sage: M = MatrixSpace(RationalField(),2,3) sage: A = M([1,2,3, 4,5,6]) sage: A [1 2 3] [4 5 6] sage: A.parent() Full MatrixSpace of 2 by 3 dense matrices over Rational Field sage: A[0,2] = 389 sage: A [ 1 2 389] [ 4 5 6] sage: A.echelon_form() [ 1 0 -1933/3] [ 0 1 1550/3]
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