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

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Ronan on 25 Nov 2014
Edited: Andrew Reibold on 25 Nov 2014
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?

Brandon on 25 Nov 2014
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:
Ronan on 25 Nov 2014
create a video file from the plot. I cant seem to plot the lines with the associated angle?

Andrew Reibold on 25 Nov 2014
Edited: Andrew Reibold on 25 Nov 2014
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
Ronan on 25 Nov 2014
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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