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12:31 I.5: RREF I.5: RREF	I.5: RREF linear algebra row column matrix columns ref times variables zeros pivot bottom numbers matlab linear nonzero solutions equations rows raf form outcomes From Tobin Driscoll 0 likes 111 plays 0
08:30 Section 2.6 Section 2.6	Section 2.6 julia matrix factorization row matrix factorization rows pivot column lu element permutation zeros a. vector algorithm times function copy identity matrices notation unit From Tobin Driscoll 0 likes 3 plays 0