A list is a multidimensional data structure in R. It can hold keys and lists of lists. Often, you would like to extract the values from a list. You can do this by "flattening" it into a vector. In this article, we will learn how to fallten a list into a vector in R.

For example, let's say we have a list of numbers. We can't use normal functions like `mean`

on this as the list is multidimensional, hence why we use the double brackets to access. We can use the `unlist`

function to turn the list into a vector.

```
scores = list(10, 20, 30, 40)
scores.vec = unlist(scores)
mean(scores.vec)
```