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What are vectors?
Vector operations
9. Arithmetic with vectors
Indexing and filtering
Simple analysis
Summary

## Instruction

Correct! We can also perform calculations with two vectors of the same length. Just as before, the operations will be memberwise. The result is a third vector. Here is an example:

salaries + bonuses

Here is how R will calculate the result:

  salaries 3400 2800 5600 4200 3100 3800 ...
+ bonuses   400  800  600  200  100  800 ...
--------------------------------------------
=          3800 3600 6200 4400 3200 4600 ...


## Exercise

We'd like to see how the employee salaries for this year changed from the ones for last year. No one was fired/hired in the course of this year.

The employee salaries from a year ago are stored in a vector named salaries_last_year. This year's salaries are stored in the vector salaries. Create the vector called salaries_difference representing salary differences between this year and the last year.