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

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Gian Marco Ricci
Gian Marco Ricci 2024-10-1
评论： Matt J 2024-10-1
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

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Stephen23
Stephen23 2024-10-1
移动：Cris LaPierre 2024-10-1
Ran in:
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

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