Easy way of counting precision, recall and F1-score in R

Question

I am using an rpart classifier in R. The question is - I would want to test the trained classifier on a test data. This is fine - I can use the predict.rpart<

Answer 1

We can simply get F1 value from caret's confusionMatrix function

result <- confusionMatrix(Prediction, Lable)

# View confusion matrix overall
result 

# F1 value
result$byClass[7]