Functions continued

In the last exercise we made a start with functions. Also, we looked at how we could get help on using functions.

When getting help on the mean function, you saw that it takes an argument x. X here is just an arbitrary name for the object that you want to find the mean of. Usually this object will be an R vector. We also saw the .... This is called an elipsis and is used to provide a number of optional arguments to the function.

Remember that R can match arguments both by position and by name. Let's say we want to find the mean of a vector called temperature. An example of matching by name is the following:

mean(x = temperature)

An example of matching by position is the following:

mean(temperature)

In this exercise, we have provided you with a vector of 5 numbers. There are the grades that you got during the semester.

Calculate the mean of the vector grades using matching by position
Calculate the mean of the vector grades using matching by name

Exercise

Functions continued

Instructions