For arrays, matrices, vectors, lists, and expressions, in command line R, there are a number of functions that describe various attributes of an object. In R Studio, many attributes, such as the number of columns in a matrix or the length of a list, are given to the right of the object name under the “Environment” tab in the upper right window.
Also, there are a number of functions that manipulate objects to create new objects. The functions covered in this chapter are the descriptive functions dim(), nrow(), NROW(), ncol(), NCOL(), length(), nchar(), ...
