What are vectors?
Vector operations
Indexing and filtering
13. Accessing single elements
Simple analysis
Summary

Instruction

Nicely done! What if we would like to or use only one specific element of a vector? Let's take a look at how this can be done.

The first element of the vector a <- c(8, 9, 10) can be accessed like this:

a[1]

Here, a is a vector. Inside the square brackets, we specify the index position (1) of the element we would like to retrieve. R will respond by printing the value of the first element in vector a. Likewise, we can access the second element by using an index of 2, like so:

a[2]

Note that some programming languages use 0 as the index position of the first element in a vector. However, R uses the index position 1 to reference the first element of a vector.

Exercise

Jamie was the first to arrive at Versico. Thus, his salary is the first element in the vector named salaries. Write a line of code that will retrieve Jamie's salary.