Error in as.data.frame.default(x) : cannot coerce class ‘c("rand_forest", "model_spec")’ to a data.frame

[FrieseWoudloper]

I installed parsnip and tried to fit a very simple random forest model. I ran this code:

library(parsnip)
library(titanic)

rand_forest() %>%
  set_mode("classification") %>%
  set_engine("randomForest") %>%
  set_args(trees = 1000, importance = TRUE) %>%
  fit(factor(Survived) ~ factor(Sex) + factor(Embarked), data = titanic_train)

It returned an error:

Error in as.data.frame.default(x) : 
  cannot coerce class ‘c("rand_forest", "model_spec")’ to a data.frame

It took me quite some time to figure out the solution was easy: install.package('randomForest')

It would be nice to get an error message that clearly states the problem: the randomForest package isn't installed.

[topepo]

Fixed in #293

You should now see:

> library(titanic)
> 
> rand_forest() %>%
+   set_mode("classification") %>%
+   set_engine("randomForest") %>%
+   set_args(trees = 1000, importance = TRUE) %>%
+   fit(factor(Survived) ~ factor(Sex) + factor(Embarked), data = titanic_train)
Error: This engine requires some package installs: 'randomForest'

[github-actions]

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