Hey guys, pls bear with me as i'm very new to the list. i'm testing some
very simple codes with the doParallel package running Windows 7 on a Intel
i5 quad core. I ran the following snippet on a 32-bit version of Win 7 and
a 64-bit version. It ran fine on the 32-bit system, but failed on the
64-bit with the following error,

Error in unserialize(socklist[[n]]):
  ReadItem : unknown type 0, perhaps written by later version of R

I have R 3.0.0, with the randomForest loaded. Here is the code snippet,

library(doParallel)
library(foreach)
cl <- makeCluster(2)
registerDoParallel(cl)
system.time(rff <- foreach(ntree=rep(500, 2), .packages="randomForest",
.combine=combine)
            %dopar%
            {randomForest(train$x[samp,], as.factor(train$y[samp]),
xtest=test$x, ntree=ntree)
  })

Any tips appreciated.

Horace

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