Using kron to create a large matrix
조회 수: 3 (최근 30일)
이전 댓글 표시
I wrote this code to create a block tridiagonal matrix with I (I is the identity matrix) on the sub-diagoanls and A as the square matrix on the main diagonal.
How do I repeat this process so that I can have the 11 A's on the main diagonal and 10 I's on the subdiagonals. So eventually, i get a larger tridiagonal matrix.
A = [-4 2 0;1 -4 1;0 2 -4]; %main diagonal
B = [0 1 0; 0 0 1; 0 0 0]; %sub-diagonal
W = kron(eye(3),A) + kron(B,eye(3))+ kron(B',eye(3))
댓글 수: 2
Guillaume
2019년 4월 24일
I'm unclear on what result you want, in particular what the 11 B's refers to. As far as I can tell there's only one B.
채택된 답변
Andrei Bobrov
2019년 4월 24일
n = 11;
A = [-4 2 0;1 -4 1;0 2 -4]; %main diagonal
m = size(A,1);
mn = m*n;
o1 = ones(mn,1);
out = full(spdiags([o1,repmat(spdiags(A),n,1),o1],[-3,-1:1,3],mn,mn));
추가 답변 (0개)
참고 항목
카테고리
Help Center 및 File Exchange에서 Logical에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!