1 | !*********************************************************************** |
---|
2 | !* Copyright 2012,2013 * |
---|
3 | !* Jerome Brioude, Delia Arnold, Andreas Stohl, Wayne Angevine, * |
---|
4 | !* John Burkhart, Massimo Cassiani, Adam Dingwell, Richard C Easter, Sabine Eckhardt,* |
---|
5 | !* Stephanie Evan, Jerome D Fast, Don Morton, Ignacio Pisso, * |
---|
6 | !* Petra Seibert, Gerard Wotawa, Caroline Forster, Harald Sodemann, * |
---|
7 | !* This file is part of FLEXPART WRF * |
---|
8 | !* * |
---|
9 | !* FLEXPART is free software: you can redistribute it and/or modify * |
---|
10 | !* it under the terms of the GNU General Public License as published by* |
---|
11 | !* the Free Software Foundation, either version 3 of the License, or * |
---|
12 | !* (at your option) any later version. * |
---|
13 | !* * |
---|
14 | !* FLEXPART is distributed in the hope that it will be useful, * |
---|
15 | !* but WITHOUT ANY WARRANTY; without even the implied warranty of * |
---|
16 | !* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
---|
17 | !* GNU General Public License for more details. * |
---|
18 | !* * |
---|
19 | !* You should have received a copy of the GNU General Public License * |
---|
20 | !* along with FLEXPART. If not, see <http://www.gnu.org/licenses/>. * |
---|
21 | !*********************************************************************** |
---|
22 | !C--- adapted from press et al. 1992 numerial recipes in Fortran by Massimo Cassiani to jse RANLUX as uniform random number generator |
---|
23 | FUNCTION gasdevlux() |
---|
24 | USE luxury |
---|
25 | INTEGER idum |
---|
26 | REAL gasdevlux |
---|
27 | INTEGER iset |
---|
28 | REAL fac,gset,rsq,v1,v2,RTEST(2) |
---|
29 | SAVE iset,gset |
---|
30 | DATA iset/0/ |
---|
31 | if (iset.eq.0) then |
---|
32 | 1 call RANLUX(RTEST,2) |
---|
33 | |
---|
34 | v1=2.*RTEST(1)-1. |
---|
35 | v2=2.*RTEST(2)-1. |
---|
36 | rsq=v1**2+v2**2 |
---|
37 | if(rsq.ge.1..or.rsq.eq.0.)goto 1 |
---|
38 | fac=sqrt(-2.*log(rsq)/rsq) |
---|
39 | gset=v1*fac |
---|
40 | gasdevlux=v2*fac |
---|
41 | iset=1 |
---|
42 | else |
---|
43 | gasdevlux=gset |
---|
44 | iset=0 |
---|
45 | endif |
---|
46 | return |
---|
47 | END |
---|
48 | |
---|
49 | subroutine gasdevlux2R(random1,random2) |
---|
50 | USE luxury |
---|
51 | INTEGER idum |
---|
52 | REAL random1,random2 |
---|
53 | INTEGER iset |
---|
54 | REAL fac,gset,rsq,v1,v2,RTEST(2) |
---|
55 | |
---|
56 | 1 call RANLUX(RTEST,2) |
---|
57 | |
---|
58 | v1=2.*RTEST(1)-1. |
---|
59 | v2=2.*RTEST(2)-1. |
---|
60 | rsq=v1**2+v2**2 |
---|
61 | if(rsq.ge.1..or.rsq.eq.0.)goto 1 |
---|
62 | fac=sqrt(-2.*log(rsq)/rsq) |
---|
63 | random1=v1*fac |
---|
64 | random2=v2*fac |
---|
65 | ! Limit the random numbers to lie within the interval -4 and +4 |
---|
66 | !************************************************************** |
---|
67 | if (random1.lt.-4.) random1=-4. |
---|
68 | if (random2.lt.-4.) random2=-4. |
---|
69 | if (random1.gt.4.) random1=4. |
---|
70 | if (random2.gt.4.) random2=4. |
---|
71 | return |
---|
72 | END |
---|
73 | |
---|