Reading rpart Input Parameters from a Text Variable

Question

I\'m using rpart to make a decision tree. For example:

fit <- rpart(Kyphosis ~ Age + Number + Start, data=kyphosis)

How do

Answer 1

Use as.formula:

rpart_formula <- as.formula(
    paste("Kyphosis ~ ", 
          paste(predictor_variables, collapse = " + "), 
          sep = ""
    )
)