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Eigen
3.2.92
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means the first coefficient packet is guaranteed to be aligned. An expression cannot has the AlignedBit without the PacketAccessBit flag. In other words, this means we are allow to perform an aligned packet access to the first element regardless of the expression kind:
*this
Use Map<SparseMatrix<> >
*this
and the given hyperplane use SimplicialLDLT or class SimplicialLLT