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Evaluate[{x[t], v[t]} /.
   {x'[t] == v[t],
    v'[t] == μ (1 - x[t]^2) v[t] - x[t] + A*Cos[ω*t],
    x[0] == xv0[[1]],
    v[0] == xv0[[2]]},
   {x[t], v[t]},
   {t, 0, tt}]],
{t, 0, tt},
ImageSize -> {450, 450}, PlotRange -> 4, 
AxesLabel -> {TraditionalForm[x[t]], TraditionalForm[v[t]]},
PlotStyle -> PointSize[.5]],
{{μ, 0.75, "parameter μ"}, 0, 3, 0.01, 
Appearance -> "Labeled"},
{{ω, 0.75, "parameter ω"}, 0, 3, 0.01, 
Appearance -> "Labeled"},
{{A, 0.75, "parameter A"}, 0, 3, 0.01, Appearance -> "Labeled"},
{{xv0, {1, 1}}, {-4, -4}, {4, 4}, Locator}], {tt, 0, 200}, 
AnimationRate -> 3, AnimationRepetitions -> 3, 
AnimationRunning -> True]
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Not to answer your question (which you yourself should be able to work out with the online help of Export etc.), but I moved from GIF to MOV which works nicely as described here: The quicktime movies have true color and integrate nicely into Powerpoint. –  Yves Klett Jun 18 '13 at 14:32
Yves Klett The thing is, is that I have been working on this for awhile but the only thing it produces is a picture. Nothing moves. –  Slightly Jun 18 '13 at 14:35
Second argument of Export should be list of pictures. It is written in help. –  Kuba Jun 18 '13 at 14:46
Nothing is working. I don't know what I'm doing wrong! –  Slightly Jun 18 '13 at 14:56
This seems not a duplicate but there is an answer: –  Kuba Jun 18 '13 at 15:46

5 Answers 5

up vote 10 down vote accepted

You have to set values which are dynamic in Manipulate.

μ = .75; ω = .75; A = .075; xv0 = {1, 1};

Table pictures for different tt:

sol = Quiet@NDSolve[{x'[t] == v[t], v'[t] == μ (1 - x[t]^2) v[t] - x[t] + A*Cos[ω*t], 
                     x[0] == xv0[[1]], v[0] == xv0[[2]]
                    }, {x[t], v[t]}, {t, 0, 20}];

dat = Table[
            ParametricPlot[Evaluate[{x[t], v[t]} /. sol, {t, 0, tt}, 
                           PlotRange -> 4, AxesLabel -> {x[t], v[t]}]
            , {tt, .1, 20, .2}];

Create gif.

Export["gif.gif", dat]

enter image description here

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Can you include a slider by this method too where you can decide the speed of the animation? So other format needed too then. Any possibilities with Mathematica? –  Masi Dec 29 '14 at 21:29
@Masi You can add DisplayDurations option: –  Kuba Dec 29 '14 at 21:30
But I want the user to decide real-time the speed of animation. So I think gif is not a choice. –  Masi Dec 29 '14 at 21:34
@Masi you can save Manipulate/Animate as CDF. If not then it does not matter if you use gif or other movie extension, you need a player able to specify frames per second. (I hope I get your question) –  Kuba Dec 29 '14 at 21:49
Do You mean that you can have this kind of speed bar in the animation in Gif too? –  Masi Dec 29 '14 at 22:09

You can adjust the step size by changing the increment in the Table and you can adjust the animation rate using "DisplayDurations", e.g. for the Table above.

Export["dat.gif",dat, "DisplayDurations"->Table[t,{Length[dat]}]] 

where t is display duration in seconds (frame rate: 1/t). Other options for exporting are in the GIF documentation

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You can capture the frames as you manually manipulate like this:

 frames = {}
 Animate[Manipulate[(AppendTo[frames, ParametricPlot[ ... ] ])[[-1]] .. ]  ]

disable dynamic updating when done, then


enter image description here

warning this will quickly generate a large number of frames..

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I came across this very helpful video when perusing Wolfram's documentation:

How to Import and Export animations video by WRI

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I did not take a deep look at your code,but since you are using animate command,I suppose that your code is producing an animation which you can export it as movie into your powerpoint slides.


which produces an .avi movie in your document folder.

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