120_ntuple\n",
    "Simple tree analysis.\n",
    "\n",
    "\n",
    "\n",
    "\n",
    "**Author:** Rene Brun  \n",
    "<i><small>This notebook tutorial was automatically generated with <a href= \"https://github.com/root-project/root/blob/master/documentation/doxygen/converttonotebook.py\">ROOTBOOK-izer</a> from the macro found in the ROOT repository  on Tuesday, May 19, 2026 at 08:18 PM.</small></i>"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "6356822e",
   "metadata": {},
   "source": [
    "just in case this script is executed multiple times"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "e13bbb17",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "delete gROOT->GetListOfFiles()->FindObject(\"hsimple.root\");\n",
    "delete gROOT->GetListOfCanvases()->FindObject(\"c1\");\n",
    "\n",
    "gBenchmark->Start(\"ntuple1\");"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "ed24a615",
   "metadata": {},
   "source": [
    "Connect ROOT histogram/ntuple demonstration file\n",
    "generated by example $ROOTSYS/tutorials/hsimple.C."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "14c9a1b5",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "TString dir = gROOT->GetTutorialDir();\n",
    "dir.Append(\"/hsimple.C\");\n",
    "dir.ReplaceAll(\"/./\",\"/\");\n",
    "if (gBenchmark->GetBench(\"hsimple\") < 0)\n",
    "   gInterpreter->LoadMacro(dir.Data());\n",
    "TFile *f1 = (TFile*)gROOT->ProcessLineFast(\"hsimple(1)\");\n",
    "if (!f1)\n",
    "   return;"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "e13247f8",
   "metadata": {},
   "source": [
    "Create a canvas, with 4 pads"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "bf52a989",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "auto c1 = new TCanvas(\"c1\",\"The Ntuple canvas\",200,10,700,780);\n",
    "auto pad1 = new TPad(\"pad1\",\"This is pad1\",0.02,0.52,0.48,0.98,21);\n",
    "auto pad2 = new TPad(\"pad2\",\"This is pad2\",0.52,0.52,0.98,0.98,21);\n",
    "auto pad3 = new TPad(\"pad3\",\"This is pad3\",0.02,0.02,0.48,0.48,21);\n",
    "auto pad4 = new TPad(\"pad4\",\"This is pad4\",0.52,0.02,0.98,0.48,1);\n",
    "pad1->Draw();\n",
    "pad2->Draw();\n",
    "pad3->Draw();\n",
    "pad4->Draw();"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "e8e24d27",
   "metadata": {},
   "source": [
    "Change default style for the statistics box"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "0d565ad6",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "gStyle->SetStatW(0.30);\n",
    "gStyle->SetStatH(0.20);"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "e0acf7d1",
   "metadata": {},
   "source": [
    "Display a function of one ntuple column imposing a condition\n",
    "on another column."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "c823c096",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "pad1->cd();\n",
    "pad1->SetGrid();\n",
    "pad1->SetLogy();\n",
    "auto ntuple = f1->Get<TNtuple>(\"ntuple\");\n",
    "ntuple->SetLineColor(1);\n",
    "ntuple->SetFillStyle(1001);\n",
    "ntuple->SetFillColor(45);\n",
    "ntuple->Draw(\"3*px+2\",\"px**2+py**2>1\");\n",
    "ntuple->SetFillColor(38);\n",
    "ntuple->Draw(\"2*px+2\",\"pz>2\",\"same\");\n",
    "ntuple->SetFillColor(5);\n",
    "ntuple->Draw(\"1.3*px+2\",\"(px^2+py^2>4) && py>0\",\"same\");\n",
    "pad1->RedrawAxis();"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "7b33376e",
   "metadata": {},
   "source": [
    "Display the profile of two columns\n",
    "The profile histogram produced is saved in the current directory with\n",
    "the name hprofs"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "2d3f612e",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "pad2->cd();\n",
    "pad2->SetGrid();\n",
    "ntuple->Draw(\"pz:px>>hprofs\",\"\",\"goffprofs\");\n",
    "TProfile *hprofs = (TProfile*)gDirectory->Get(\"hprofs\");\n",
    "hprofs->SetMarkerColor(5);\n",
    "hprofs->SetMarkerSize(0.7);\n",
    "hprofs->SetMarkerStyle(21);\n",
    "hprofs->Fit(\"pol2\");"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "0ae34000",
   "metadata": {},
   "source": [
    "Get pointer to fitted function and modify its attributes"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "eed92f0f",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "TF1 *fpol2 = hprofs->GetFunction(\"pol2\");\n",
    "fpol2->SetLineWidth(4);\n",
    "fpol2->SetLineColor(2);"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "a340bf5f",
   "metadata": {},
   "source": [
    "Display a scatter plot of two columns with a selection.\n",
    "Superimpose the result of another cut with a different marker color"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "0663c630",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "pad3->cd();\n",
    "pad3->GetFrame()->SetBorderSize(8);\n",
    "ntuple->SetMarkerColor(1);\n",
    "ntuple->Draw(\"py:px\",\"pz>1\");\n",
    "ntuple->SetMarkerColor(2);\n",
    "ntuple->Draw(\"py:px\",\"pz<1\",\"same\");"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "0b7cac5f",
   "metadata": {},
   "source": [
    "Display a 3-D scatter plot of 3 columns. Superimpose a different selection."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "f5ee7fcb",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "pad4->cd();\n",
    "ntuple->Draw(\"pz:py:px\",\"(pz<10 && pz>6)+(pz<4 && pz>3)\");\n",
    "ntuple->SetMarkerColor(4);\n",
    "ntuple->Draw(\"pz:py:px\",\"pz<6 && pz>4\",\"same\");\n",
    "ntuple->SetMarkerColor(5);\n",
    "ntuple->Draw(\"pz:py:px\",\"pz<4 && pz>3\",\"same\");\n",
    "auto l4 = new TPaveText(-0.9,0.5,0.9,0.95);\n",
    "l4->SetFillColor(42);\n",
    "l4->SetTextAlign(12);\n",
    "l4->AddText(\"You can interactively rotate this view in 2 ways:\");\n",
    "l4->AddText(\"  - With the RotateCube in clicking in this pad\");\n",
    "l4->AddText(\"  - Selecting View with x3d in the View menu\");\n",
    "l4->Draw();"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "5ed442dc",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "c1->cd();\n",
    "c1->Update();\n",
    "gStyle->SetStatColor(19);\n",
    "gBenchmark->Show(\"ntuple1\");"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "b42400c2",
   "metadata": {},
   "source": [
    "Draw all canvases "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "d9aa9686",
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "gROOT->GetListOfCanvases()->Draw()"
   ]
  }
 ],
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  "kernelspec": {
   "display_name": "ROOT C++",
   "language": "c++",
   "name": "root"
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   "codemirror_mode": "text/x-c++src",
   "file_extension": ".C",
   "mimetype": " text/x-c++src",
   "name": "c++"
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