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extract structure array value

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Murugan C
Murugan C on 24 Sep 2020
Commented: Murugan C on 1 Oct 2020
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.

  2 Comments

Stephen Cobeldick
Stephen Cobeldick on 24 Sep 2020
After fixing the mismatching fieldnames, you can use comma-separated lists like this:
>> tmp = [MyData.User];
>> out = [tmp.Id]
out =
5 7 8 9 75 45
Murugan C
Murugan C on 1 Oct 2020
It work fine... Thanks

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Accepted Answer

Rik
Rik on 24 Sep 2020
Edited: Rik on 24 Sep 2020
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]

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More Answers (2)

madhan ravi
madhan ravi on 24 Sep 2020
You need to use a loop.

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Fangjun Jiang
Fangjun Jiang on 24 Sep 2020
%% correct data first
MyData(6).User.Id= 45;
MyData(6).User.Name= 'XXX';
%% then
A=struct2array(MyData);
result=[A.Id];

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