MATLAB: Grouping elements in an array

Question

Hello. I have a 1 x 46 struct array 'data' with two fields, 'Altitude' and 'Velocity'. Each array has different sizes but the corresponding two arrays for the two fields have same sizes. For example, when I type in:

counts = array(@(x) numel(x.Altitude), data)
counts =
Columns 1 through 19
   100   335   104    74   294   101     0    ... until the column goes 46.

What I am trying to do is to group the elements of each arrays in 'Altitude' seven by seven and find the mean.Then, find the mean of the corresponding the elements in the 'Velocity' field. Then I would like to compare the each mean of the 'Altitude' arrays, and plot it.

Could anyone help me with this? Any help is greatly appreciated as I am clueless here. Thank you. The code I have written so far is:

for n = 1 : length(data)
   interval_number = floor(length(data(n).Altitude)/7);
   t = 0;
   for k = 1 : interval_number
       s1(n).a(k) = mean(data(n).Altitude(1+t:7+t));
       s1(n).b(k) = mean((data(n).Velocity(1+t:7+t)));
       t = t + 7;
   end
end

Answer 1

x = struct2cell(data);
out = cellfun(@(y)nanmean(reshape([y,nan(1,mod(-numel(y,7))],7,...
                                            [])),squeeze(x),'un',0);