/[PAMELA software]/PamVMC_update/trk/src/f77/gpgaus.F
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Annotation of /PamVMC_update/trk/src/f77/gpgaus.F

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Revision 1.1 - (hide annotations) (download)
Tue Oct 15 15:51:25 2013 UTC (11 years, 2 months ago) by formato
Branch point for: MAIN, rel
Initial revision

1 formato 1.1 *
2     * $Id: gpgaus.F,v 1.5 2009-06-12 18:39:58 pam-rm2 Exp $
3     *
4     * $Log: gpgaus.F,v $
5     * Revision 1.5 2009-06-12 18:39:58 pam-rm2
6     * - Introduced user-defined names of output files and random seeds number.
7     * Users can do it use options of PamVMCApplication constructor:
8     * PamVMCApplication(const char* name, const char *title, const char*
9     * filename="pamtest", Int_t seed=0).
10     * The Random object that I use is TRandom3 object which has astronomical
11     * large period (in case of default initialization 0). All random generators
12     * in the code use this object by calling of gRandom singleton which keeps
13     * it.
14     *
15     * - Corrected TOF digitization routine. No problems with TDC hits due to
16     * hadronic interactions anymore.
17     *
18     * - Some small changes was done to compile code under Root 5.23. +
19     * geant4_vmc v. 2.6 without any warnings
20     *
21     * - Some classes of PamG4RunConfiguartion was changed for geant4_vmc v.
22     * 2.6.Some obsolete classes was deleted as soon as developers implemented
23     * regions.
24     *
25     * - Navigation was changed from "geomRootToGeant4" to "geomRoot", because on
26     * VMC web page written that as soon as Geant4 has no option ONLY/MANY
27     * translation of overlapped geometry to Geant4 through VGM could be wrong.
28     * I'd like to stay with Root navigation:
29     * http://root.cern.ch/root/vmc/Geant4VMC.html. This should be default
30     * option.
31     *
32     * - New Tracker digitization routine written by Sergio was implemented
33     *
34     * - PamVMC again became compatible with geant4_vmc v.2.5 and ROOT 5.20.
35     * The problem was that ROOT developers introduced in TVirtualMC class a new
36     * method SetMagField and new base class:TVirtualMagField from which
37     * user-defined classes shoukd be derived
38     *
39     * Revision 1.1 2009-02-19 17:46:25 nikolas
40     * Cleaning up before releasing
41     *
42     * Revision 3.1.1.1 2002/07/11 16:02:00 cafagna
43     * First GPAMELA release on CVS
44     *
45     *
46     *CMZ : 2.01/00 05/04/2000 14.35.18 by Marialuigia Ambriola
47     *CMZ : 2.00/00 03/03/2000 15.39.05 by Francesco Cafagna
48     *CMZ : 1.01/00 06/05/96 12.57.18 by Francesco Cafagna
49     *-- Author : Francesco Cafagna 03/05/96
50     REAL FUNCTION GPGAUS(XDUMMY)
51     ************************************************************************
52     * *
53     * To generate a normally distribute deviate with zero mean and unit variance *
54     * From GASDEV, Numerical recepies $7.3. *
55     * Variables definition: *
56     * IN: *
57     * XDUMMY, dummy argument *
58     * *
59     * Called by:<USER> *
60     * Author: Francesco Cafagna, 03/05/96 17.11.14 *
61     * *
62     ************************************************************************
63     INTEGER ISET
64     REAL V1,V2,GAS1,RVAL(2),R
65     *
66     DATA ISET/0/
67     *
68     * Generate a random number in the circle of radius 1
69     *
70     IF (ISET.EQ.0) THEN
71     c PRINT*,'GPGAUSS.F calls RNDM'
72     10 CALL GRNDMC(RVAL,2)
73     V1 = 2.*RVAL(1) -1.
74     V2 = 2.*RVAL(2) -1.
75     R = V1**2 + V2**2
76     IF(R.GE.1.) GO TO 10
77     GAS1 = V1 * SQRT(-2.*LOG(R)/R)
78     GPGAUS = V2 * SQRT(-2.*LOG(R)/R)
79     ISET = 1
80     ELSE
81     GPGAUS = GAS1
82     ISET = 0
83     ENDIF
84     *
85     RETURN
86     END

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