Average multiple vectors with different lengths

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Harm Gilsing 2020-5-25

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https://ww2.mathworks.cn/matlabcentral/answers/533078-average-multiple-vectors-with-different-lengths

评论： Rik 2020-5-25

I performed 3 measurements with different lengths of time. I would like to average those measurements without losing data. The measurements are stored in separate excel files which I can load each iteration of a for loop.

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Answer 1

Rik 2020-5-25

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https://ww2.mathworks.cn/matlabcentral/answers/533078-average-multiple-vectors-with-different-lengths#answer_438238

Pad the shorter vectors with NaN and use the 'omitnan' flag in mean.

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Harm Gilsing 2020-5-25

Hi Rik, can you give a short example of this?

Rik 2020-5-25

在 MATLAB Online 中打开

Sure:

A=[1 2 5];
B=[4 3];
C=[4 3 2 1 5];
alldata={A,B,C};%put them all in a cell for convenience
maxlen=max(cellfun('prodofsize',alldata));
for n=1:numel(alldata)
    current_elem=numel(alldata{n});
    if current_elem<maxlen
        alldata{n}((current_elem+1):maxlen)=NaN;
    end
end
%show the result of this loop
clc
[A,B,C]=deal(alldata{:})
mean([A;B;C],'omitnan')
%or better:
extradim=1+ndims(alldata{1});
bigarray=cat(extradim,alldata{:});
mean(bigarray,extradim,'omitnan')