A rectangular array of symbols (which could be real or complex numbers) along rows and columns is called a matrix.
Thus a system of m x n symbols arranged in a rectangular formation along m rows and n columns and bounded by the brackets [.] is called an m by n matrix (which is written as m x n matrix).
In a compact form the above matrix is represented by A = [aij], 1 ≤ i ≤ m, 1 ≤j ≤ n or simply [aij]m x n
The numbers a11, a12, … etc of this rectangular array are called the elements of the matrix. The element aij belongs to the ith row and jth column and is called the (i, j)th element of a matrix.
Two matrices are said to be equal if they have the same order and each element of one is equal to the corresponding element of the other.
CLASSIFICATION OF MATRICES
A matrix having a single row is called a row matrix. e. g. [1 3 5 7]
A matrix having a single column is called a column matrix. e.g.
An m x n matrix A is said to be a square matrix if m = n i.e. number of rows = number of columns.
⋄ The diagonal from left hand side upper corner to right hand side lower corner is known as leading diagonal or principal diagonal. In the above example square matrix containing the elements 1, 3, 5 is called the leading or principal diagonal.
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