How to compute mean value of a field in a struct?

Hi everyone, writing here since I can’t find the solution to a problem I’m encountering. I need to compute the mean of some fields in a struct I created (see the file attached), but I can’t directly access this fields. It is a 1x31 struct. Each cell of the struct contains 3 fields (Azimuth, Colatitude, W) which are struct arrays. I’d need to compute the mean value of some of these fields cells since I need only 1 value for each cell but some contain more than one. For example, I wanted to compute mean(features{1}.azimuth(7)) but it says that the dot indexing is not supported for the struct. Hope you can help me, I know it is quite a complex structure! You’ll find the .mat attached

Answer 1

[Stephen23]

Rather than nesting lots of separate structures in a cell array, why not just use one structure array?:

C = load('featuresnew.mat').merged_features

C = 33x1 cell array
    {1x31 struct}
    {1x31 struct}
    {1x31 struct}
    {1x31 struct}
    {1x31 struct}
    {1x31 struct}
    {1x31 struct}
    {1x31 struct}
    {1x31 struct}
    {1x31 struct}
    {1x31 struct}
    {1x31 struct}
    {1x31 struct}
    {1x31 struct}
    {1x31 struct}
    {1x31 struct}

S = vertcat(C{:}) % one structure array

S = 33x31 struct array with fields:
    azimuth
    colatitude
    W

Simpler data design allow simpler (and therefore generally more reliable and more efficient) code:

M = S;
for k = 1:numel(S)
    M(k) = structfun(@mean,S(k),'uni',0);
end
M(1,7)

ans = struct with fields:
       azimuth: 80.1430
    colatitude: 60.8945
             W: 0.0663

[Gian Marco Ricci]

thank you! very very smart and useful <3

[Matt J]

@Gian Marco Ricci If so, you should Accept-click the answer.