| 3820ca8e |
1 | |
| 2 | CDECK ID>, HWR. |
| 3 | |
| 4 | *CMZ :- -26/04/91 12.42.30 by Federico Carminati |
| 5 | |
| 6 | *-- Author : F. James, modified by Mike Seymour |
| 7 | |
| 8 | C----------------------------------------------------------------------- |
| 9 | |
| 10 | FUNCTION HWRGEN(I) |
| 11 | |
| 12 | C----------------------------------------------------------------------- |
| 13 | |
| 14 | C MAIN RANDOM NUMBER GENERATOR |
| 15 | |
| 16 | C USES METHOD OF l'Ecuyer, (VIA F.JAMES, COMP PHYS COMM 60(1990)329) |
| 17 | |
| 18 | C----------------------------------------------------------------------- |
| 19 | |
| 20 | IMPLICIT NONE |
| 21 | |
| 22 | DOUBLE PRECISION HWRGEN,HWRSET,HWRGET |
| 23 | |
| 24 | INTEGER I,ISEED(2),K,IZ,JSEED(2) |
| 25 | |
| 26 | SAVE ISEED |
| 27 | |
| 28 | DATA ISEED/12345,67890/ |
| 29 | |
| 30 | K=ISEED(1)/53668 |
| 31 | |
| 32 | ISEED(1)=40014*(ISEED(1)-K*53668)-K*12211 |
| 33 | |
| 34 | IF (ISEED(1).LT.0) ISEED(1)=ISEED(1)+2147483563 |
| 35 | |
| 36 | K=ISEED(2)/52774 |
| 37 | |
| 38 | ISEED(2)=40692*(ISEED(2)-K*52774)-K*3791 |
| 39 | |
| 40 | IF (ISEED(2).LT.0) ISEED(2)=ISEED(2)+2147483399 |
| 41 | |
| 42 | IZ=ISEED(1)-ISEED(2) |
| 43 | |
| 44 | IF (IZ.LT.1) IZ=IZ+2147483562 |
| 45 | |
| 46 | HWRGEN=DBLE(IZ)*4.656613001013252D-10 |
| 47 | |
| 48 | C---> (4.656613001013252D-10 = 1.D0/2147483589) |
| 49 | |
| 50 | RETURN |
| 51 | |
| 52 | C----------------------------------------------------------------------- |
| 53 | |
| 54 | ENTRY HWRSET(JSEED) |
| 55 | |
| 56 | C----------------------------------------------------------------------- |
| 57 | |
| 58 | IF (JSEED(1).EQ.0.OR.JSEED(2).EQ.0) CALL HWWARN('HWRSET',99,*999) |
| 59 | |
| 60 | ISEED(1)=JSEED(1) |
| 61 | |
| 62 | ISEED(2)=JSEED(2) |
| 63 | |
| 64 | HWRSET=0.0D0 |
| 65 | |
| 66 | 999 RETURN |
| 67 | |
| 68 | C----------------------------------------------------------------------- |
| 69 | |
| 70 | ENTRY HWRGET(JSEED) |
| 71 | |
| 72 | C----------------------------------------------------------------------- |
| 73 | |
| 74 | JSEED(1)=ISEED(1) |
| 75 | |
| 76 | JSEED(2)=ISEED(2) |
| 77 | |
| 78 | HWRGET=0.0D0 |
| 79 | |
| 80 | RETURN |
| 81 | |
| 82 | END |
git://git.uio.no / u / mrichter / AliRoot.git / blame