求助：为什么不能显示图形？

matlab666

想动画显示散列图，却没有显示
0 T7 g) J, E+ B& NClear[tt]
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tt = {1, 1/2^2, 1/3^2}

{1,1/4,1/9}

Do[ListPlot[tt = Append[tt, 1/i^2]], {i, 4, 20}]
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matlab666

自己动手，丰衣足食--问题已解决
Clear[tt];
tt = {1, 1/2^2, 1/3^2};
! y1 J5 B; r! I, T" i+ UDo[tt = Append[tt, N[1/i^2]];
Print[ListPlot[tt, PlotRange -> {0, 1},
   PlotStyle -> PointSize[0.02]]], {i, 4, 20}]