{
"cells": [
{
"cell_type": "markdown",
"id": "6d8bf173",
"metadata": {},
"source": [
"# gr108_timeSeriesFromCSV\n",
"with data read from a text file containing the SWAN usage\n",
"statistics during July 2017.\n",
"\n",
"\n",
"\n",
"**Author:** Danilo Piparo, Olivier Couet \n",
"This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Tuesday, May 19, 2026 at 08:38 PM."
]
},
{
"cell_type": "markdown",
"id": "39c3fc7d",
"metadata": {},
"source": [
"Open the data file. This csv contains the usage statistics of a CERN IT\n",
"service, SWAN, during two weeks. We would like to plot this data with\n",
"ROOT to draw some conclusions from it."
]
},
{
"cell_type": "code",
"execution_count": 1,
"id": "616193e3",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:38:21.313669Z",
"iopub.status.busy": "2026-05-19T20:38:21.313541Z",
"iopub.status.idle": "2026-05-19T20:38:21.634218Z",
"shell.execute_reply": "2026-05-19T20:38:21.633450Z"
}
},
"outputs": [],
"source": [
"TString dir = gROOT->GetTutorialDir();\n",
"dir.Append(\"/visualisation/graphs/\");\n",
"dir.ReplaceAll(\"/./\", \"/\");\n",
"FILE *f = fopen(Form(\"%sSWAN2017.dat\", dir.Data()), \"r\");"
]
},
{
"cell_type": "markdown",
"id": "ae688ad9",
"metadata": {},
"source": [
"Create the time graph. In this example, we don't specify anything about it,\n",
"and data points will be added with SetPoint (the first point has index 0)"
]
},
{
"cell_type": "code",
"execution_count": 2,
"id": "94e63894",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:38:21.636242Z",
"iopub.status.busy": "2026-05-19T20:38:21.636028Z",
"iopub.status.idle": "2026-05-19T20:38:21.843697Z",
"shell.execute_reply": "2026-05-19T20:38:21.843010Z"
}
},
"outputs": [],
"source": [
"auto g = new TGraph();\n",
"g->SetTitle(\"SWAN Users during July 2017;Time;Number of Sessions\");"
]
},
{
"cell_type": "markdown",
"id": "f3f137f6",
"metadata": {},
"source": [
"Read the data and fill the graph with time along the X axis and number\n",
"of users along the Y axis"
]
},
{
"cell_type": "code",
"execution_count": 3,
"id": "db55cae6",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:38:21.845794Z",
"iopub.status.busy": "2026-05-19T20:38:21.845667Z",
"iopub.status.idle": "2026-05-19T20:38:22.057529Z",
"shell.execute_reply": "2026-05-19T20:38:22.056846Z"
}
},
"outputs": [],
"source": [
"char line[80];\n",
"float v;\n",
"char dt[20];\n",
"int i = 0;\n",
"while (fgets(line, 80, f)) {\n",
" sscanf(&line[20], \"%f\", &v);\n",
" strncpy(dt, line, 18);\n",
" dt[19] = '\\0';\n",
" g->SetPoint(i, TDatime(dt).Convert(), v);\n",
" i++;\n",
"}\n",
"fclose(f);"
]
},
{
"cell_type": "markdown",
"id": "c61516d3",
"metadata": {},
"source": [
"Draw the graph"
]
},
{
"cell_type": "code",
"execution_count": 4,
"id": "e4162ef6",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:38:22.059730Z",
"iopub.status.busy": "2026-05-19T20:38:22.059595Z",
"iopub.status.idle": "2026-05-19T20:38:22.272426Z",
"shell.execute_reply": "2026-05-19T20:38:22.271800Z"
}
},
"outputs": [],
"source": [
"auto c = new TCanvas(\"c\", \"c\", 950, 500);\n",
"c->SetLeftMargin(0.07);\n",
"c->SetRightMargin(0.04);\n",
"c->SetGrid();\n",
"g->SetLineWidth(3);\n",
"g->SetLineColor(kBlue);\n",
"g->Draw(\"al\");\n",
"g->GetYaxis()->CenterTitle();"
]
},
{
"cell_type": "markdown",
"id": "8ffb4270",
"metadata": {},
"source": [
"Make the X axis labelled with time"
]
},
{
"cell_type": "code",
"execution_count": 5,
"id": "29371597",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:38:22.274175Z",
"iopub.status.busy": "2026-05-19T20:38:22.274060Z",
"iopub.status.idle": "2026-05-19T20:38:22.485910Z",
"shell.execute_reply": "2026-05-19T20:38:22.485314Z"
}
},
"outputs": [],
"source": [
"auto xaxis = g->GetXaxis();\n",
"xaxis->SetTimeDisplay(1);\n",
"xaxis->CenterTitle();\n",
"xaxis->SetTimeFormat(\"%a %d\");\n",
"xaxis->SetTimeOffset(0);\n",
"xaxis->SetNdivisions(-219);\n",
"xaxis->SetLimits(TDatime(2017, 7, 3, 0, 0, 0).Convert(), TDatime(2017, 7, 22, 0, 0, 0).Convert());\n",
"xaxis->SetLabelSize(0.025);\n",
"xaxis->CenterLabels();"
]
},
{
"cell_type": "markdown",
"id": "e3e12c78",
"metadata": {},
"source": [
"Draw all canvases "
]
},
{
"cell_type": "code",
"execution_count": 6,
"id": "efa4c1c8",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:38:22.487677Z",
"iopub.status.busy": "2026-05-19T20:38:22.487546Z",
"iopub.status.idle": "2026-05-19T20:38:22.723982Z",
"shell.execute_reply": "2026-05-19T20:38:22.723324Z"
}
},
"outputs": [
{
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}
],
"source": [
"%jsroot on\n",
"gROOT->GetListOfCanvases()->Draw()"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "ROOT C++",
"language": "c++",
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