MATLAB: How to obtain each each maximum value from each signal set

max signal

Hi all

Because I am doing a special flow cytometry and I got 8 sets of wave, which means 1 set of wave is 1 cell pass through my sensor.

Now, I want to know how to pick up the maximum amplitude from each sets of wave?

Plus, are there any method to prevent double pick if one set of wave have same max value?

Thanks!

Best Answer

You have the Signal Processing Toolbox, so use the findpeaks function to get the peak amplitudes. It has a number of options so you can be certain to get only the values you want. If you want to get the amplitudes of the ‘valleys’ use findpeaks on the negative value of the signal vector.

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MATLAB: How to set threshold to trigger for start and stop finding max value

Can you post a diagram, plot, image, data or anything to help illustrate your situation?

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

Otherwise, just try find:

indexEnters = find(y > threshold, 1, 'first'); % Index when particle enters and signa becomes big enough.
indexLeaves = find(y > threshold, 1, 'last'); % Index when particle leaves and signa becomes small again.

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First, use the fft function to do a Fourier transform to see what the signal frequency components are.

After that, it should be straightforward to design a highpass filter to eliminate both the D-C offset and baseline drift, so the result will be close to what you want.

Best Answer

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