Moving Window for a specific Time

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Saad Alqahtani 2021-7-6

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评论： Saad Alqahtani 2021-7-6

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Hi,

So, the goal of this code is to calculate a Coefficient of Variation with time window of 5 seconds.

Here is my code.

% datanabs  is a tourque value in Newton Meter 
% t =(5*fsamp); moving window of 5 seconds
Mmean = movmean (datanabs,t); % mean of 5 seconds sliding window 
Mstd = movstd(datanabs,t); % std of 5 seconds sliding window 
CoV = (Mstd./Mmean)*100; % Here where I calcuulte the Coefficient of Variation

It's working but I think there is a better and efficint way to do it. Any help would be appreciated. Thanks in advance.

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dpb 2021-7-6

Well, if that is the definition of what you want for the moving window, don't know what would be more efficient although you don't need the two temporary arrays unless you need them for other reasons besides to compute the CV vector.

These use a N-point sliding window and return partial window values for ends so the length of the output is same as the length of the input. You can optionally discard the endpoints by selection of optional endpoints that will return shorter by the length of the window.

Or, you can choose to compute nonoverlapping windows and get fix(N/t) results instead; this can be done by reshape and direct application of mean,std and then back to vector.

Just all depends on what you want/need...

Saad Alqahtani 2021-7-6