..  lufact!(A) -> LU

``lufact!`` is the same as :func:`lufact`, but saves space by overwriting the input ``A``, instead of creating a copy.  For sparse ``A`` the ``nzval`` field is not overwritten but the index fields, ``colptr`` and ``rowval`` are decremented in place, converting from 1-based indices to 0-based indices.


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