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SUBROUTINE advnst(k)
C**********************************************************************
C
C SUBROUTINE ADVNST(K)
C ADV-a-N-ce ST-ate
C
C Advances the state of the current generator by 2^K values and
C resets the initial seed to that value.
C
C This is a transcription from Pascal to Fortran of routine
C Advance_State from the paper
C
C L'Ecuyer, P. and Cote, S. "Implementing a Random Number Package
C with Splitting Facilities." ACM Transactions on Mathematical
C Software, 17:98-111 (1991)
C
C
C Arguments
C
C
C K -> The generator is advanced by2^K values
C INTEGER K
C
C**********************************************************************
include '../stack.h'
C .. Parameters ..
INTEGER numg
PARAMETER (numg=32)
C ..
C .. Scalar Arguments ..
INTEGER k
C ..
C .. Scalars in Common ..
INTEGER a1,a1vw,a1w,a2,a2vw,a2w,m1,m2
C ..
C .. Arrays in Common ..
INTEGER cg1(numg),cg2(numg),ig1(numg),ig2(numg),lg1(numg),
+ lg2(numg)
LOGICAL qanti(numg)
C ..
C .. Local Scalars ..
INTEGER g,i,ib1,ib2
C ..
C .. External Functions ..
INTEGER mltmod
LOGICAL qrgnin
EXTERNAL mltmod,qrgnin
C ..
C .. External Subroutines ..
EXTERNAL getcgn,setsd
C ..
C .. Common blocks ..
COMMON /globe/m1,m2,a1,a2,a1w,a2w,a1vw,a2vw,ig1,ig2,lg1,lg2,cg1,
+ cg2,qanti
C ..
C .. Save statement ..
SAVE /globe/
C ..
C .. Executable Statements ..
C Abort unless random number generator initialized
IF (qrgnin()) GO TO 10
call basout(io,wte,'ADVNST called before random number generator')
return
10 CALL getcgn(g)
C
ib1 = a1
ib2 = a2
DO 20,i = 1,k
ib1 = mltmod(ib1,ib1,m1,ierr)
ib2 = mltmod(ib2,ib2,m2,ierr)
20 CONTINUE
CALL setsd(mltmod(ib1,cg1(g),m1,ierr),mltmod(ib2,cg2(g),m2,ierr))
C
C NOW, IB1 = A1**K AND IB2 = A2**K
C
RETURN
END
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