How can I refer to all fields (of a particular level) within a structure?

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AR
AR on 5 Jul 2018
Commented: AR on 6 Jul 2018
Example: I have a struct such as this (simplified): Students.Gender.Height
I want to refer to and operate upon all fields regardless of gender. So, Students.Boy.6feet or Students.Girl.6feet would both be affected by the operation. Not a great example, but I hope I am conveying the need here. Is there a wildcard or () or {} type of way to index or refer to all fields of the "gender" level?

Accepted Answer

James Tursa
James Tursa on 5 Jul 2018
What "works" is probably going to depend on what is contained in the sub-fields and what you intend to do with this data downstream in your code. E.g., for your simplistic example if you wanted to extract the data (assuming the Height was scalar):
result = cellfun(@(x)Students.(x).Height,fieldnames(Students))
That would give you a result variable that you could use downstream.
Maybe you could give us more detail on the fields of your structure, and what operations you intend.
  2 Comments
AR
AR on 6 Jul 2018
Ok, here's what I was needing to do:
I used your method to get me the result variable, call it r.
I would like to pass the value in r (which is a cell array) to another similar structure. Let's call this RivalStudent.
So, in the end, RivalStudent.(x).Height = Student.(x).Height, the latter being r, of course. How do I assign RivalStudents of both genders the same heights as those of the Students? TIA.
In reality, these are not students and genders, but the original struct looks like this: A.B(1 of 5 fields).C(1 of 40 fields, each of which contains a cell array of numbers or strings).

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