MATLAB: Extract structure array value

MATLABstructures

Hi all
I have nested structure like below,
MyData(1).User.Id = 5;
MyData(1).User.Name = 'XXX';
MyData(2).User.Id = 7;
MyData(2).User.Name = 'XXX';
MyData(3).User.Id = 8;
MyData(3).User.Name = 'XXX';
MyData(4).User.Id = 9;
MyData(4).User.Name = 'XXX';
MyData(5).User.Id = 75;
MyData(5).User.Name = 'XXX';
MyData(6).User.Name = 45;
MyData(6).User.data = 'XXX';
I need output out = [5,7,8,9,75,45]
without loop i need to output.
if any body know inbuild command for that.
Thanks in advance.

Best Answer

You can hide the loop with arrayfun, but be aware that a good loop is always better than cellfun or arrayfun. You should ask yourself why you want to avoid loops.
MyData(1).User.Id = 5;
MyData(1).User.Name = 'XXX';
MyData(2).User.Id = 7;
MyData(2).User.Name = 'XXX';
MyData(3).User.Id = 8;
MyData(3).User.Name = 'XXX';
MyData(4).User.Id = 9;
MyData(4).User.Name = 'XXX';
MyData(5).User.Id = 75;
MyData(5).User.Name = 'XXX';
MyData(6).User.Id= 45;%correcting assumed typo

MyData(6).User.Name= 'XXX';%correcting assumed typo
arrayfun(@(s) s.User.Id,MyData)
It is also possible to avoid arrayfun:
tmp=[MyData.User];[tmp.Id]
%R2020a and later:
[horzcat(MyData.User).Id]
Related Question