On 11.02.2012 23:12, slbfelix wrote:
Hi All,
I have a question about R parallel computing by using snowfall.
How can I set the seeds on parallel workers to get the same result as
sequential mode?
For example:
sfSapply(c(1,1),rnorm)
[1] 1.823082 -2.222052
rnorm(2)
[1] -0.5179967 -1.0807196
How to get the identical result?
I don't think you easily can do it, since each node in a cluster has its
own stream. Repoducing this on a different number of nodes would mean to
jump around in the RNG stream whcih would be slow (and probably needs
some programming work).
For a start, read ?RNG
Uwe Ligges
Thanks.
Libo Sun
Graduate Student,
Department of Statistics,
Colorado State University
Fort Collins, CO
--
View this message in context:
http://r.789695.n4.nabble.com/R-Parallel-question-tp4380098p4380098.html
Sent from the R help mailing list archive at Nabble.com.
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
