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How can I animate a parabolic function?

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Ezz El-din Abdullah
回答： Star Strider 2016-7-5
%Here is my code to plot -x^2 slowly like the comet function:
x = linspace(0,4*pi,100);
for a = linspace(-10,10,200)
y = -(x+a).^2;
plot(x,y,'o')
drawnow;
pause(1/40);
end
So how can I edit it to look like the comet function smoothly?

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Star Strider
Star Strider 2016-7-5
Plotting it in real time will probably not result in the smoothness you want.
I would experiment with im2frame and movie.

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