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setall.f
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1996-09-28
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SUBROUTINE setall(iseed1,iseed2)
C**********************************************************************
C
C SUBROUTINE SETALL(ISEED1,ISEED2)
C SET ALL random number generators
C
C Sets the initial seed of generator 1 to ISEED1 and ISEED2. The
C initial seeds of the other generators are set accordingly, and
C all generators states are set to these seeds.
C
C This is a transcription from Pascal to Fortran of routine
C Set_Initial_Seed 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 ISEED1 -> First of two integer seeds
C INTEGER ISEED1
C
C ISEED2 -> Second of two integer seeds
C INTEGER ISEED1
C
C**********************************************************************
C .. Parameters ..
INTEGER numg
PARAMETER (numg=32)
C ..
C .. Scalar Arguments ..
INTEGER iseed1,iseed2
LOGICAL qssd
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,ocgn
LOGICAL qqssd
C ..
C .. External Functions ..
INTEGER mltmod
LOGICAL qrgnin
EXTERNAL mltmod,qrgnin
C ..
C .. External Subroutines ..
EXTERNAL getcgn,initgn,inrgcm,setcgn
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/,qqssd
C ..
C .. Data statements ..
DATA qqssd/.FALSE./
C ..
C .. Executable Statements ..
C
C TELL IGNLGI, THE ACTUAL NUMBER GENERATOR, THAT THIS ROUTINE
C HAS BEEN CALLED.
C
qqssd = .TRUE.
CALL getcgn(ocgn)
C
C Initialize Common Block if Necessary
C
IF (.NOT. (qrgnin())) CALL inrgcm()
ig1(1) = iseed1
ig2(1) = iseed2
CALL initgn(-1)
DO 10,g = 2,numg
ig1(g) = mltmod(a1vw,ig1(g-1),m1)
ig2(g) = mltmod(a2vw,ig2(g-1),m2)
CALL setcgn(g)
CALL initgn(-1)
10 CONTINUE
CALL setcgn(ocgn)
RETURN
ENTRY rgnqsd(qssd)
C**********************************************************************
C
C SUBROUTINE RGNQSD
C Random Number Generator Query SeeD set?
C
C Returns (LOGICAL) QSSD as .TRUE. if SETALL has been invoked,
C otherwise returns .FALSE.
C
C**********************************************************************
qssd = qqssd
RETURN
END