Matrix definition
A matrix is a 
grid of numbers, represented by a bold capital letter. The number of rows in a matrix is represented by i; the number of columns is represented by j.
For example, in a 3 X 2 matrix, i would be 3 and j would be 2. This 3 X 2 matrix looks like this:
Matrices can be of any dimension; in video games, we tend to use 2 X 2, 3 X 3, and 4 X 4 matrices. If a matrix has the same number of rows and columns, it is called a square matrix. In this book, we're going to be working mostly with square matrices.
Individual elements of ...
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