How to take the mean of each four adjacent position in a matrix?

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So I have this matrix variable that I attached here. Its 1536 by 2048, and I want to reduce it to 768 by 1024 by taking the mean of each four adjacent positions with the omitnan opition as well so I can take out the useless NaNs there. I hope someone can help. Thanks

Accepted Answer

Chuguang Pan
Chuguang Pan on 12 Jun 2022
A=randi(10,1536,2048); % test Matrix
M=zeros(768,1024); % result Matrix
for row=1:768
for col=1:1024

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