R help - Feb 2012 - Get identical results for parallel and sequential?

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? 

Thanks. 
Libo

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Please do not double post.

Uwe Ligges


On 11.02.2012 23:20, 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?
>
> Thanks.
> Libo
>
> --
> View this message in context:
http://r.789695.n4.nabble.com/Get-identical-results-for-parallel-and-sequential-tp4380110p4380110.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at 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.

Sorry. That was my first time to post, I was not sure if it worked or not.

Libo

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