Now we will write formal definition of a matrix.
An arrangement of numbers into m-rows and n-columns is called a matrix of order .
A matrix always denoted by capital letters whereas their elements or entries are denoted by small letters
This form of matrix is called a matrix in tabular form. Matrices can also be written in short form or abbreviated form as:
The Order of a Matrix:
The number of rows and the number of columns in a matrix is called the order of the matrix, denoted by or , where number of rows, number of columns.