The vector should look something like,
[1 2 3 0 0 0 0 1 2 3 0 0 0 0 1 2 3 0 0 0 0 1 2 3]; I know the vector ([1 2 3]) that I wish to 'paste' along the diagonal but I do not know the size of the array so the number of rows would need to be determined by a variable N.
You can use spdiags to set the diagonals and have the desired shape:
n = 4; A = full(spdiags(ones(n,1)*[1,2,3],[0,1,2],n,n+2)); This returns:
A = 1 2 3 0 0 0 0 1 2 3 0 0 0 0 1 2 3 0 0 0 0 1 2 3 It's a bit crude, but possible to construct the desired matrix as toeplitz:
a = [1 2 3]; toeplitz([a(1); zeros(length(a),1)],[a(:); zeros(length(a),1)]) with answer:
ans = 1 2 3 0 0 0 0 1 2 3 0 0 0 0 1 2 3 0 0 0 0 1 2 3 You can also use 2D-convolution:
v = [1 2 3]; N = 4; result = conv2(v, eye(N)) 