To get started with this recipe, you must have R installed on your computer. You also need to understand the structure of a matrix and various operations. There is no library required for this recipe, but if you are interested in advanced matrix algebra, then you might consider the See also section of this recipe. A matrix is considered as a two-dimensional grid where each cell is represented by a row and column index and the value of the cell is the entries of the matrix. The cell may contain logical, numeric, or character elements.