How do I iterating through a struct with several levels?
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I have a struct thats three levels deep and would like to iterate through the second level while keeping the last level a constant and save the data.
% This works but how do i iterate through d1,d and d3?
for i = 1 : 3
j.d(i) = data.d1(:,4)
end
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"I have a struct thats three levels deep"
Actually the uploaded data is a simple scalar structure, each field of which contains a numeric array:
S = load('data.mat');
data = S.data
Note that simpler data design would use indexing rather than forcing pseudo-indices into the fieldnames, e.g. by using a non-scalar structure or a cell array. Using indexing would make your code simpler than the current approach.
Note also that fields can change order.
采纳的回答
First, a point of clarification: the mat-file attached to the question contains a struct with three fields, each of which is an array, rather than a struct containing a struct containing another struct, which is what "a struct that's three levels deep" sounds like to me.
To iterate through the fields of a struct, you can use dynamic field names and the fieldnames function. For instance, to create a struct j that has the same fields as the struct data from the mat-file, but with only the 4th column from each, you can do this:
load data
display(data);
j = struct();
f = fieldnames(data);
for i = 1:numel(f)
j.(f{i}) = data.(f{i})(:,4);
end
display(j);
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