[R] convert a splus randomforest object to R

[Liaw, Andy]

You really need to follow the suggestions in the posting guide to get the best help from this list.  

Which versions of randomForest are you using in S-PLUS and R?  Which version of R are you using?  When you restore the object into R, what does str(object) say?  Have you also tried dump()/source() as the R Data Import/Export manual suggests?

Andy 

> -----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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