Computing the mean over 3 numbers in a matrix

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mohamad shirgholami
评论： Image Analyst 2021-6-6
I have a matrix with dimensions of 5000*51. I want to find the average over each 3 numbers and finally I have a matrix of 5000 * 17.
  1 个评论
Image Analyst
Image Analyst 2021-6-6
Do you want a moving mean where the window of 3 moves over one row, or one column, each time, or do you want the window to move in jumps of 3? Do you want 3 in the same row to be averaged? Or do you want the 3 to be in the same column? Which way do you want the mean to go????

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采纳的回答

KSSV
KSSV 2021-6-6
Let A be your matrix.
[m,n] = size(A) ;
B = reshape(A,m,3,[]) ;
C = mean(B,2) ;
iwant = reshape(C,m,[]) ;

更多回答（1 个）

Chunru
Chunru 2021-6-6
A = rand(5000, 51); % your data
A1 = reshape(A, [5000 3 17]); % reshape the 51 element by 3x17 array
meanA = mean(A, 2); % Mean along 2nd dimension

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