ls() looks in its calling environment, which in this case would be the internals of the snow mechnism. If you want ls of the global environment use one of
clusterEvalQ(cl, ls())
clusterCall(cl, ls, .GlobalEnv)
luke
On Wed, 10 Sep 2008, [EMAIL PROTECTED] wrote:
Many thanks. Yes, weird, somehow ls does not show the variables in the environment, even though they are clearly there. It would be nice to understand why that is the case, just to be clear about what is going on. Thanks Markus, Tolga Markus Schmidberger <[EMAIL PROTECTED]> 10/09/2008 10:45 Please respond to [EMAIL PROTECTED] To [EMAIL PROTECTED] cc r-help@r-project.org Subject Re: [R] cluster/snow question Hi Tolga, I am not sure why ls() is showing only "args" and "fun". But x is at the nodes. Try this: clusterEvalQ(cl,x<-x+3) [[1]] [1] 4 [[2]] [1] 4 clusterCall(cl,function()x+5) [[1]] [1] 9 [[2]] [1] 9 Best Markus [EMAIL PROTECTED] schrieb:Dear R Users, Apologies for a somewhat basic cluster question. I am trying to come to grips with how variables are instantiated within the environment of eachnode in a cluster. When I run the following code, I expect to see the variable "x" in the environment of each node, but fail to do so. What amIdoing wrong ? library(snow) noclusters<-2 cl <- makeCluster(noclusters, type = "SOCK") clusterCall(cl,ls) x<-1 clusterExport(cl,"x") clusterCall(cl,ls) #expect to see x in the environment, but get back thesame result as in the call above stopCluster(cl)library(snow) noclusters<-2 cl <- makeCluster(noclusters, type = "SOCK") clusterCall(cl,ls)[[1]] [1] "args" "fun" [[2]] [1] "args" "fun"x<-1 clusterExport(cl,"x") clusterCall(cl,ls) #expect to see x in the environment[[1]] [1] "args" "fun" [[2]] [1] "args" "fun"stopCluster(cl)Thanks in advance, Tolga Generally, this communication is for informational purposes only and it is not intended as an offer or solicitation for the purchase or sale of any financial instrument or as an official confirmation of any transaction. 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[[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guidehttp://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.-- Dipl.-Tech. Math. Markus Schmidberger Ludwig-Maximilians-Universit?? M??chen IBE - Institut f?? medizinische Informationsverarbeitung, Biometrie und Epidemiologie Marchioninistr. 15, D-81377 Muenchen URL: http://ibe.web.med.uni-muenchen.de Mail: Markus.Schmidberger [at] ibe.med.uni-muenchen.de Tel: +49 (089) 7095 - 4599 Generally, this communication is for informational purposes only and it is not intended as an offer or solicitation for the purchase or sale of any financial instrument or as an official confirmation of any transaction. 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