*
* $Id: quasi.F,v 1.1.1.1 1996/04/01 15:03:24 mclareni Exp $
*
* $Log: quasi.F,v $
* Revision 1.1.1.1  1996/04/01 15:03:24  mclareni
* Mathlib gen
*
*
#include "gen/pilot.h"
      SUBROUTINE QUASI (X,NDIM,NGIVE,NF)
C--      CORRECTED 830401 CERN GEN PAM 1.05
C--      INITIAL VALUE OF I CHANGED FROM 1 TO 2 FOR CASE OF NPT LT 7
C--      CORRECTED 850503 CERN GEN PAM 1.16
C--      17'TH IN LIST OF PRIME NUMBERS CORRECTED FROM 1197 TO 1187
      INTEGER NDIM,N,NGIVE
      REAL X(10,NGIVE)
      INTEGER PRIME(21),AA(20,9)
      REAL THETA(10)
      INTEGER D0,N0,A,P,IPT
      DATA D0,N0 /2*0/
      DATA PRIME / 7,19,29,37,47,97,149,199,293,397,499,599,691,797,887,
     1997,1187, 1499,1789,1999,9999999 /
      DATA AA / 2,7,12,27,29,61,44,76,81,163,209,165,390,346,192,705, 65
     16,629,1037,878, 2,3,20,13,30,78,67,73,103,274,405,248,585,305,674,
     2650, 358,526,1540,1082, 2,9,21,16,37,64,29,114,211,157,241,472,371
     3,477,113,252, 736,1205,853,1486, 2,2,27,35,44,8,110,42,258,104,445
     4,21,640,665,678,535, 1003,56,1634,1781, 2,17,15,29,38,76,85,183,28
     5,356,452,522,655,787,841,697, 1073,1025,1025,962, 2,17,2,2,2,67,12
     68,94,257,393,395,395,355,341,397,361, 383,367,383,398, 2,17,2,19,2
     7,79,139,149,170,165,169,161,157,171,149,167, 157,171,133,151, 2,17
     8,2,19,45,2,139,67,170,87,169,85,157,89,81,167,157,75,89,83, 2,17,2
     97,35,45,47,51,45,170,87,53,51,157,89,81,167,157,53,53,53 /
      N=ABS(NF)
      IF(NGIVE.LT.1.OR.NGIVE.GT.N) NGIVE=N
      IF(N.EQ.N0 .AND. NDIM.EQ.D0) GOTO 60
      N0=N
      D0=NDIM
      IPT=0
C--      INITIAL VALUE CHANGED FROM 1 TO 2, PAM 1.05
      I=2
      GOTO 20
 10   I=I+1
 20   IF((I).GT.(21)) GOTO 30
      IF(PRIME(I).LE.N) GOTO 10
 30   P=PRIME(I-1)
      A=AA(I-1,NDIM-1)
      THETA(1)=1.0E+0
      THETA(2)=A
      DO 40 I=3,NDIM
      THETA(I)=MOD(THETA(2)*THETA(I-1),REAL(P))
 40   CONTINUE
      DO 50 I=1,NDIM
      THETA(I)=THETA(I)/P
 50   CONTINUE
 60   IF(IPT+NGIVE.GT.P) NGIVE=P-IPT
      IF(NF.LT.0) RETURN
      DO 80 K=1,NGIVE
      IPT=IPT+1
      DO 70 I=1,NDIM
      TERM=IPT*THETA(I)
      X(I,K)=ABS(2.0E+0*MOD(TERM,1.0E+0)-1.0E+0)
 70   CONTINUE
 80   CONTINUE
      IF(IPT.EQ.P) IPT=0
      RETURN
      END