Dividing a big matrix into small matrices(or Multiply a portion of a matrix to another) to multiply it with a small matrix and after that re add them into the same position.
13 views (last 30 days)
Show older comments
I have a matrix A(400x400) and B(2x2). I want to divide matrix 'A' into 2x2 matrices and multply it with matrix B. Later on Recombine all the matrices from the output into the same locations from where I separated from A.
Example
A = 1 2 3 4 5 6 . . . . B = 1 2
6 5 4 3 2 1 . . . . 3 4
3 2 1 6 5 4 . . . .
5 4 6 1 2 3 . . . .
.
.
I simple want 1 2 ; 6 5 from A to be multiplied with B and restored in the same position and then multiply 3 4 ; 4 3 with B and so on. I am a beginner. Thank you very much
0 Comments
Accepted Answer
KSSV
on 8 Oct 2022
A = [1 2 3 4 5 6 ;
6 5 4 3 2 1 ;
3 2 1 6 5 4 ;
5 4 6 1 2 3] ;
B = [1 2 ; 3 4] ;
[m,n] = size(A);
k = [2 2];
C = mat2cell(A,k(1)*ones(m/k(1),1),k(2)*ones(n/k(2),1)) ;
[m,n] = size(C) ;
D = cell(m,n) ;
for i = 1:m
for j = 1:n
D{i,j} = C{i,j}*B ;
end
end
iwant = cell2mat(D)
More Answers (0)
See Also
Categories
Find more on Matrices and Arrays in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!