mean first 10 lines and next 10 line till finish array

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Siti Safwana Abd Razak 2021-12-6

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评论： Mathieu NOE 2021-12-7

i got 210338x3 table array. how to calculate mean for 10 line, then next 10 line, then next 10 line till finish my table array. i dont know how to group first 10th, next 10 and next 10.

thanks!

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Answer 1

Mathieu NOE 2021-12-6

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hello

try this

%% dummy data
data = rand(210338,3); % data must be column oriented (number of rows = number of samples)
buffer = 10;    % nb of samples for averaging 
%% zero overlap averaging (unweighted)
[m,n] = size(data);
for ci=1:fix(m/buffer)
    start_index = 1+(ci-1)*buffer;
    stop_index = min(start_index+ buffer-1,m);
    avg_data(ci,:) =mean(data(start_index:stop_index,:));  % size : 1 x 3 
end

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Siti Safwana Abd Razak 2021-12-7

hi Mathieu,

thanks!

Mathieu NOE 2021-12-7

My pleasure !

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Answer 2

Chunru 2021-12-6

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https://ww2.mathworks.cn/matlabcentral/answers/1604075-mean-first-10-lines-and-next-10-line-till-finish-array#answer_848580

在 MATLAB Online 中打开

a = rand(210338, 3);
nrows = size(a, 1)
nrows = 210338
n = 10;
nseg = floor(nrows/n)
nseg = 21033
c = squeeze(mean(reshape(a(1:n*nseg,:), n, nseg, 3)));
clast = mean(a((n*nseg+1):end,:));         % last part
whos
  Name            Size              Bytes  Class     Attributes

  a          210338x3             5048112  double              
  c           21033x3              504792  double              
  clast           1x3                  24  double              
  n               1x1                   8  double              
  nrows           1x1                   8  double              
  nseg            1x1                   8  double              