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
* B' }! D. W  `- N, P1 ~( z  S6 {Clear[tt]
& Y7 H8 G$ `& W* x* q& t% r
tt = {1, 1/2^2, 1/3^2}
, B& ^! e: S9 b0 p
. n/ E8 n+ S2 h- A! c; z- N{1,1/4,1/9}
% S; o" q9 l4 [8 h
/ W! n1 G* f: x) z  }% \  v! U7 E: z# SDo[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];
8 f. d& I" b1 [- [( ?! l/ qtt = {1, 1/2^2, 1/3^2};
/ s! f- ~% H& `# {/ HDo[tt = Append[tt, N[1/i^2]];
, j. |2 W5 _% ^# ^/ w) z! B2 _( x Print[ListPlot[tt, PlotRange -> {0, 1},
   PlotStyle -> PointSize[0.02]]], {i, 4, 20}]