Forming a block diagonal matrix of one certain matrix?
1 view (last 30 days)
Show older comments
I have a matrix A which is m*n. I want to create a block tridiagonal matrices of size n*m whose diagonals elements are the matrix A.
B=eye(3);
C=ones(2);
S=ones(2);
for i=1:numel(A)
A(i,i) =repmat(B,i,1)
A(i,i+1)=repmat(C,i,1)
A(i,i-1)=repmat(S,i,1)
end
can anyone help me to find the error
3 Comments
Adam Danz
on 13 Jan 2020
If that's the example of A, then A cannot be a matrix. Is it a cell array or is the example misleading?
Answers (1)
Matt J
on 13 Jan 2020
Edited: Matt J
on 13 Jan 2020
S=1*ones(2);
B=2*ones(2);
C=3*ones(2);
copies=4; %number of repetitions
L=flip( {S,B,C, zeros(size(B)) } );
idx=full(interpMatrix([1,2,3],2,copies,1))+1;
A=cell2mat(L(idx))
A =
2 2 3 3 0 0 0 0
2 2 3 3 0 0 0 0
1 1 2 2 3 3 0 0
1 1 2 2 3 3 0 0
0 0 1 1 2 2 3 3
0 0 1 1 2 2 3 3
0 0 0 0 1 1 2 2
0 0 0 0 1 1 2 2
0 Comments
See Also
Categories
Find more on Operating on Diagonal Matrices 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!