Averaging the data from a 3d matrix and populating it in a 2D matrix.

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Arup Bhattacharya 2019-10-17

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https://ww2.mathworks.cn/matlabcentral/answers/485804-averaging-the-data-from-a-3d-matrix-and-populating-it-in-a-2d-matrix

评论： Arup Bhattacharya 2019-10-17

I have a problem. I have a 3D matrix, lets say A(15,8,40) and I want to get a new matrix, lets say B(15,8) where every row in matrix B will have the mean value of that row, averaged over the third dimension, in this case 40. How can I do that?

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Arup Bhattacharya 2019-10-17

I also want to calculate the stanard errors.

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Answer 1

Andrei Bobrov 2019-10-17

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B = mean(A,3);

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Arup Bhattacharya 2019-10-17

Thank you for the answer.

I have a Matrix named June21_Once_StillMat - the size of which is 15 x 41 x 40. I am trying to get the data from the colums 2 to 8 of the matrix une21_Once_StillMat to a new matrix A of size 15 x 8 x 40.

for j=1:15;
for k=1:8;
for i=1:40;
A(j,k,i)=June21_Once_StillMat(j,k+1,i);
end
end
end

I need to average the values of each row over i (40) from matrix A and populate that data to a new 3D matrix B of size 8 x 8 x 15. The third column of matrix B, B(k,3,j) will have the value obtained from the averaged value and the 4th column of matrix B, B(k,4,j) will be the standard error. I am not being able to figure this out.

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