randomForest Error passing string argument
mmv wrote:
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="")
I really don't understand why you want it as a character.
I think you probably want to generate arguments dynamically and specify
them in form of a list, which leads to constructions using do.call() at
the end.
Anyway, if you really want to call randomForest with the abouve text, I
guess this is one of tzhe few circumstances where you can do
eval(parse(.....)):
state <- paste("fruit ~", "apples+oranges+blueberries,",
"data=fruits.data, mtry=2, do.trace=100, na.action=na.omit,
keep.forest=TRUE")
the_call <- paste("randomForest(", state, ")")
eval(parse(text=the_call))
Uwe Ligges
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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