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Graph plotting problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg120770] Graph plotting problem
  • From: "DaleJenk" <dale.jenkins8 at deletegooglemail.com>
  • Date: Tue, 9 Aug 2011 07:21:39 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com

I'm trying to get a graph of displacement versus time but only the axes 
appear. Thanks for any help.

Animate[m = 1.0;
 b1 = .1;
 b2 = .1;
 b3 = .1;
 soln = {x1, x2, x3} =
   c = b1*Cos[t]*{1, 0, -1} +
     b2*Cos[Sqrt[(2 + Sqrt[2])]*t]*{1, -Sqrt[2], 1} +
     b3*Cos[Sqrt[(2 - Sqrt[2])]*t]*{1, Sqrt[2], 1};
 balls = Graphics[{Black,
    Line[{{0, 0}, {1, x1}, {2, x2}, {3, x3}, {4, 0}}],
    Red, {Disk[{1, x1}, .1 Sqrt[m]], Disk[{2, x2}, .1 Sqrt[m]],
     Disk[{3, x3}, .1 Sqrt[m]]}}, PlotRange -> {{0, 4}, {-1, 1}},
   Frame -> True, ImageSize -> {400, 250}], {t, 0, 2 Pi}]
disp = Plot[
  Evaluate[{x1[t], x2[t], x3[t]}, {t, 0, 2 Pi},
   ImageSize -> {200, 150},
   AxesLabel -> {Row[{"time ", Style["t", Italic]}], "displacement"},
   ImagePadding -> {{35, 35}, {10, 20}}], AspectRatio -> Automatic] 





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