Lists Flashcards
1
Q
What does a list do?
A
A list in R allows you to gather a variety of objects under one name (that is, the name of the list) in an ordered way. These objects can be matrices, vectors, data frames, even other lists, etc.
2
Q
What is the function to create a list?
A
list()
Ex: list(my_vec1, my_mat, my_vec2, my_df, …) OR list(name1 = my_vec1, name2 = my_mat, name3 = my_vec2, name4 = my_df)
3
Q
How can you assign names to items in a list after creating it?
A
names()
Ex: names(my_list) <- c(“name1”, “name2”, “name3”, …)
4
Q
How can you select a single component from a list?
A
[[]] OR $
Ex: my_list[[1]] OR my_list[[“diameter”]]
Ex: my_list$diameter
5
Q
How can you select a single element from a component of a list?
A
[[]][]
Ex: my_list[[1]][2]
