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Bode Plot slow under Manipulate

  • To: undisclosed-recipients:;
  • Subject: [mg128532] Bode Plot slow under Manipulate
  • From: kiwibooga at googlemail.com
  • Date: Thu, 1 Nov 2012 03:18:28 -0400 (EDT)
  • Approved: Steven M. Christensen <steve@smc.vnet.net>, Moderator
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • Delivered-to: l-mathgroup@wolfram.com
  • Delivered-to: mathgroup-newout@smc.vnet.net
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  • Newsgroups: comp.soft-sys.math.mathematica

I am using the BodePlot command within  Manipulate but find it slow and jerky compared to normal plot. For what it is doing it should be faster, or am I missing a trick?

V8 on Mac OS 10.6 MacBook Pro

Compare two methods of plotting a second order transfer function with variable damping - one using built in BodePlot and another using a LogLinearPlot

Gpp[\[Zeta]_] = \[Omega]^2/(s^2 + 
     2.0*\[Zeta]*\[Omega]*s + \[Omega]^2);

\[Omega] = 10000.0;

Manipulate[
 BodePlot[Gpp[\[Zeta]] /. {s -> s*2 \[Pi]}, {10, 10^6}, 
  ImageSize -> 300, GridLines -> Automatic, 
  GridLinesStyle -> Red], {{\[Zeta], 0.5, "damping ratio"}, 0, 1, 
  Appearance -> "Labeled"}];

MyBodePlot[tf_] := 
  Manipulate[
   Column[{LogLinearPlot[
      20*Log10[Abs[tf[\[Zeta]] /. s -> 2.0*\[Pi]*I*f]], {f, 10, 10^6},
       ImageSize -> 300, GridLines -> Automatic, 
      GridLinesStyle -> Red], 
     LogLinearPlot[
      180*Arg[tf[\[Zeta]] /. s -> 2.0*\[Pi]*I*f]/\[Pi], {f, 10, 10^6},
       ImageSize -> 300, GridLines -> Automatic, 
      GridLinesStyle -> Red]}], {{\[Zeta], 0.5, "damping ratio"}, 0, 
    1, Appearance -> "Labeled"}];

MyBodePlot[Gpp]



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