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> ## https://github.com/bethatkinson/rpart/issues/7
> 
> library(rpart)
> mtcars2 <- mtcars
> 
> mtcars2$gear <- factor(mtcars2$gear)
> mtcars2$carb <- factor(mtcars2$carb)
> 
> set.seed(10)
> rp1 <- rpart(mpg ~ . - gear, data = mtcars2)
> set.seed(10)
> rp2 <- rpart(mpg ~ ., data = mtcars2[names(mtcars2) != "gear"])
> 
> all.equal(rp1[setdiff(names(rp1), c("call", "terms"))],
+           rp2[setdiff(names(rp2), c("call", "terms"))], check.attributes=FALSE)
[1] TRUE
> 
> 
> set.seed(10)
> rp3 <- rpart(mpg ~ . - gear - carb, data = mtcars2)
> set.seed(10)
> rp4 <- rpart(mpg ~ ., data = mtcars2[setdiff(names(mtcars2), c("gear", "carb"))])
> 
> all.equal(rp3[setdiff(names(rp3), c("call", "terms"))],
+           rp4[setdiff(names(rp4), c("call", "terms"))], check.attributes=FALSE)
[1] TRUE
> 
> proc.time()
   user  system elapsed 
  0.167   0.052   0.236