Lists differ from atomic vectors because their elements can be of any type, incl

Question

Lists differ from atomic vectors because their elements can be of any type, including lists, i.e., a lists is a recursive data structure. You construct lists by using list().

The first element of the list is a list with two elements given by [[1]][[1]] and [[1]][[2]]

The elements of the list can be named:

Now click the “Environment” tab on your R Studio and inspect the three objects in your “Global Environment”: l, l.recursive and l.named. Click the downward triangle icon to see the structure of l (and others). The same result is obtained by

Do the same for univ.data as you did for l:

How many elements are listed under univ.data?

Inspect univ.data$metadata. What is the structure of univ.data$metadata?

Notice that univ.data$results is a list of 3, and the first element has no name. Retrieve the first element and store it with a name results1.

List the names of elements within results1.

Explanation / Answer

How many elements are listed under univ.data?

Two elements are listed under univ.data.

1. metadata

2. results

Inspect univ.data$metadata. What is the structure of univ.data$metadata?

univ.data$metadata is a list of 3 elements

The structure of univ.data$metadata is shown below.

List of 3
$ total : int 3
$ page : int 0
$ per_page: int 20

List the names of elements within results1.

Using the command, to retrieve the first element and store it with a name results1.

results1 <- univ.data$results[[1]]

The names of 25 elements of results1 are -

2012, 2011, 2010, 2009, 1998, 2008, 1997, 2007, 1996, 2006, 2005, school, 2004, 2003, 2002, id, 1999, 2000, 2001, ope6_id, 2015, 2014, 2013, ope8_id, location

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