GNU Octave  4.0.0 A high-level interpreted language, primarily intended for numerical computations, mostly compatible with Matlab
setant.f
Go to the documentation of this file.
1  SUBROUTINE setant(qvalue)
2 C**********************************************************************
3 C
4 C SUBROUTINE SETANT(QVALUE)
5 C SET ANTithetic
6 C
7 C Sets whether the current generator produces antithetic values. If
8 C X is the value normally returned from a uniform [0,1] random
9 C number generator then 1 - X is the antithetic value. If X is the
10 C value normally returned from a uniform [0,N] random number
11 C generator then N - 1 - X is the antithetic value.
12 C
13 C All generators are initialized to NOT generate antithetic values.
14 C
15 C This is a transcription from Pascal to Fortran of routine
16 C Set_Antithetic from the paper
17 C
18 C L'Ecuyer, P. and Cote, S. "Implementing a Random Number Package
19 C with Splitting Facilities." ACM Transactions on Mathematical
20 C Software, 17:98-111 (1991)
21 C
22 C
23 C Arguments
24 C
25 C
26 C QVALUE -> .TRUE. if generator G is to generating antithetic
27 C values, otherwise .FALSE.
28 C LOGICAL QVALUE
29 C
30 C**********************************************************************
31 C .. Parameters ..
32  INTEGER numg
33  parameter(numg=32)
34 C ..
35 C .. Scalar Arguments ..
36  LOGICAL qvalue
37 C ..
38 C .. Scalars in Common ..
39  INTEGER a1,a1vw,a1w,a2,a2vw,a2w,m1,m2
40 C ..
41 C .. Arrays in Common ..
42  INTEGER cg1(numg),cg2(numg),ig1(numg),ig2(numg),lg1(numg),
43  + lg2(numg)
44  LOGICAL qanti(numg)
45 C ..
46 C .. Local Scalars ..
47  INTEGER g
48 C ..
49 C .. External Functions ..
50  LOGICAL qrgnin
51  EXTERNAL qrgnin
52 C ..
53 C .. External Subroutines ..
54  EXTERNAL getcgn
55 C ..
56 C .. Common blocks ..
57  COMMON /globe/m1,m2,a1,a2,a1w,a2w,a1vw,a2vw,ig1,ig2,lg1,lg2,cg1,
58  + cg2,qanti
59 C ..
60 C .. Save statement ..
61  SAVE /globe/
62 C ..
63 C .. Executable Statements ..
64 C Abort unless random number generator initialized
65  IF (qrgnin()) go to 10
66  WRITE (*,*) ' SETANT called before random number generator ',
67  + ' initialized -- abort!'
68  CALL xstopx
69  + (' SETANT called before random number generator initialized')
70
71  10 CALL getcgn(g)
72  qanti(g) = qvalue
73  RETURN
74
75  END
subroutine getcgn(g)
Definition: getcgn.f:1
subroutine setant(qvalue)
Definition: setant.f:1