Directory: | ./ |
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File: | misc/ran1.f |
Date: | 2022-01-11 19:19:34 |
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1 | ! | ||
2 | ! $Id: ran1.F 2239 2015-03-23 07:27:30Z emillour $ | ||
3 | ! | ||
4 | 5379 | 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 |
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5379 | IF (IDUM.LT.0.OR.IFF.EQ.0) THEN |
17 | 1 | IFF=1 | |
18 | 1 | IX1=MOD(IC1-IDUM,M1) | |
19 | 1 | IX1=MOD(IA1*IX1+IC1,M1) | |
20 | 1 | IX2=MOD(IX1,M2) | |
21 | 1 | IX1=MOD(IA1*IX1+IC1,M1) | |
22 | 1 | IX3=MOD(IX1,M3) | |
23 |
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98 | DO 11 J=1,97 |
24 | 97 | IX1=MOD(IA1*IX1+IC1,M1) | |
25 | 97 | IX2=MOD(IA2*IX2+IC2,M2) | |
26 | 97 | R(J)=(REAL(IX1)+REAL(IX2)*RM2)*RM1 | |
27 | 1 | 11 CONTINUE | |
28 | 1 | IDUM=1 | |
29 | ENDIF | ||
30 | 5379 | IX1=MOD(IA1*IX1+IC1,M1) | |
31 | 5379 | IX2=MOD(IA2*IX2+IC2,M2) | |
32 | 5379 | IX3=MOD(IA3*IX3+IC3,M3) | |
33 | 5379 | J=1+(97*IX3)/M3 | |
34 |
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5379 | IF(J.GT.97.OR.J.LT.1) stop 1 |
35 | 5379 | RAN1=R(J) | |
36 | 5379 | R(J)=(REAL(IX1)+REAL(IX2)*RM2)*RM1 | |
37 | RETURN | ||
38 | END | ||
39 |