Introduction to Matrices

A matrix is a group of numbers arranged in rows and columns in a rectangular pattern. In computer science, matrixes are represented by 2D arrays with dimensions $m \times n$, where $m$ is the number of rows, and $n$ is the number of columns. Each element in the matrix can be accessed using the array indexes. The first index represents the row, and the second index represents the column. For example, $matrix[i][j]$ is an element from the $i^{th}$ row and the $j^{th}$ column of the matrix.