How to make a big tridiagonal matrix with matrices?
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How can I make a matrix H from two smaller matrices
as shown in the attached image?
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/354656/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/354659/image.png)
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Accepted Answer
David Hill
on 1 Sep 2020
h=size(H0);
a=[H0,zeros(h);zeros(h),H0];
b=[zeros(h),H1;H1,zeros(h)];
H=blkdiag(a,a,a,a,a,a)+blkdiag(b,b,b,b,b,b)+blkdiag(zeros(h),b,b,b,b,b,zeros(h));
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