How can I concatenate or merge two structures?

Question

MathWorks Support Team 2009-6-27

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https://ww2.mathworks.cn/matlabcentral/answers/96973-how-can-i-concatenate-or-merge-two-structures

编辑： MathWorks Support Team 2023-3-30

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?

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Answer 1

MathWorks Support Team 2023-3-28

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https://ww2.mathworks.cn/matlabcentral/answers/96973-how-can-i-concatenate-or-merge-two-structures#answer_106323

编辑：MathWorks Support Team 2023-3-30

mergeStructs.m

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:

https://www.mathworks.com/matlabcentral/fileexchange/7842-catstruct

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 2020-5-23

Is there a way which is MATLAB Codeer friendly?

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Answer 2

Ba Mo 2019-11-12

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在 MATLAB Online 中打开

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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Adam Danz 2021-2-10

Nice one, Ba Mo.

(Answer edited to format the line of code)

KAE 2023-2-16

How do I execute this if I have two structures named Struct1 and Struct2?

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Answer 3

James 2016-8-23

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You can do this manually:

 f = fieldnames(structA);
 for i = 1:length(f)
    structB.(f{i}) = structA.(f{i})
 end

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Answer 4

John Beaumont 2017-9-12

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https://ww2.mathworks.cn/matlabcentral/answers/96973-how-can-i-concatenate-or-merge-two-structures#answer_281212

在 MATLAB Online 中打开

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 )