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Alternative : the apply_map method :
sage: M=matrix([u/13 for u in range(9)], ncols=3) ; M
[ 0 1/13 2/13]
[3/13 4/13 5/13]
[6/13 7/13 8/13]
sage: M.apply_map(lambda u:round(u,2))
[ 0.0 0.08 0.15]
[0.23 0.31 0.38]
[0.46 0.54 0.62]
HTH,
