Average the 3rd dimension in a matrix

I have a 360x181x360.

I want to average the 3rd dimension with 4, so I get a new matrix like 360x181x90.

How can I do that?

Answer 1

[Bruno Luong]

Mean every 4 indices of the third dimension

A=rand(360,181,360);
[m,n,p] = size(A);
m = mean(permute(reshape(A,m,n,4,[]),[1 2 4 3]),4)

[Jonas Damsbo]

Thanks! It's working!