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

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. :)

Answer 1

[Kaushik Lakshminarasimhan]

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).

[Inteeskimo]

Is there a way to plot one averaged cycle instead of all the cycles on top of each other, thanks.

[Kaushik Lakshminarasimhan]

Just take the mean before plotting:

plot((-round(0.2*fs):round(0.4*fs))/fs,mean(y_around_peak));

[Inteeskimo]

I'm getting an error :(

[Kaushik Lakshminarasimhan]

What is the error?

[Inteeskimo]

never mind, I managed to fix the error myself, thanks for the help!

[Neethu Varughese]

what does x stand for here?