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