[Rd] Weakness in Knuth-TAOCP RNG (fwd) (PR#1336)
schutz@wehi.edu.au
schutz@wehi.edu.au
Fri, 1 Mar 2002 07:06:38 +0100 (MET)
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Don Knuth recently updated its RNG, following the discovery of a
weakness in the seed initialisation (see
http://Sunburn.Stanford.EDU/~knuth/news02.html), so I believe that the
corresponding code in R should be updated as well. If it may be usefull,
I attach a patch to do the change.
Notes:
- only a few lines of code have really changed, but the order of the
functions has changed in Knuth's original code, so the patch is
longer than it should really be;
- Despite Knuth's request that no change should be made to the code,
the present R code (1.5.0-devel and previous) contains a change (the
line "long ran_x[KK];" is commented, and ran_x is defined elsewhere
in the program). The patch contains the _same_ change; I let you
decide if this is acceptable in regard to Knuth's request.
Frederic
--
Fr=E9d=E9ric SCH=DCTZ email: schutz@wehi.edu.au
Genetics and Bioinformatics Group
The Walter and Eliza Hall Institute of Medical Research
Phone: +61 3 9345 2627 Fax: +61 3 9347 0852
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Victoria, Australia
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