How to detect rotation in a trajectory?

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Struggling in MATLAB 2022-4-30

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评论： Star Strider 2022-5-2

I have to write an algorithm to detect rotation in the trajectory. Basically, I have to detect the red zone in the trajectory. Currently I have the time and coordinate data.

How do I approach it?

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Riccardo Scorretti 2022-4-30

You are working in a 2D or 3D space?

Struggling in MATLAB 2022-5-1

2-D space.

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Star Strider 2022-5-1

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I would use the gradient function to calculate the numerical derivative.

For example:

dydx = gradient(y) ./ gradient(x);

Plot that as a function of ‘x’ as well, and it may provide some clues on how to define that region of the curve.

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Struggling in MATLAB 2022-5-2

Thanks for your input. I think this will work.

Star Strider 2022-5-2

As always, my pleasure!

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更多回答（1 个）

Sulaymon Eshkabilov 2022-5-1

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在 MATLAB Online 中打开

One way of detecting the region of values is using logical indexing, e.g.:

t = ...
x = ...
y = ...
    % Way 1
Ind = t>=0 &  t<=5;  % Select the region according to the time data
Xs = x(Ind);
Ys = y(Ind);
% Way 2
Ind = x>=0 &  x<=5;  % Select the region according to x data
Xs = x(Ind);
Ys = y(Ind);