OK, i get it now, checking the doc gives me the following answer : sage: M=matrix([(1, -3, -1),(0, 1, 1),(-1, 2, 1)]) sage: R.<X> = QQ[] sage: P=X^2 sage: P.subs(M) [ 2 -8 -5] [-1 3 2] [-2 7 4] sage:
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