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This doesn't generate the correct matrix. For starters, there are elements in all entries above the diagonal instead of just the ones in "the diagonal above the diagonal", and the diagonal elements are also wrong. For s=1, the diagonal should be A+i,...
It might be what I'm trying to do... I want to get matricies u that solve B[u]=0. I put your code into mine but it didn't work - may I see your code please?