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INTRODUCTION OF MATRIX

**MATRIX –**

**When some group of numbers are arranged in a rectangular form,
and its form of horizontal & vertical lines and these are enclosed by
brackets [ ] or parenthesis ( ), is called a matrix. The horizontal lines in a matrix are called
its rows, and the vertical lines in it are called its columns.**

**The numbers
constituting a matrix are called its elements or entries. The plural of matrix is called matrices.**

**Order of a
Matrix –**

**A matrix
having m rows and n columns is called an (m X n) [should read as m by n]
matrix or a matrix of order m by n.**

**Clearly, an (m X n)
matrix has mn elements. **

**We denote
matrices by capital letters. An element of a matrix appearing in i-th row and
j-th column is called the (I, j)th element of the matrix.**

**Example.1)**

**This above
matrix has 3 rows and 6 columns. So, its order is (3 X 6) [3 by 6]**

**Number of
elements in A = (3 X 6) = 18 (Ans.)**

**Example.2)**

**This above matrix has 5 rows and 3 columns.
So, its order is (5 X 3) [3 by 6]**

**Number of
elements in A = (5 X 3) = 15
(Ans.)**

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