How to get a sparse block matrix?

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MoonPie1
MoonPie1 2018-5-10
编辑： James Tursa 2018-5-10
I have four 3-cross-3 matrices which are sparse. How do i add those matrices to (i,i) (i,j) (j,j) (j,i) of the 3N-cross-3N sparse matrix?
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James Tursa
James Tursa 2018-5-10
编辑：James Tursa 2018-5-10
We need more details from you. Can you provide a short example showing exactly where the additions are supposed to go in the 3Nx3N matrix? Why can't you just directly add them in?

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