Chapter 3. Matrices and Arrays
A matrix is a vector with two additional attributes: the number of rows and the number of columns. Since matrices are vectors, they also have modes, such as numeric and character. (On the other hand, vectors are not one-column or one-row matrices.)
Matrices are special cases of a more general R type of object: arrays. Arrays can be multidimensional. For example, a three-dimensional array would consist of rows, columns, and layers, not just rows and columns as in the matrix case. Most of this chapter will concern matrices, but we will briefly discuss higher-dimensional arrays in the final section.
Much of R’s power ...
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