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
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