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How to save indexes from a MATLAB figure in a matrix manually?

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Hello everyone,
I have an ECG signal that I should find its R-peaks by an R-peak detection algorithm.
At the first, I want to acquire the peaks' indexes by clicking on the point and then saving all the indexes in a matrix. Is it possible to guide me on how to select the points manually and save their indexes?
After creating the matrix, I want to compare the algorithm results to the manual results.

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Mario Malic
Mario Malic el 14 de Jun. de 2021
Here's an extensive answer by Adam that should cover everything you might need with the datatips (if you are able to create those on your figure). Otherwise see the CurrentPoint property. Sorry, I can't provide an example for this.

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