Let us create our first list! To construct a list you use the function list():
my_list <- list(comp1, comp2 ...)
The arguments to the list function are the list components. Remember, these components can be matrices, vectors, other lists, ...
Construct a list, named my_list, that contains the variables my_vector, my_matrix and my_df as list components.
# Vector with numerics from 1 up to 10
my_vector <- 1:10
# Matrix with numerics from 1 up to 9
my_matrix <- matrix(1:9, ncol = 3)
# First 10 elements of the built-in data frame mtcars
my_df <- mtcars[1:10,]
# Construct list with these different elements:
my_list <-
# Vector with numerics from 1 up to 10
my_vector <- 1:10
# Matrix with numerics from 1 up to 9
my_matrix <- matrix(1:9, ncol = 3)
# First 10 elements of the built-in data frame mtcars
my_df <- mtcars[1:10,]
# Construct list with these different elements:
my_list <- list(my_vector, my_matrix, my_df)
msg = "Do not remove or change the definition of the variables `my_vector`, `my_matrix` or `my_df`!"
test_object("my_vector", undefined_msg = msg, incorrect_msg = msg)
test_object("my_matrix", undefined_msg = msg, incorrect_msg = msg)
test_object("my_df", undefined_msg = msg, incorrect_msg = msg)
test_object("my_list",
incorrect_msg = "It looks like `my_list` does not contain the correct elements. Make sure to pass the variables `my_vector`, `my_matrix` and `my_df` to the `list()` function, separated by commas, in this order.")
success_msg("Wonderful! Head over to the next exercise.")
Use the list() function with my_vector, my_matrix and my_df as arguments separated by a comma.