means the first coefficient packet is guaranteed to be aligned. An expression cannot have 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
*this
is column-major, then there must not exists any nonzero coefficient of coordinates i
x
col such that i
>= row. Otherwise the matrix is invalid. Use Map<SparseMatrix<> >
use SimplicialLDLT or class SimplicialLLT