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 each 
node 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 am I 
doing 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 the 
same 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


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