Overview
Let’s learn different matrix multiplication using the Octave or Matlab tool. In general, we will discuss two multiplications in this tutorial:
- Element-to-element
- Matrix-to-matrix
>> A = [1 2 3 ; 4 5 6 ; 7 8 9 ]; >> disp(A) 1 2 3 4 5 6 7 8 9 >> R = A.*A ; >> disp(R); 1 4 9 16 25 36 49 64 81 >> B = A*A ; >> disp(B); 30 36 42 66 81 96 102 126 150 >>
Element-to-element
We can use the times (.* ) operator for the multiplication. For example:
R = A.*A;
disp(R) ;
Alternatively,
R=times(A,A);
Matrix-to-Matrix
We can perform using the * operator.
C= A*A;
>> A = [1 2 3 ; 4 5 6 ; 7 8 9 ];
>> C= A*A;
>> disp(A);
1 2 3
4 5 6
7 8 9
>> disp(C);
30 36 42
66 81 96
102 126 150
>>
Help and information about Octave is also available on the internet at https://www.octave.org