convert a splus randomforest object to R

-----Original Message-----
From: r-help-bounces at r-project.org 
[mailto:r-help-bounces at r-project.org] On Behalf Of Zhiming Ni
Sent: Tuesday, August 02, 2011 8:11 PM
To: r-help at r-project.org
Subject: [R] convert a splus randomforest object to R

Hi,
 
I have a randomforest object "cost.rf" that was created in splus 8.0,
now I need to use this trained RF model in R. So in Splus, I 
dump the RF
file as below
 
data.dump("cost.rf", file="cost.rf.txt", oldStyle=T) 

then in R, restore the dumped file,

library(foreign)

data.restore("cost.rf.txt")

it works fine and able to restore the "cost.rf" object. But when I try
to pass a new data through this randomforest object using predict()
function, it gives me error message.

in R:

library(randomForest)
set.seed(2211)

pred <- predict(cost.rf, InputData[ , ])

Error in object$forest$cutoff : $ operator is invalid for 
atomic vectors


Looks like after restoring the dump file, the object is not compatible
in R. Have anyone successfully converted a splus randomforest 
object to
R? what will be the appropriate method to do this?

Thanks in advance.

Jimmy

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