source: LMDZ6/trunk/libf/misc/ran1.F @ 3442

Last change on this file since 3442 was 2239, checked in by Ehouarn Millour, 10 years ago

Reorganizing physics/dynamics interface:

  • what is related to dynamics-physics interface is now in a seperate directory: dynlmdz_phy* for physics in phy*
  • 1d model and related dependencies (including a couple from "dynamics", set up as symbolic links) is now in subdirectory "dyn1d" of phy*.
  • "bibio" directory is now "misc" and should only contain autonomous utilities.
  • "cosp" is now a subdirectory of phylmd.

EM
  • Property copyright set to
    Name of program: LMDZ
    Creation date: 1984
    Version: LMDZ5
    License: CeCILL version 2
    Holder: Laboratoire de m\'et\'eorologie dynamique, CNRS, UMR 8539
    See the license file in the root directory
  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 1009 bytes
Line 
1!
2! $Id: ran1.F 2239 2015-03-23 07:27:30Z fairhead $
3!
4      FUNCTION RAN1(IDUM)
5      IMPLICIT NONE
6      REAL RAN1
7      REAL,SAVE :: R(97)
8      REAL,PARAMETER :: RM1=3.8580247E-6,RM2=7.4373773E-6
9      INTEGER,SAVE :: IFF=0
10      integer,save :: ix1,ix2,ix3
11      INTEGER,PARAMETER :: M1=259200,IA1=7141,IC1=54773
12      INTEGER,PARAMETER :: M2=134456,IA2=8121,IC2=28411
13      INTEGER,PARAMETER :: M3=243000,IA3=4561,IC3=51349
14      INTEGER :: IDUM,J
15
16      IF (IDUM.LT.0.OR.IFF.EQ.0) THEN
17        IFF=1
18        IX1=MOD(IC1-IDUM,M1)
19        IX1=MOD(IA1*IX1+IC1,M1)
20        IX2=MOD(IX1,M2)
21        IX1=MOD(IA1*IX1+IC1,M1)
22        IX3=MOD(IX1,M3)
23        DO 11 J=1,97
24          IX1=MOD(IA1*IX1+IC1,M1)
25          IX2=MOD(IA2*IX2+IC2,M2)
26          R(J)=(REAL(IX1)+REAL(IX2)*RM2)*RM1
2711      CONTINUE
28        IDUM=1
29      ENDIF
30      IX1=MOD(IA1*IX1+IC1,M1)
31      IX2=MOD(IA2*IX2+IC2,M2)
32      IX3=MOD(IA3*IX3+IC3,M3)
33      J=1+(97*IX3)/M3
34      IF(J.GT.97.OR.J.LT.1) stop 1
35      RAN1=R(J)
36      R(J)=(REAL(IX1)+REAL(IX2)*RM2)*RM1
37      RETURN
38      END
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