{
"cells": [
{
"cell_type": "markdown",
"id": "95b72c64",
"metadata": {},
"source": [
"# formula1\n",
"TF1 example.\n",
"\n",
"\n",
"\n",
"\n",
"**Author:** Wim Lavrijsen \n",
"This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Tuesday, May 19, 2026 at 08:37 PM."
]
},
{
"cell_type": "code",
"execution_count": 1,
"id": "8d09b593",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:37:04.452955Z",
"iopub.status.busy": "2026-05-19T20:37:04.452838Z",
"iopub.status.idle": "2026-05-19T20:37:05.614526Z",
"shell.execute_reply": "2026-05-19T20:37:05.613508Z"
}
},
"outputs": [],
"source": [
"from ROOT import TCanvas, TFormula, TF1\n",
"from ROOT import gROOT, gObjectTable\n",
"\n",
"c1 = TCanvas( 'c1', 'Example with Formula', 200, 10, 700, 500 )"
]
},
{
"cell_type": "markdown",
"id": "3dc827c1",
"metadata": {},
"source": [
"We create a formula object and compute the value of this formula\n",
"for two different values of the x variable."
]
},
{
"cell_type": "code",
"execution_count": 2,
"id": "932fca00",
"metadata": {
"collapsed": false,
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"shell.execute_reply": "2026-05-19T20:37:05.740282Z"
}
},
"outputs": [
{
"data": {
"text/plain": [
"6.708203932499369"
]
},
"execution_count": 2,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"form1 = TFormula( 'form1', 'sqrt(abs(x))' )\n",
"form1.Eval( 2 )\n",
"form1.Eval( -45 )"
]
},
{
"cell_type": "markdown",
"id": "78e202b8",
"metadata": {},
"source": [
"Create a one dimensional function and draw it"
]
},
{
"cell_type": "code",
"execution_count": 3,
"id": "58332919",
"metadata": {
"collapsed": false,
"execution": {
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"shell.execute_reply": "2026-05-19T20:37:05.993390Z"
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"outputs": [
{
"data": {
"text/html": [
"\n",
"\n",
"\n",
"
\n",
"\n",
"\n",
"\n"
],
"text/plain": [
""
]
},
"metadata": {},
"output_type": "display_data"
}
],
"source": [
"fun1 = TF1( 'fun1', 'abs(sin(x)/x)', 0, 10 )\n",
"c1.SetGridx()\n",
"c1.SetGridy()\n",
"fun1.Draw()\n",
"c1.Update()"
]
},
{
"cell_type": "markdown",
"id": "5dd30697",
"metadata": {},
"source": [
"Before leaving this demo, we print the list of objects known to ROOT"
]
},
{
"cell_type": "code",
"execution_count": 4,
"id": "1787477f",
"metadata": {
"collapsed": false,
"execution": {
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"shell.execute_reply": "2026-05-19T20:37:06.107639Z"
}
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"\n",
"Object statistics\n",
"class cnt on heap size total size heap size\n",
"================================================================================\n",
"TList 129 129 104 13416 13416\n",
"TObjectTable 1 1 32 32 32\n",
"TROOT 1 0 712 712 0\n",
"TPluginManager 1 1 40 40 40\n",
"THashTable 2 2 72 144 144\n",
"TClassTable 1 1 16 16 16\n",
"THashList 1 1 112 112 112\n",
"TEnv 1 1 56 56 56\n",
"TEnvRec 142 142 96 13632 13632\n",
"TUnixSystem 1 1 672 672 672\n",
"TOrdCollection 4 4 72 288 288\n",
"--------------------------------------------------------------------------------\n",
"Total: 284 283 1984 29120 28408\n",
"================================================================================\n",
"\n"
]
}
],
"source": [
"if ( gObjectTable ):\n",
" gObjectTable.Print()"
]
},
{
"cell_type": "markdown",
"id": "f8eb2702",
"metadata": {},
"source": [
"Draw all canvases "
]
},
{
"cell_type": "code",
"execution_count": 5,
"id": "1383eef6",
"metadata": {
"collapsed": false,
"execution": {
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"iopub.status.idle": "2026-05-19T20:37:06.221013Z",
"shell.execute_reply": "2026-05-19T20:37:06.220268Z"
}
},
"outputs": [
{
"data": {
"text/html": [
"\n",
"\n",
"\n",
"
\n",
"\n",
"\n",
"\n"
],
"text/plain": [
""
]
},
"metadata": {},
"output_type": "display_data"
}
],
"source": [
"%jsroot on\n",
"from ROOT import gROOT \n",
"gROOT.GetListOfCanvases().Draw()"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3",
"language": "python",
"name": "python3"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 3
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.12.12"
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"nbformat": 4,
"nbformat_minor": 5
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