Filtering the data according to the time stamp

Question

ASMS Mat Su 2011-11-20

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/21745-filtering-the-data-according-to-the-time-stamp

I would like to filter this data according to the time stamp i.e for the first three second of the time, and take average of Elevation and Speed at 0, 1, 2 and 3 sec.

OR take average for the first three second each time, and return one mean value for each parameters.

What is the appropriate function?

Anyone expert on this?

Let say matrix of A =

Time, s  Elevation  Speed
23.9  0.28
23.9  0.28
23.9  0.28
23.9  0.28
23.9  0.28
23.9  0.28
24.7  0.28
24.7  0.28
24.7  0.28
24.7  0.28
24.7  0.28
24.7  0.28
24.7  0.44
24.7  0.44
23.1  0.44
23.1  0.44
23.1  0.44
23.1  0.44
23.1  0.44
23.1  0.44

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Answer 1

Kostas 2011-11-20

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https://ww2.mathworks.cn/matlabcentral/answers/21745-filtering-the-data-according-to-the-time-stamp#answer_28658

在 MATLAB Online 中打开

Sure not the most "efficient" solution but could work smt like that

k=0;
for i=0:3 % loop over the seconds
   id=find(A(:,1)==i); %get indices where you find the time you want
   if ~isempty(id)
       k=k+1;
       elev_mean=mean(A(id,2)); %mean value of parameter elevation
       s_mean=mean(A(id,3)); %mean value of parameter time
       m_values(k,:)=[i elev_mean s_mean];
  end
end