In this chapter, we first talked very briefly about what R is, where and how to get it, and how to install it. We then covered why we should use R and compared it with other available software. After that, we described what R objects are, their modes, and classes. We also highlighted how we can convert modes of objects using R functions, such as
as.character. Finally, we discussed different R objects, such as vector, factor, data frame, matrix, array, and list. The chapter ended with an introduction to how missing values are represented and dealt with in R.
In the next chapter, we will discuss data manipulation with different R objects in greater detail.