Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2006
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2006

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: NDolve + ParametricPlot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg67529] Re: NDolve + ParametricPlot
  • From: "Scout" <Scout at nodomain.com>
  • Date: Fri, 30 Jun 2006 04:13:49 -0400 (EDT)
  • References: <e7vkhi$sjo$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

"Paolo Pani" <paolopani at RIMUOVEREgmail.com>
 news:e7vkhi$sjo$1 at smc.vnet.net...
> Hi, i'm new with Mathematica..i'm getting mad with expressions like this:
>
> sol = NDSolve[{x''[t] == x[t], x[0] == 1, x'[0] == 1.1}, x, {t, 0, 3}];
> Plot[x[t] /. sol, {t, 0, 3}];
> Plot[D[x[t]] /. sol, {t, 0, 3}];
> ParametricPlot[Evaluate[{x[t] /. sol, D[x[t] /. sol]}], {t, 0, 3}];
>
> The first two Plots are ok, the third give me:
>
>
>
> ParametricPlot::pptr: {InterpolatingFunction[{{0., 3.}}, {2, 2, True,
> Real, \
> {3}, {0}}, {{\[LeftSkeleton]1\[RightSkeleton]}}, {{0, 3, 6, 9, 12, 15, 18, 
> \
> 21, 24, 27, \[LeftSkeleton]32\[RightSkeleton]}, {1., 1.1, 
> \[LeftSkeleton]8\
> \[RightSkeleton], \[LeftSkeleton]113\[RightSkeleton]}}, {Automatic}][t]}
> does \
> not evaluate to a pair of real numbers at t = 1.25`*^-7.
>
>
>
>
> ... and "More..." does tell nothing more.
>
> Where is my mistake?
>
> Thanks and sorry for my bad english
>
> Paolo
>

Try with:

    ParametricPlot[{x[t] , x'[t]} /. sol, {t, 0, 3}];


Regards,
    ~Scout~ 


  • Prev by Date: calling maximize recursively
  • Next by Date: Re: NDolve + ParametricPlot
  • Previous by thread: Re: NDolve + ParametricPlot
  • Next by thread: Re: NDolve + ParametricPlot