How can I take an average of a signal in order to smooth the data?

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Inteeskimo 2017-11-11

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评论： Neethu Varughese 2018-1-6

First I need to divide each cycle up. each cycle needs to be divided as: 0.2 seconds before and 0.4 seconds after the highest y value. That way all the cycles will align.

I am quite new to matlab, so sorry I can't even attempt this. Thank you. :)

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Kaushik Lakshminarasimhan 2017-11-11

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在 MATLAB Online 中打开

Let t be the set of time points, y your signal, and fs be the sampling rate.

[~,peaks] = findpeaks(y,'MinPeakHeight',1); % select only the highest peaks
segments = arrayfun(@(x) x-round(0.2*fs):x+round(0.4*fs), peaks,'UniformOutput',false);
y_around_peak = cell2mat(cellfun(@(x) y(x), segments ,'UniformOutput',false)');
plot((-round(0.2*fs):round(0.4*fs))/fs,y_around_peak);

If you get an error in line 2, that probably means you don't have enough samples around either the first or the last peak - in that case, replace peaks in line 2 by peaks(2:end-1).