Adding dissimilar structures together (not overwriting similar field values)

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Amy 2017-2-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/326189-adding-dissimilar-structures-together-not-overwriting-similar-field-values

编辑： Jan 2017-2-27

采纳的回答： Jan

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Hello!

I have a series of simulation results that I want to put together into 1 structure.

S=load('results1.mat')
S(2)=load('results2.mat')
and so on.

This works well, except for when the fieldnames are not completely the same.

Lets say that results1.mat contains 280 field names, results2.mat contains 283 field names, and that 279 fieldnames are completely the same.

I would like to have all the fieldnames in my structure S. If the separate results-file didn't contain the fieldname, I want the fieldvalue to be empty. And unlike examples elsewhere on the internet, in my case I do not want to overwrite fields, rather I want to have columns with fieldvalues for each simulation run.

How can I do this in an automated way?

Thank you very much in advance!

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Amy 2017-2-22

编辑：Amy 2017-2-22

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I think I solved my problem:

function A=merge_dissimilar_struct(A,B)
a=fieldnames(A);
b=fieldnames(B);
      if ~isequal(a,b);
          %Adding struct B to struct A, dissimilar fieldnames.
          %Create a cell of fieldnames that do not occur in A, but do occur in B.
          %Add fieldnames b of struct B (empty) to struct A.
          for xx=1:length(b)
              if ~isfield(A,char(b(xx)))
                  A().(char(b(xx)))=[];
              end
          end
          %Add fieldnames a of struct A (empty) to struct B.
          for xx=1:length(a)
              if ~isfield(B,char(a(xx)))
                  B().(char(a(xx)))=[];
              end
          end
      end
      B=orderfields(B,A);
      n=size(A,2);
      A(n+1)=B;
  end

Jan 2017-2-22

Note: a{xx} is smarter than char(a(xx)).

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Answer 1

Jan 2017-2-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/326189-adding-dissimilar-structures-together-not-overwriting-similar-field-values#answer_255865

编辑：Jan 2017-2-27

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Or simpler:

function A = AppendStruct(A, B)
fB = fieldnames(B);
nA = numel(A) + 1;
for ifB = 1:numel(fB)
  field = fB{ifB};   % [EDITED, typo, () -> {}]
  A(nA).(field) = B.(field);
end

Now the existing fields are reused and new fields are created automatically.

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Amy 2017-2-24

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With your code I get an error:

C.A=ones(2,2);
C.B=ones(15,2);
D.A=zeros(2,5);
D.B=zeros(15,5);
EE=AppendStruct(C,D);

Argument to dynamic structure reference must evaluate to a valid field name.

Error in AppendStruct (line 6) A(nA).(field) = B.(field);

Jan 2017-2-27

@Amy: This was a typo. See [EDITED].

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Answer 2

Guillaume 2017-2-24

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https://ww2.mathworks.cn/matlabcentral/answers/326189-adding-dissimilar-structures-together-not-overwriting-similar-field-values#answer_256173

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Another variant of the function:

function A = merge_dissimilar_struct(A,B)
   for fld = setdiff(fieldnames(A), fieldnames(B))'
      A(end).(fld{1}) = [];   %add mising fields to A
   end
   for fld = setdiff(fieldnames(B), fieldnames(A))'
      B(end).(fld[1}) = [];   %add mising fields to B
   end
   A = [A, B];
end