Showing posts with label Multiplying Matrices. Show all posts
Showing posts with label Multiplying Matrices. Show all posts

Tuesday, September 18, 2012

Multiplying 2x2 Matrices


Introduction to Multiplication of 2by 2 Matrix:

There are two types of multiplications is there.

Scalar multiplication
Matrix Multiplication
Scalar multiplication:

It is an ordinary multiplication.the regular numbers are called the scalar.

Matrix multiplication:

It is  the operation of multiplying  a matrix with another matris or multiplying matrix with scalar.

Ordinary matrix product:

It is mostly used to Multiplying Matrices. The multiplication is defined between two matrices If only the breadth of the first matrix is equals to the height of the next matrix that  means the second matrix.

If we multiplying   mx a matrix with  aXn matrix means the result  will be the  m x n matrix..

Properties of Matrix Multiplication:

Properties of matrix multiplication:

It is not  usually  commutative. that means  AB  BA.
If A and B are the two n x n matrices , then the determinant of its product  is independent for the      order of the matrices in their products.
If both the matrices are  diagonal matrices then their product is commutative.
The matrix multiplication is satisfies the  Associative property.
A(BC)=(AB)C
It is distributive over the addition:
A(B+C)=AB+AC
(A+B)C=AC+BC
It is compatible with the scalar multiplication.
It does not  satisfied the commutative property.

How to multiply matrices

Consider  two matrices A and B .

step 1:The first row first element of the matrix A is multiply by the First column First element of the matrix B.

step 2: And add to the  The first row second  element of the matrix A is multiply by the first column second element of the matrix B.

Step 3:The second row first element of the matrix A is multiply by the second column First element of the matrix B.

step 4: And add to the  second row second  element of the matrix A is multiply by the second  column  second element of the matrix B.

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Example for 2 X 2 Matrix Multiplication

Example for 2 x 2 matrix multiplication

Ex 1 :   `[[2,3],[1,3]]`     `xx``[[0,1],[2,1]]`

Sol :     Step 1:

(2  3 )`((0),(2))`

= (2 x 0)+(3 x2)

=6

Step 2:        (2  3)`((1),(1))`

=(2 `xx` 1)+ (3`xx`

=2+3

=5

Like wise we have to do the  remaining steps.

= `[[6,5],[6,4]]`