Calculate the mean of multiple 3D arrays layer by layer

Question

AbioEngineer 2020-12-21

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https://ww2.mathworks.cn/matlabcentral/answers/699020-calculate-the-mean-of-multiple-3d-arrays-layer-by-layer

编辑： Ameer Hamza 2020-12-21

Code is provided below but is inefficient. Is there a more elegant way?

Let's say I have 2 3D arrays: matrix1 and matrix2 both of the same dimension e.g. 10x10x3

How could I calculate the element-average between layer1 of matrix1 and matrix2 and do that for all 3 layers so the final outcome is another 10x10x3 matrix avgMat where avgMat(:, :, 1) is the mean of matrix1(:, :, 1) and matrix2(:, :, 1)?

m1 = cat(3,matrix1(:,:,1),matrix2(:,:,1));
m1=mean(m1,3);
m2 = cat(3,matrix1(:,:,2),matrix2(:,:,2));
m2=mean(m2,3);
m3 = cat(3,matrix1(:,:,3),matrix2(:,:,3));
m3=mean(m3,3);
avgMat=cat(3,m1, m2, m3)

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Answer 1

Ameer Hamza 2020-12-21

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/699020-calculate-the-mean-of-multiple-3d-arrays-layer-by-layer#answer_580895

编辑：Ameer Hamza 2020-12-21

I am not sure why you are concerned about the layers. You are just taking an element-wise average of two matrices. Talking about layers is just making your problem more confusing. The following is equivalent to your code.

avgMat = (matrix1+matrix2)/2

Just in case you are intentionally looking for something confusing

avgMat2 = mean(cat(4, matrix1, matrix2), 4)