How to create a 3 diagonal matrix with blocks

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Johan De Jager
Johan De Jager 2022-6-26
评论： Voss 2022-6-27
I would like to create a matrix of the following form, ideally without having to use a loop as its size can become rather large:
basically it is an 2N x 2N matrix with a double wide 3 diagonal.
If anyone can provide some assistance in this it would be much appreciated.

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Voss
Voss 2022-6-26
编辑：Voss 2022-6-26
Ran in:
N = 7;
M = zeros(2*N,N+2);
M( 1+(2*N+2)*(0:N-1) + reshape([0 1]+[0;1;2]*2*N,[],1) ) = 1;
disp(M);
1 1 1 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 1 1 1

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