{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Building a Graph from an ASCII File\n",
"
\n",
"In this example we will read the points from a file and produce a simple graph."
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Create the canvas on which we'll draw the graph."
]
},
{
"cell_type": "code",
"execution_count": 1,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"TCanvas c;\n",
"c.SetGrid();"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Create the graph of expected points by reading from an ASCII file."
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stderr",
"output_type": "stream",
"text": [
" % Total % Received % Xferd Average Speed Time Time Time Current\n",
" Dload Upload Total Spent Left Speed\n",
"100 221 100 221 0 0 774 0 --:--:-- --:--:-- --:--:-- 775\n"
]
}
],
"source": [
".! curl https://raw.githubusercontent.com/root-mirror/training/master/2016/macro2_input_expected.txt -o macro2_input_expected.txt"
]
},
{
"cell_type": "code",
"execution_count": 3,
"metadata": {
"collapsed": false
},
"outputs": [],
"source": [
"TGraphErrors graph_expected(\"./macro2_input_expected.txt\", \"%lg %lg %lg\");\n",
"\n",
"graph_expected.SetTitle(\n",
" \"Measurement XYZ and Expectation;\"\n",
" \"lenght [cm];\"\n",
" \"Arb.Units\");\n",
"graph_expected.SetFillColor(kYellow);\n",
"graph_expected.Draw(\"E3AL\"); // E3 draws the band"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Create the graph of measured points, also reading from a file."
]
},
{
"cell_type": "code",
"execution_count": 4,
"metadata": {
"collapsed": false
},
"outputs": [],
"source": [
"TGraphErrors graph(\"../macro2_input.txt\", \"%lg %lg %lg\");\n",
"\n",
"graph.SetMarkerStyle(kCircle);\n",
"graph.SetFillColor(0);\n",
"graph.Draw(\"PESame\");"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Draw the legend."
]
},
{
"cell_type": "code",
"execution_count": 5,
"metadata": {
"collapsed": false
},
"outputs": [],
"source": [
"TLegend leg(.1, .7, .3, .9, \"Lab. Lesson 2\");\n",
"leg.SetFillColor(0);\n",
"leg.AddEntry(&graph_expected, \"Expected Points\");\n",
"leg.AddEntry(&graph, \"Measured Points\");\n",
"leg.Draw(\"Same\");"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Display in the notebook what is in our canvas as interactive javascript graphics."
]
},
{
"cell_type": "code",
"execution_count": 6,
"metadata": {
"collapsed": false
},
"outputs": [
{
"data": {
"text/html": [
"\n",
"\n",
"
\n",
"\n",
"\n"
],
"text/plain": [
""
]
},
"metadata": {},
"output_type": "display_data"
}
],
"source": [
"%jsroot on\n",
"c.Draw();"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Print graph and error values."
]
},
{
"cell_type": "code",
"execution_count": 7,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"x[0]=1, y[0]=6, ex[0]=0, ey[0]=5\n",
"x[1]=2, y[1]=12, ex[1]=0, ey[1]=5\n",
"x[2]=3, y[2]=14, ex[2]=0, ey[2]=4.7\n",
"x[3]=4, y[3]=20, ex[3]=0, ey[3]=4.5\n",
"x[4]=5, y[4]=22, ex[4]=0, ey[4]=4.2\n",
"x[5]=6, y[5]=24, ex[5]=0, ey[5]=5.1\n",
"x[6]=7, y[6]=35, ex[6]=0, ey[6]=2.9\n",
"x[7]=8, y[7]=45, ex[7]=0, ey[7]=4.1\n",
"x[8]=9, y[8]=44, ex[8]=0, ey[8]=4.8\n",
"x[9]=10, y[9]=53, ex[9]=0, ey[9]=5.43\n"
]
}
],
"source": [
"graph.Print();"
]
}
],
"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": 0
}