Sparse Block Matrix Construction

2015 5 22
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I want to construct a matrix that looks like
X = [0, A,
B, 0]
Where the A and B blocks are, in themselves, sparse matrices. I already have code for generating the A and B blocks, and I was hoping to reuse that. Is there a way I can then create the X matrix so that it is also sparse?

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James Tursa
James Tursa 2015-5-22
编辑：James Tursa 2015-5-22

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[Am,An] = size(A);
[Bm,Bn] = size(B);
X = spalloc(Am+Bm,An+Bn,nnz(A)+nnz(B));
X(Am+1:Am+Bm,1:Bn) = B;
X(1:Am,Bn+1:An+Bn) = A;

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