Data Utilities

R features a bunch of functions to juggle around with data structures::

seq(): Generate sequences, by specifying the from, to, and by arguments.
rep(): Replicate elements of vectors and lists.
sort(): Sort a vector in ascending order. Works on numerics, but also on character strings and logicals.
rev(): Reverse the elements in a data structures for which reversal is defined.
str(): Display the structure of any R object.
append(): Merge vectors or lists.
is.*(): Check for the class of an R object.
as.*(): Convert an R object from one class to another.
unlist(): Flatten (possibly embedded) lists to produce a vector.

Remember the social media profile views data? Your LinkedIn and Facebook view counts for the last seven days are already defined as lists on the right.

Convert both linkedin and facebook lists to a vector, and store them as li_vec and fb_vec respectively.
Next, append fb_vec to the li_vec (Facebook data comes last). Save the result as social_vec.
Finally, sort social_vec from high to low. Print the resulting vector.

Take Hint (-30 XP)

Exercise

Data Utilities

Instructions