Question

I have a randomForest object that I want to save for later use. I’ve tried some of the following but with no luck.

save(topDawg , file="myRFobject.RData")

This just saves a string “topDawg”

> formula(topDawg)
Error in formula.default(topDawg) : invalid formula


> save(getTree(topDawg))
Error in save(getTree(topDawg)) : object ‘getTree(topDawg)’ not found

Any suggestions?

Answer 1

I’m not sure exactly what you’re trying to do here, since normally you save an object and then load it later, like this:

set.seed(71)
> irisrf <- randomForest(Species ~ ., data=iris, importance=TRUE,
+                         proximity=TRUE)
> save(irisrf,file = "irisrf.RData")
> 
> rm(irisrf)
> print(irisrf)
Error in print(irisrf) : object 'irisrf' not found
> 
> load("irisrf.RData")
> print(irisrf)

Call:
 randomForest(formula = Species ~ ., data = iris, importance = TRUE,      proximity = TRUE) 
               Type of random forest: classification
                     Number of trees: 500
No. of variables tried at each split: 2

        OOB estimate of  error rate: 4.67%
Confusion matrix:
           setosa versicolor virginica class.error
setosa         50          0         0        0.00
versicolor      0         47         3        0.06
virginica       0          4        46        0.08