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MathGroup Archive 2002

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Re: Getting Coordinates from plot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg32966] Re: Getting Coordinates from plot
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Fri, 22 Feb 2002 01:48:48 -0500 (EST)
  • Organization: Universitaet Leipzig
  • References: <a5271k$27k$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

a) what is a "prettier" graphics package. For 2d plots Mathematica
has all the stuff to make perfect publication ready graphics ..

b) 
   Table[ {xd[t], xdd[t]}, {t,1000,1500,0.00001}]

   will generate a table of the computed data.

Regards
  Jens


Winston Garira wrote:
> 
> Hi,
> 
> Can someone help me on this one.
> I would like a list of coordinates so that I can analyze them further
> and possibly import into a "prettier" graphing package. What should
> I do when using the NDSolve function?
> 
> I have tried the menu command: Input -> Get Graphics Coordinates.
> This requires me to use Mod1 key which I don't have on my keyboard.
> 
> How can I get coordinates of the plot from the following:
> 
> Pends[init1_, init2_, time_, k_, {c_, w_, p_}] :=
>       Module[{},
>         pend = NDSolve[{
>           x1''[t] + c x1'[t] + ((1 + p Cos[w t])) Sin[x1[t]] == k (x2[t] - x1[t]),
>           x2''[t] + c x2'[t] + ((1 + p Cos[w t])) Sin[x2[t]] == k (x1[t] - x2[t]),
>               x1[0] == init1[[1]], x1'[0] == init1[[2]],
>               x2[0] == init2[[1]], x2'[0] == init2[[2]]},
>               {x1, x2}, {t, 0, time},
>               MaxSteps -> 200000];
>               xd[t_] := x1[t] /. pend[[1]];
>               xdd[t_] :=x1'[t] /.pend[[1]];
>               xr[t_] := x2[t] /. pend[[1]];
>               xrd[t_] :=x2'[t] /.pend[[1]];
>               ];
>    c = 0.1;  w = 2.0;  p = 2.0;
>    Pends[{1.37, 0}, {-1.17, 0}, 5000, 0.0, {c, w, p}];
>    ParametricPlot[{ {xd[t], xdd[t]}, {xr[t], xrd[t]}}, {t, 1000, 1500}];
> 
> 
> 
>  Winston


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