{
"cells": [
{
"cell_type": "markdown",
"id": "7eba22e3",
"metadata": {},
"source": [
"# df000_simple\n",
"Simple RDataFrame example in Python.\n",
"\n",
"This tutorial shows a minimal example of RDataFrame. It starts without input\n",
"data, generates a new column `x` with random numbers, and finally draws\n",
"a histogram for `x`.\n",
"\n",
"\n",
"\n",
"\n",
"**Author:** Enric Tejedor (CERN) \n",
"This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Tuesday, May 19, 2026 at 08:09 PM."
]
},
{
"cell_type": "code",
"execution_count": 1,
"id": "d7e756e9",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:09:17.794927Z",
"iopub.status.busy": "2026-05-19T20:09:17.794804Z",
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"shell.execute_reply": "2026-05-19T20:09:18.780543Z"
}
},
"outputs": [],
"source": [
"import ROOT"
]
},
{
"cell_type": "markdown",
"id": "a5183799",
"metadata": {},
"source": [
"Create a data frame with 100 rows"
]
},
{
"cell_type": "code",
"execution_count": 2,
"id": "d5c69fb3",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:09:18.790221Z",
"iopub.status.busy": "2026-05-19T20:09:18.790086Z",
"iopub.status.idle": "2026-05-19T20:09:19.270005Z",
"shell.execute_reply": "2026-05-19T20:09:19.269481Z"
}
},
"outputs": [],
"source": [
"rdf = ROOT.RDataFrame(100)"
]
},
{
"cell_type": "markdown",
"id": "0202de44",
"metadata": {},
"source": [
"Define a new column `x` that contains random numbers"
]
},
{
"cell_type": "code",
"execution_count": 3,
"id": "abaa723d",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:09:19.272102Z",
"iopub.status.busy": "2026-05-19T20:09:19.271980Z",
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"shell.execute_reply": "2026-05-19T20:09:19.415718Z"
}
},
"outputs": [],
"source": [
"rdf_x = rdf.Define(\"x\", \"gRandom->Rndm()\")"
]
},
{
"cell_type": "markdown",
"id": "123aecf7",
"metadata": {},
"source": [
"Create a histogram from `x` and draw it"
]
},
{
"cell_type": "code",
"execution_count": 4,
"id": "dea1f5e7",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:09:19.426638Z",
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"shell.execute_reply": "2026-05-19T20:09:20.742704Z"
}
},
"outputs": [
{
"name": "stderr",
"output_type": "stream",
"text": [
"Info in : created default TCanvas with name c1\n"
]
}
],
"source": [
"h = rdf_x.Histo1D(\"x\")\n",
"h.Draw()"
]
},
{
"cell_type": "markdown",
"id": "80bc4ed3",
"metadata": {},
"source": [
"Draw all canvases "
]
},
{
"cell_type": "code",
"execution_count": 5,
"id": "591100f0",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:09:20.744484Z",
"iopub.status.busy": "2026-05-19T20:09:20.744357Z",
"iopub.status.idle": "2026-05-19T20:09:20.934349Z",
"shell.execute_reply": "2026-05-19T20:09:20.933486Z"
}
},
"outputs": [
{
"data": {
"text/html": [
"\n",
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"\n",
"\n"
],
"text/plain": [
""
]
},
"metadata": {},
"output_type": "display_data"
}
],
"source": [
"from ROOT import gROOT \n",
"gROOT.GetListOfCanvases().Draw()"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3",
"language": "python",
"name": "python3"
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