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1 --------------------------------------------------
2
3 =========================================================
4 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
5 =========================================================
6
7 AnaEx03
8 -------
9
10 Example AnaEx03 demonstrates usage of analysis commands for file management
11 (new since Geant4 11.1), in particular writing histograms and ntuples in a file
12 multiple times, and commands for histogram deleting (new since Geant4 11.2).
13
14 It uses the same scenario (detector description, primary generator
15 and physics) as AnaEx02 and AnaEx02. In difference from these examples
16 the analysis manipulations (histograms and ntuples booking and filling)
17 are performed directly with G4AnalysisManager. The classes that are same
18 in all three examples are located in shared directory.
19
20 For detector description, primary generator, physics and the example output
21 see README in AnaEx01 example.
22
23 Histograms, Ntuple:
24 --------------------
25
26 The example produces the same 4 histograms and 2 ntuples as in AnaEx01.
27
28 These histos and ntuples are booked in the RunAction constructor and filled from
29 EventAction.
30
31 The file managent in this example, usually performed via calls to G4AnalysisManager
32 OpenFile(), Write() and CloseFile() in the code, is in this example performed
33 via UI commands in a macro:
34 /analysis/openFile
35 /analysis/write
36 /analysis/closeFile
37
38 Note that the file need not to be closed at each end of run, but the histograms and ntuples
39 can be saved in the same file multiple time. In that case we need to reset the histograms
40 and ntuples data before a new run:
41 /analysis/reset
42
43 We can define the default file type and set it to the analysis manager via
44 /analysis/setDefaultFileType root # or csv hdf5 xml
45
46 The file names then need not to be provided with the file extension and the same macro
47 can be used with different output types.
48
49 To demonstrate UI commands for deleting of selected histograms:
50 /analysis/h1/delete id [keepSetting]
51 two H1 histograms, id: 1 and 3, are deleted in AnaEx03.in macro before starting Run 2,
52 and new histograms are then created before starting Run3. New histograms are created at
53 id's liberated with previous deleting, 1 and 3.
54
55 It should be notes that using UI commands for writing histograms and ntuples in a file
56 multiple times is not necessary, the same can be achieved by calls to G4AnalysisManager
57 functions from the code using conditional statements.
58
59 Macros:
60 --------
61
62 The AnaEx03.in macro performs 5 runs and produces 2 files: e-.root, containg data from first
63 3 runs, and proton.root, containing data from the next 2 runs.
64 The macro uses the defaultFileType parameter (alias), which default value, "root" is
65 defined in main.
66
67 AnaEx03-csv.in, AnaEx03-hdf5.in, AnaEx03-root.in, AnaEx03-xml.in:
68
69 In these macros, the default value of the defaultFileType is overritten with
70
71 /control/alias defaultFileType cvs # or hdf5 root xml
72
73 and then the AnaEx03.in macro is called.
74
75 The plotter.mac macro can be used in the interactive mode to plot histograms. It should be executed after the first /run/beamOn call and before the first /analysis/reset call.
76 (See also a commented line with this macro call in AnaEx03.in.)
77
78 How to run
79 --------------
80
81 - It is preferable to execute the exampole in the 'batch' mode from macro files:
82 % ./AnaEx03 AnaEx03.in
83 % ./AnaEx03 AnaEx03.in >& output
84
85 - When executing AnaEx03 in the 'interactive mode' with visualization, be careful not
86 to forget to issue the /analysis/openFile command befor starting a run:
87
88 % ./AnaEx03
89 and type in the commands from AnaEx03[-xyz].mac line by line:
90 Idle> /analysis/openFile myFile
91 Idle> /tracking/verbose 1
92 Idle> /run/beamOn 10
93 Idle> ...
94 Idle> /analysis/write
95 Idle> /analysis/closeFile
96 ....
97 Idle> exit
98
99 All AnaEx03-*.in macros are used in Geant4 testing.
