{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "8dfcddbf",
   "metadata": {},
   "source": [
    "# hist001_TH1_fillrandom\n",
    "Fill a 1D histogram with random values using predefined functions.\n",
    "\n",
    "\n",
    "\n",
    "\n",
    "**Author:** Giacomo Parolini  \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 08:06 PM.</small></i>"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "fcf90937",
   "metadata": {},
   "source": [
    "Create a one dimensional histogram and fill it with a gaussian distribution"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "81e604df",
   "metadata": {
    "collapsed": false,
    "execution": {
     "iopub.execute_input": "2026-05-19T20:06:16.329840Z",
     "iopub.status.busy": "2026-05-19T20:06:16.329701Z",
     "iopub.status.idle": "2026-05-19T20:06:16.682692Z",
     "shell.execute_reply": "2026-05-19T20:06:16.674112Z"
    }
   },
   "outputs": [],
   "source": [
    "int nBins = 200;\n",
    "double rangeMin = 0.0;\n",
    "double rangeMax = 10.0;\n",
    "TH1D h1d(\"h1d\", \"Test random numbers\", nBins, rangeMin, rangeMax);"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "808cf00f",
   "metadata": {},
   "source": [
    "\"gaus\" is a predefined ROOT function. Here we are filling the histogram with\n",
    "10000 values sampled from that distribution."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "cfb35bb5",
   "metadata": {
    "collapsed": false,
    "execution": {
     "iopub.execute_input": "2026-05-19T20:06:16.709551Z",
     "iopub.status.busy": "2026-05-19T20:06:16.709398Z",
     "iopub.status.idle": "2026-05-19T20:06:17.073949Z",
     "shell.execute_reply": "2026-05-19T20:06:17.062621Z"
    }
   },
   "outputs": [],
   "source": [
    "h1d.FillRandom(\"gaus\", 10000);"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "5f9c34f2",
   "metadata": {},
   "source": [
    "Open a ROOT file and save the histogram"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "6bfa8c83",
   "metadata": {
    "collapsed": false,
    "execution": {
     "iopub.execute_input": "2026-05-19T20:06:17.095938Z",
     "iopub.status.busy": "2026-05-19T20:06:17.095767Z",
     "iopub.status.idle": "2026-05-19T20:06:17.318886Z",
     "shell.execute_reply": "2026-05-19T20:06:17.318104Z"
    }
   },
   "outputs": [],
   "source": [
    "auto myfile = std::unique_ptr<TFile>(TFile::Open(\"fillrandom.root\", \"RECREATE\"));\n",
    "myfile->WriteObject(&h1d, h1d.GetName());"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "da9e707d",
   "metadata": {},
   "source": [
    "Draw all canvases "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "5ff26a99",
   "metadata": {
    "collapsed": false,
    "execution": {
     "iopub.execute_input": "2026-05-19T20:06:17.335437Z",
     "iopub.status.busy": "2026-05-19T20:06:17.335284Z",
     "iopub.status.idle": "2026-05-19T20:06:17.559186Z",
     "shell.execute_reply": "2026-05-19T20:06:17.553564Z"
    }
   },
   "outputs": [],
   "source": [
    "gROOT->GetListOfCanvases()->Draw()"
   ]
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "ROOT C++",
   "language": "c++",
   "name": "root"
  },
  "language_info": {
   "codemirror_mode": "text/x-c++src",
   "file_extension": ".C",
   "mimetype": " text/x-c++src",
   "name": "c++"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 5
}