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Re: Varying a constant in an ODE to Manipulate solution

  • To: mathgroup at smc.vnet.net
  • Subject: [mg126868] Re: Varying a constant in an ODE to Manipulate solution
  • From: Bob Hanlon <hanlonr357 at gmail.com>
  • Date: Thu, 14 Jun 2012 05:32:38 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <201206130857.EAA03730@smc.vnet.net>

sol[c_] := {x[t], y[t], z[t]} /. First[
   NDSolve[{y''[t] + Sin[y[t]/c] == 0,
     y'[0] == 0, y[0] == 1/(1 + c),
     x'[t] == t, x[0] == c^2,
     z'[t] == 2 c x[t] - y[t], z[0] == 2},
    {x, y, z}, {t, -3, 3}]]

Use a single Evaluate. For example,

Manipulate[
 Plot[Evaluate[{sol[c][[1]], sol[c][[2]]}], {t, -3, 3},
  PlotStyle -> {Green, Thick},
  ImageSize -> 200,
  AspectRatio -> Automatic,
  PlotRange -> {{-3, 3}, {-1.05, 8.05}}],
 {c, -0.5, 2, 0.2}]

Manipulate[
 Plot[Evaluate[Most[sol[c]]], {t, -3, 3},
  PlotStyle -> {Green, Thick},
  ImageSize -> 200,
  AspectRatio -> Automatic,
  PlotRange -> {{-3, 3}, {-1.05, 8.05}}],
 {c, -0.5, 2, 0.2}]

Manipulate[
 Plot[Evaluate[Rest[sol[c]]], {t, -3, 3},
  PlotStyle -> {Green, Thick},
  ImageSize -> 200,
  AspectRatio -> Automatic,
  PlotRange -> {{-3, 3}, {-10, 10}}],
 {c, -0.5, 2, 0.2}]

Manipulate[
 Plot[Evaluate[Drop[sol[c], {2}]], {t, -3, 3},
  PlotStyle -> {Green, Thick},
  ImageSize -> 200,
  AspectRatio -> Automatic,
  PlotRange -> {{-3, 3}, {-10, 10}}],
 {c, -0.5, 2, 0.2}]


Bob Hanlon


On Wed, Jun 13, 2012 at 4:57 AM, Narasimham <mathma18 at hotmail.com> wrote:
> Same topic is continued. Thanks to Murray Eisenberg and Bob Hanlon
>
> All variables or a single variable are easily pocked out from sol[c_]
> list for plotting.
> But how to pick out two out of them for ParametricPlot  ( 2D) ?
>
> sol[c_] := {x[t], y[t], z[t]} /.
>  First[NDSolve[{y''[t] + Sin[y[t]/c] == 0, y'[0] == 0,
>     y[0] == 1/(1 + c), x'[t] == t, x[0] == c^2,
>     z'[t] == 2 c x[t] - y[t], z[0] == 2}, {x, y, z}, {t, -3, =
3}]]
> Manipulate[
>  Plot[Evaluate[sol[c]], {t, -3, 3}, PlotStyle -> {Red, Thick},
>  AspectRatio -> Automatic,
>  PlotRange -> {{-3, 3}, {-10, 10}}], {c, -0.5, 2, 0.2}]
> Manipulate[
>  Plot[Evaluate[sol[c][[1]]], {t, -3, 3}, PlotStyle -> {Red, Thick},
>  AspectRatio -> Automatic,
>  PlotRange -> {{-3, 3}, {-10, 10}}], {c, -0.5, 2, 0.2}]
> " 2 parameter Dynamic manipulation not OK "
> Manipulate[
>  Plot[{Evaluate[sol[c][[1]]], Evaluate[sol[c][[1]]]}, {t, -3, 3},
>  PlotStyle -> {Green, Thick}, AspectRatio -> Automatic,
>  PlotRange -> {{-3, 3}, {-10, 10}}], {c, -0.5, 2, 0.2}]
>
> Regards
> Narasimham
>



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