# How can I concatenate or merge two structures?

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MathWorks Support Team on 27 Jun 2009
I would like to merge two structures into a new structure containing all the fields of the two original structures. How can I do this in MATLAB?

### Accepted Answer

MathWorks Support Team on 28 Mar 2023
Edited: MathWorks Support Team on 30 Mar 2023
There is no direct ability in MATLAB that can be used to concatenate structures.
The attached file "mergeStructs.m" shows a number of methods that can be used to merge structures in MATLAB.
There are also online submissions on the MATLAB Central User Community that you can use. One such submission is:
Note that MathWorks does not guarantee or warrant the use or content of these submissions. Any questions, issues, or complaints should be directed to the contributing author.
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Royi Avital on 23 May 2020
Is there a way which is MATLAB Codeer friendly?

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### More Answers (3)

Ba Mo on 12 Nov 2019
This works IF AND ONLY IF there are no common fields (duplicate fields) in the 2 structures.
mergestructs = @(x,y) cell2struct([struct2cell(x);struct2cell(y)],[fieldnames(x);fieldnames(y)]);
I don't see why nobody pointed this out. it's intuitive!
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KAE on 16 Feb 2023
How do I execute this if I have two structures named Struct1 and Struct2?

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James on 23 Aug 2016
You can do this manually:
f = fieldnames(structA);
for i = 1:length(f)
structB.(f{i}) = structA.(f{i})
end
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John Beaumont on 12 Sep 2017
Convert structures to tables, then merge tables, then convert resulting table back to a structure.
% Create 1st structure
aa_s.val1 = 1;
aa_s.val2 = 2;
% Create 2nd structure
bb_s.val3 = 3;
bb_s.val4 = 4;
% Convert structures to tables
aa_t = struct2table( aa_s );
bb_t = struct2table( bb_s );
% Concatonate tables
merge_t = [ aa_t ,bb_t ];
% Convert table to structure
merge_s = table2struct( merge_t )
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