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SUBROUTINE setant(qvalue)
C**********************************************************************
C
C SUBROUTINE SETANT(QVALUE)
C SET ANTithetic
C
C Sets whether the current generator produces antithetic values. If
C X is the value normally returned from a uniform [0,1] random
C number generator then 1 - X is the antithetic value. If X is the
C value normally returned from a uniform [0,N] random number
C generator then N - 1 - X is the antithetic value.
C
C All generators are initialized to NOT generate antithetic values.
C
C This is a transcription from Pascal to Fortran of routine
C Set_Antithetic 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 QVALUE -> .TRUE. if generator G is to generating antithetic
C values, otherwise .FALSE.
C LOGICAL QVALUE
C
C**********************************************************************
include '../stack.h'
C .. Parameters ..
INTEGER numg
PARAMETER (numg=32)
C ..
C .. Scalar Arguments ..
LOGICAL qvalue
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
C ..
C .. External Functions ..
LOGICAL qrgnin
EXTERNAL qrgnin
C ..
C .. External Subroutines ..
EXTERNAL getcgn
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,'SETANT called before random number generator')
return
10 CALL getcgn(g)
qanti(g) = qvalue
RETURN
END
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