Apply function to all fields of a structure

Question

dandan 2018-2-6

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https://ww2.mathworks.cn/matlabcentral/answers/380951-apply-function-to-all-fields-of-a-structure

回答： Stuart McGarrity 2018-5-29

Say I have a structure with a bunch of fields, and I would like to add a subfield to each field with the mean of its values, such as:

structure(1).field1.mean = mean(structure(1).field1.values);

But I'd like to do this for all elements in the structure (i.e., structure(:)) and for many fields (i.e., structure.field1, structure.field2, structure.field3, etc.), sort of like a wildcard call.

The best I've come up with so far is a double for loop with dynamic field names:

fieldnames={'field1' 'field2' 'field3'};  
for i=1:length(structure)
  for j=1:length(fieldnames)
     structure(i).(fieldnames{j}).mean = mean(structure(i).(fieldnames{j}).values);
  end
end

But this seems sloppy... Is there a way to do this without for loops? Thanks!

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Answer 1

James Tursa 2018-2-6

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https://ww2.mathworks.cn/matlabcentral/answers/380951-apply-function-to-all-fields-of-a-structure#answer_303609

What you have is likely the best way to do this. Since there will need to be a loop of some sort to do this anyway (even if it is in the background of a function call), may as well just write it out like you have since it is easy to read and understand what is happening.