| 1 | DOUBLE PRECISION FUNCTION RANNOR( A,B )
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| 2 |
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| 3 | C-----------------------------------------------------------------------
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| 4 | C RAN(DOM NUMBER) NOR(MALLY DISTRIBUTED)
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| 5 | C
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| 6 | C GENERATES NORMAL DISTRIBUTED RANDOM NUMBER
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| 7 | C DELIVERS 2 UNCORRELATED RANDOM NUMBERS,
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| 8 | C THEREFORE RANDOM CALLS ARE ONLY NECESSARY EVERY SECOND TIME.
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| 9 | C REFERENCE : NUMERICAL RECIPES, W.H. PRESS ET AL.,
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| 10 | C CAMBRIDGE UNIVERSITY PRESS, 1992 ISBN 0 521 43064 X
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| 11 | C THIS FUNCTION IS CALLED FROM HDPM, LEADDF, NIHILA, PARRAP, QGSTOR,
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| 12 | C UPDATE, AND VAPOR
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| 13 | C ARGUMENTS:
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| 14 | C A = MEAN VALUE
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| 15 | C B = STANDARD DEVIATION
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| 16 | C-----------------------------------------------------------------------
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| 17 |
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| 18 | IMPLICIT NONE
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| 19 | *KEEP,CONST.
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| 20 | COMMON /CONST/ PI,PI2,OB3,TB3,ENEPER
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| 21 | DOUBLE PRECISION PI,PI2,OB3,TB3,ENEPER
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| 22 | *KEEP,RANDPA.
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| 23 | COMMON /RANDPA/ FAC,U1,U2,RD,NSEQ,ISEED,KNOR
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| 24 | DOUBLE PRECISION FAC,U1,U2
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| 25 | REAL RD(3000)
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| 26 | INTEGER ISEED(103,10),NSEQ
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| 27 | LOGICAL KNOR
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| 28 | *KEEP,RUNPAR.
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| 29 | COMMON /RUNPAR/ FIXHEI,THICK0,HILOECM,HILOELB,
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| 30 | * STEPFC,NRRUN,NSHOW,PATAPE,MONIIN,
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| 31 | * MONIOU,MDEBUG,NUCNUC,
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| 32 | * CETAPE,
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| 33 | * SHOWNO,ISHW,NOPART,NRECS,NBLKS,MAXPRT,NDEBDL,
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| 34 | * N1STTR,MDBASE,
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| 35 | * DEBDEL,DEBUG,FDECAY,FEGS,FIRSTI,FIXINC,FIXTAR,
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| 36 | * FIX1I,FMUADD,FNKG,FPRINT,FDBASE
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| 37 | * ,GHEISH,GHESIG
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| 38 | COMMON /RUNPAC/ DSN,HOST,USER
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| 39 | DOUBLE PRECISION FIXHEI,THICK0,HILOECM,HILOELB
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| 40 | REAL STEPFC
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| 41 | INTEGER NRRUN,NSHOW,PATAPE,MONIIN,MONIOU,MDEBUG,NUCNUC,
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| 42 | * SHOWNO,ISHW,NOPART,NRECS,NBLKS,MAXPRT,NDEBDL,
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| 43 | * N1STTR,MDBASE
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| 44 | INTEGER CETAPE
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| 45 | CHARACTER*79 DSN
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| 46 | CHARACTER*20 HOST,USER
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| 47 |
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| 48 | LOGICAL DEBDEL,DEBUG,FDECAY,FEGS,FIRSTI,FIXINC,FIXTAR,
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| 49 | * FIX1I,FMUADD,FNKG,FPRINT,FDBASE
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| 50 | * ,GHEISH,GHESIG
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| 51 | *KEND.
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| 52 |
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| 53 | DOUBLE PRECISION A,B,RR
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| 54 | C-----------------------------------------------------------------------
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| 55 |
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| 56 | CC IF ( DEBUG ) WRITE(MDEBUG,100) SNGL(A),SNGL(B)
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| 57 | CC100 FORMAT(' RANNOR: A,B=',1P,2E10.3)
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| 58 | IF ( KNOR ) THEN
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| 59 | 1 CONTINUE
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| 60 | CALL RMMAR( RD,2,1 )
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| 61 | U1 = 2.D0*RD(1) - 1.D0
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| 62 | U2 = 2.D0*RD(2) - 1.D0
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| 63 | RR = U1**2 + U2**2
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| 64 | IF ( RR .GE. 1.D0 .OR. RR .EQ. 0.D0 ) GOTO 1
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| 65 | FAC = SQRT( -2.D0 * LOG(RR) / RR )
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| 66 |
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| 67 | RANNOR = FAC * U1 * B + A
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| 68 | KNOR = .FALSE.
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| 69 | ELSE
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| 70 | RANNOR = FAC * U2 * B + A
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| 71 | KNOR = .TRUE.
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| 72 | ENDIF
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| 73 | CC IF ( DEBUG ) WRITE(MDEBUG,101) RANNOR
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| 74 | CC101 FORMAT('+',34X,' RANNOR =',1P,E12.5)
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| 75 |
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| 76 | RETURN
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| 77 | END
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