In a vanilla R 2.14.0 GUI session (on Windows XP SP3):
> library(parallel)
> cl<-makePSOCKcluster(2)
> RNGkind()
[1] "Mersenne-Twister" "Inversion"
> clusterSetRNGStream(cl)
> RNGkind()
[1] "L'Ecuyer-CMRG" "Inversion"
> stopCluster(cl)
Is it intentional that clusterSetRNGStream() changes the RNG kind in
the master process? The code of clusterSetRNGStream() suggests that
it is not: the old random number seed is saved in 'oldseed' and then
assigned to '.Random.seed':
.Random.seed <- oldseed
(https://svn.r-project.org/R/trunk/src/library/parallel/R/RngStream.R,
line 45). However, if the intent is to restore the old seed then
this assignment should be made in the global environment, e.g. via
assign(".Random.seed", oldseed, envir = .GlobalEnv)
J. R. M. Hosking
> sessionInfo()
R version 2.14.0 (2011-10-31)
Platform: i386-pc-mingw32/i386 (32-bit)
locale:
[1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United
States.1252 LC_MONETARY=English_United States.1252 LC_NUMERIC=C
[5] LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
