Average of the Vector elements in the matrix

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I have a matrix of 815*440 and I need to take the average of every 20 elements in all the rows and find the output as 815*22
Any help is appreciated
Thanks
  3 个评论
Kirby Fears
Kirby Fears 2015-9-16
编辑:Kirby Fears 2015-9-16
The answer I posted below solves that problem. Please give it a try.

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Kirby Fears
Kirby Fears 2015-9-16
编辑:Kirby Fears 2015-9-16
Below is a loop to take the mean of the first 20 columns, then the next 20 columns, etc. Let me know if this is not the computation you were trying to perform.
% Creating dummy matrix for example solution
a=reshape(1:815*440,815,440);
% Width of column groupings
colgroup=20;
% Initialize mean results array
results=NaN(size(a,1),size(a,2)/colgroup);
% Take means in loop
for iter=1:size(results,2),
startcol=colgroup*(iter-1)+1;
results(:,iter)=mean(a(:,startcol:startcol+colgroup-1),2);
end,

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James Tursa
James Tursa 2015-9-16
编辑:James Tursa 2015-9-16
Assuming you are averaging every 20 elements, not a sliding window:
A = your 815 x 440 matrix
m = mean(reshape(A',20,[]));
Anew = reshape(m,22,[])';

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