Is there something like ?
sage: A = matrix(QQ,3,3,[3,-1,1,3,6,2,3,3,7])
sage: A.diagonal()
[3,6,7]
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Is there something like ?
sage: A = matrix(QQ,3,3,[3,-1,1,3,6,2,3,3,7])
sage: A.diagonal()
[3,6,7]
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