KADD 2022 Laboratorium 1 EN

From Łukasz Graczykowski

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	* draw the graph in a separate window		* draw the graph in a separate window
-	== Uwagi ==	+	== Attention ==
-	* <b>Uwaga!</b> Aby środowisko ROOT można było uruchomić na własnym koncie użytkownika w laboratorium, należy w pliku <code>$HOME/.bashrc</code> dopisać następujące linijki (jeśli nie były dodane na zajęciach z PTI):	+	* <b>Attention!</b> In order to run ROOT environment on your student account in the laboratory, you have to add the following lines (if they were not added already) to the file <code>$HOME/.bashrc</code> (they could had been added during the PTI class):
	export ROOTSYS=/opt/root		export ROOTSYS=/opt/root
	export PATH=$PATH:$ROOTSYS/bin		export PATH=$PATH:$ROOTSYS/bin
	export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$ROOTSYS/lib		export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$ROOTSYS/lib
-	* środowisko ROOT jest zainstalowane lokalnie na każdym komputerze - nie jest dostępne na serwerze	+	* the ROOT environment is installed separately on each computer - it is not available on the server
-	* w środowisku ROOT piszemy <b>makra</b>, które mają rozszerzenie .c, .C, .cpp, lub .cxx	+	* in the ROOT environment  we write <b>macros</b>, which have extensions .c, .C, .cpp, or .cxx
-	* makro zawiera w sobie kod w języku C++ interpretowany linijka po linijce	+	* a macro contains a C++ code interpreted line-by-line
-	* w zasadzie nie musimy załączać żadnych bibliotek	+	* in principle, we do not need to include any libraries
-	* przykład 1:	+	* example 1:
	{		{
	double x = 5;		double x = 5;
	cout<<x<<endl;		cout<<x<<endl;
	}		}
-	* wywołanie makra: uruchamiamy środowisko (komenda <code>root</code>), wpisujemy <code>.x macro.C</code>	+	* execution of a macro: start the environment (command <code>root</code>), type <code>.x macro.C</code>
-	* makro może zawierać również <b>funkcje</b>, przykład 2:	+	* macro can also contain  <b>funkcje</b>, example 2:
	int macro()		int macro()
	{		{
Line 65:		Line 65:
	return 1;		return 1;
	}		}
-	* nazwa makra musi być taka sama jak nazwa funkcji w makrze (by można było je uruchomić komendą <code>.x macro.C</code>)	+	* name of the macro must be the same as the name of the main  function in the macro (in order to run it with the command <code>.x macro.C</code>)
-	* w makrach może być więcej funkcji - przy standardowym uruchomieniu wywołana zawsze będzie ta funkcja, której nazwa zgadza się z nazwą makra (odpowiednik funkcji <code>main</code> w standardowym C++)	+	* macros can contain more functions - during the macro execution the one which will be run is that which name corresponds to the macro name (the equivalent of the  <code>main</code> function in standard C++)
-	== Wynik ==	+	== Results ==
-	Wykresy:	+	Plots:
-	* okno 1	+	* window 1
	[[File:lab1_1.png]]		[[File:lab1_1.png]]
-	* okno 2	+	* window 2
	[[File:1_2.png]]		[[File:1_2.png]]

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Latest revision as of 12:47, 28 February 2022

Contents 1 Documentation 2 Exercise 3 Attention 4 Results

Documentation

Documentation of the ROOT environment:

• main page: https://root.cern.ch/
• documentation of the development version (master): https://root.cern.ch/doc/master/
• documentation of the stable version (6.22): https://root.cern/doc/v622/
• documentation of the laboratory version (5.32.00): https://root.cern.ch/root/html532/ last version with the old C++ interpreter

Exercise

1. Write a macro, which:

• creates an object fun1 of type TF1 representing a sin(x) function (see class TMath)
• creates an object fun2 of type TF1 representing a cos(x) function
• creates a window with 4 panels (panel distribution 2x2) - see class TCanvas and method Divide
• draws the fun1 object on panel 1, fun2 on panel 2, and two functions simultaneously on panel 3
• changes the color of the line of function fun2 to blue - see method SetLineColor and class TColor

2. Let's imagine we throw a dice that is asymmetric. The table below summarizes the results:

Number of pips	1	2	3	4	5	6
Number of throws	2	1	5	4	10	12

We modify further the macro:

• let's create a histogram (see class TH1D) by filling each bin (which corresponds to each dice facet) with values from the table (number of throws) - the histogram should be plotted on panel 4
• create a plot, called graph (see class TGraph) according to values from the table.
• change the style of graph points (see method SetMarkerStyle and class TAttMarker)
• draw the graph in a separate window

Attention

• Attention! In order to run ROOT environment on your student account in the laboratory, you have to add the following lines (if they were not added already) to the file $HOME/.bashrc (they could had been added during the PTI class):

 export ROOTSYS=/opt/root
 export PATH=$PATH:$ROOTSYS/bin
 export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$ROOTSYS/lib 

• the ROOT environment is installed separately on each computer - it is not available on the server
• in the ROOT environment we write macros, which have extensions .c, .C, .cpp, or .cxx
• a macro contains a C++ code interpreted line-by-line
• in principle, we do not need to include any libraries
• example 1:

{
    double x = 5;
    cout<<x<<endl;
}

• execution of a macro: start the environment (command root), type .x macro.C
• macro can also contain funkcje, example 2:

int macro()
{
    double x = 5;
    cout<<x<<endl;
    return 1;
}

• name of the macro must be the same as the name of the main function in the macro (in order to run it with the command .x macro.C)
• macros can contain more functions - during the macro execution the one which will be run is that which name corresponds to the macro name (the equivalent of the main function in standard C++)

Results

Plots:

• window 1

• window 2