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getfield to get values from an entire struct array?

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I have an array of objects of type Peak. Given the name of a field (I will be using several in turn), I would like to get the value of that field for every object in the array, resulting in a vector of double. Is there any way to ask getfield to do that, without resorting to a for loop? Or is there some related function that would do the job for me?

Accepted Answer

Bruno Luong
Bruno Luong on 29 Mar 2024
Create 1 x 3 struct array with field named 'afield'
s = struct('afield', {11 12 13})
s = 1x3 struct array with fields:
afield
s(1)
ans = struct with fields:
afield: 11
s(2)
ans = struct with fields:
afield: 12
s(3)
ans = struct with fields:
afield: 13
% Here is the command that might be usefule for you
A = cat(2, s.afield)
A = 1x3
11 12 13
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  3 Comments
Bruno Luong
Bruno Luong on 29 Mar 2024
Edited: Bruno Luong on 29 Mar 2024
Take a look at dynamic fieldname
s = struct('afield', {11 12 13});
fieldname = "afield"
fieldname = "afield"
A = cat(2, s.(fieldname))
A = 1×3
11 12 13
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Ken
Ken on 30 Mar 2024
Well I'll be! That is some WEIRD syntax! But it fits my need perfectly. Thank you!

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