Looking to animate two lines with the angle between them changing?

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Ronan 2014-11-25

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编辑： Andrew Reibold 2014-11-25

Have an EMG signal which I've used to get a range of corresponding angles. would like to have 2 lines representing an arm where the angle I have is between them. From there i would like to animate the whole process with all angles. Cannot figure out how to do this?

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回答（2 个）

Brandon 2014-11-25

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Are you wanting to animate this in real time or create a video file from the plot.

You may be interested in looking at these two functions:

getframe

writevideo

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Ronan 2014-11-25

create a video file from the plot. I cant seem to plot the lines with the associated angle?

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Andrew Reibold 2014-11-25

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编辑：Andrew Reibold 2014-11-25

在 MATLAB Online 中打开

Bro, If you are working with EMG signals you should really know how to do Highschool trig... haha :-)

But anyway, here is an example of how you could do it using Unit Circle concepts and a line of length 1! Replace angles with your angles in degrees - This one animates from 30-90. (If your angles are in Radians use sin and cos instead of sind and cosd )

figure
for angles= [30:90];
   x = cosd(angles);
   y = sind(angles);
   plot([0,1],[0,0],[0,x],[0,y])
   axis([-1.5 1.5 -1.5 1.5])
   pause(.01)
end

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Andrew Reibold 2014-11-25

编辑：Andrew Reibold 2014-11-25

I think I am misunderstanding what you mean by raised. I am sorry.

On my plot, it already looks like the arm is being 'raised' [from the horizontal - to Vertical]...

Ronan 2014-11-25

no it was to do with the level of contraction which would result in a larger EMG which would then result in a smaller angle between the upper and lower arm as you are applying more force.

Ye it does take a long time all right. will have to take a sample value every so often in the entire vector to make it run a bit quicker.

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