Explanation:Each variable forms a column in tidy data. 8. Which of the following function is used for casting data frames ?
A. dcast
B. ucast
C. rcast
D. All of the mentioned
Answer:A
Explanation:Each variable forms a column in tidy data. 8. Which of the following function is used for casting data frames ?
A. dcast B. ucast C. rcast D. All of the mentioned
Explanation:Use acast or dcast depending on whether you want vector/matrix/array output or data frame output. 9. Which of the following join is by default used in plyr package ?