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by bee_rider 1345 days ago
Invert can also destroy structure you might want to keep around, for example the LU factorization of a banded matrix will still be banded (lapack will do partial pivoting which will increase the bandwidth, but with it'll only double the number of super-diagonals in L), while the inverse is a full matrix.
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Err, the number of super-diagonals in U obviously, haha, oops.