Matrices

Matrices

A matrix is a set of numbers arranged in rows and columns so as to form a rectangular array. The numbers are called the elements, or entries, of the matrix.
If there are m rows and n columns, the matrix is said to be an m by n matrix, written m x n. A matrix with n rows and n columns is called a square matrix of order n. An ordinary number can be regarded as a 1 x 1 matrix.
Two matrices A and B are equal to one another if they possess the same number of rows and the same number of columns, and their corresponding entries are the same. [RA] {EB}