extracting data around local minima?

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MacKenzie 2013-11-18

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https://ww2.mathworks.cn/matlabcentral/answers/106542-extracting-data-around-local-minima

编辑： MacKenzie 2013-11-18

hello,

First, let me give basic framework for the problem: I have data sets that reflect the trajectory of a joystick movement(X,y coordinates in a matrix). The subject needs to move the joystick from neutral past a distance to receive a reward.

I want to extract each pull. One complication is once they reach the target, they stay for a brief moment to collect the reward, just the numbers bounce slightly, giving me many local minima.

I was hoping to have code that reads through the matrix, finds the point where it hits a minimum, stays (perhaps means the noise at the target location), and puts the "pull" into a new matrix or array, etc. There is no consistent number of points between pulls.

I know how to weed out the neutral location data, it's the finding local minima and extracting that is giving me trouble.

Update: I have the local minima. Now, just to get the points in-between each local minima!

thanks!

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MacKenzie 2013-11-18

yes, good pt; I do have the direction vector, so perhaps using findpeaks on that is a good way to start - let me try and get back to you! thanks for the advice!

MacKenzie 2013-11-18