Problems with setting .Random.seed (PR#179)

[ripley@stats.ox.ac.uk]

I have commited fixes for 0.64.1 for

(1) From: Mai Zhou <mai@ms.uky.edu>
> .Random.seed <- c(1, 1:2)
> .Random.seed
[1] 1 1 2
> runif(5)
Warning: Wrong length .Random.seed; forgot initial RNGkind? set to
Wichmann-Hill[1] 0.02253721 0.84832584  ........

Here the length of the seed was being tested before the kind was
picked out, so the length of the previous type was used.

(2) 
> .Random.seed <- c(0, 30269, 30307, 30323)
> runif(1)
[1] 0
> .Random.seed
[1] 0 0 0 0

and it remains zero thereafter.

This was particularly invidious as the help has said (for a long time,
despite my commenting several times, even in the `R Complements')

          The seed, `.Random.seed[-1] == r[1:3]' is an
          integer vector of length 3, where each `r[i]' is
          in `1:p[i]', where `p' is the length 3 vector of
          primes, `p = (30269, 30307, 30323)'. The

This should be (and will be) 1:(p[1] - 1).

(3) The help page now says what the length of the seed is and the
restrictions for the "Marsaglia-Multicarry" and "Super-Duper" kinds
and corrects the description of the latter.

Brian

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595


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