[R] can you tell what .Random.seed *was*?

G. Jay Kerns gkerns at ysu.edu
Thu May 14 21:36:13 CEST 2009

Dear R-help,

Suppose I write a script that looks something like this:

#### script.R


x <- rnorm(100)
y <- runif(500)
# bunch of other stuff


### end of script.R

Now, I give you a copy of my script.R (with the set.seed statement
removed, of course) together with the .RData file that was generated
by the save.image() command.

1) can you tell me what my original set.seed() value was?  (I wouldn't
be able to figure it out, but maybe someone can)

2) is it possible *in principle* to figure out what set.seed was,
given the above?  (OK, being able to figure it out in 2*10^68 years
doesn't count, but within a couple months is acceptable.)

3) does the answer change if there is a


command right before the save.image() command?

Any thoughts would be appreciated.


G. Jay Kerns, Ph.D.
Associate Professor
Department of Mathematics & Statistics
Youngstown State University
Youngstown, OH 44555-0002 USA
Office: 1035 Cushwa Hall
Phone: (330) 941-3310 Office (voice mail)
-3302 Department
-3170 FAX
E-mail: gkerns at ysu.edu

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