[R] randomForest Error passing string argument

[Liaw, Andy]

If all you need the formula interface for is auto deletion of NAs, I'd
suggest doing something like:


varlist <- c("fruit", "apples", "oranges", "blueberries")
fruits.nona <- na.omit(fruits.data[varlist])
model.rf <- randomForest(fruits.data[-1], fruits.data[[1]], ...)

If you want to know the call that produced model.rf, you can look at
model.rf$Call.

I hope that sort of answers your question.

Andy

> From: mmv
> 
> I'm attempting to pass a string argument into the function
> randomForest but I get an error:
> 
> state <- paste(list("fruit ~", "apples+oranges+blueberries",
> "data=fruits.data, mtry=2, do.trace=100, na.action=na.omit,
> keep.forest=TRUE"), sep= " ", collapse="")
> 
> model.rf <- randomForest(state)
> 
> Error in if (n==0) stop ("data(x) has 0 rows") argument is of 
> length zero.
> 
> -Thanks in advance,
> 
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