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How to use comet to trace the path of an object?

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reema shrestha
reema shrestha 2017-7-8
评论： Image Analyst 2017-7-9
I am writing a code for the simulation of double pendulum and i need to trace the path of the bob. But I am having trouble with it. This is a part of my code. Basically,i am having trouble in this portion. Though I use the command comet,it doesn't trace the path. Anyone who could point out my mistake and help me solve the problem? Here x1(i),y1(i) is the poition of first bob.
for i = 1 : max(arraysize)
plotarrayy = [pendulumtopy y1(i)]; % Plots solution at each time interval
plotarrayx = [pendulumtopx x1(i)];
plotarray2x = [x1(i) x2(i)];
plotarray2y = [y1(i) y2(i)];
plot(x1(i),y1(i),'ro',x2(i),y2(i),'bo','markersize',5,'markerfacecolor','r')
hold on
comet(y1(i));

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回答（1 个）

jonatan
jonatan 2017-7-8
comet requires the input(s) to be a vector and not a single value, as you wrote. In order to use this function, you should run it after the for loop:
comet(x1,y1)
  2 个评论
reema shrestha
reema shrestha 2017-7-9
What should be the input for the comet outside the loop? I tried using
comet(y(i))
But then i only runs inside loop,isn't it??
Image Analyst
Image Analyst 2017-7-9
Outside the loop, it should be what he said it should be:
comet(x1,y1)
Why did you change it?

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