snow, socket cluster: problem with path to rscript

On Mon, 13 Apr 2009, Steve Weston wrote:

Hi Matthieu,

On Mon, Apr 13, 2009 at 4:46 AM, Matthieu Stigler
<matthieu.stigler at gmail.com> wrote:

Hello

I'm trying to set-up a cluster having three nodes with cluster 
type=SOCK.

I have a problem to give the path to the rscript (different on the two
machines).... I try to give full information (fill the list(host, 
rscript)
as in the makeCluster example)

[snip]

I'm really thankfull if you can give me advice and tell me wether I do
something wrong or not! Thanks a lot!
See:

library(snow)

#local host only
host212Full <-list(host = "dsge at 192.100.100.212", rscript =
"/usr/lib64/R/bin/Rscript")
makeCluster(c(rep(host212Full, 2)), type = "SOCK")

I think the immediate problem is the way that you're creating
the first argument to makeCluster.  Your code is concatenating
host212Full to itself, creating a list of length 4 with elements
that are not lists. I think you want to create a list of two lists,
each of length 2.

One way to create the appropriate list (which worked for me on
R 2.8.1) is:

makeCluster(rep(list(host212Full), 2), type = "SOCK")

I hope that helps.

Thanks -- the help page gets this wrong (in an example that is not run
) -- I'll fix that for the net release.

luke