What are some examples of a matrix?
The dimensions of a matrix are the number of rows (horizontal numbers) and columns (vertical numbers); it is written as the rows first, columns second. The following are some simple examples of matrices—all differing in dimensions:
A 3 by 2 (3 × 2) matrix:
A 2 by 3 (2 × 3) matrix:
A 4 by 4 (4 × 4) matrix (when the row and column dimensions are the same, it is called a “square matrix”):