mean of each column of a cell array that contains cell arrays

I have a cell array A(2x82). Cell array A contains in each cell cell arrays of different row sizes but equal column sizes. To be specific the column sizes are always 1.

First I want to combine the two rows of A and then calculate the mean of each column of cell array A. As a result i would get a 1x82 matrix.

Any suggestion? Thanks in advance, Peter

[Walter Roberson]

You have a 2 x 82 cell array of column vectors. When you take the mean of each column, I would expect a 2 x 82 numeric result, not a 1 x 82 numeric result.

[Peter P]

You are right! I forgot to mention that I want to first combine the two rows of A and then calculate the mean. Any thoughts?

Answer 1

[Walter Roberson]

cellfun(@mean, A)     %provided you want a 2 x 82 numeric result.

[Walter Roberson]

sum(cellfun(@sum, A)) ./ sum(cellfun(@length, A))

Answer 2

[Jos (10584)]

Another approach, as all cells contain a column vector:

M = arrayfun(@(k) mean([A(k,1) ; A(k,2)]), 1:size(A,1))

[Walter Roberson]

M = arrayfun(@(k) mean([A{1,k} ; A{2,k}]), 1:size(A,2))

[Nandini Chatterjee]

what does the 2 in 1:size(A,2) mean?

[Walter Roberson]

size(A,2) is the size of the second dimension of the array A -- the number of columns. 1:size(A,2) is then a vector of numbers, 1, 2, 3, 4, ... until the number of columns of A

[Nandini Chatterjee]

Thank you!