How to accumulate different structs, with same fields beneath one another

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Cameron Kirk 2021-6-4

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https://ww2.mathworks.cn/matlabcentral/answers/847965-how-to-accumulate-different-structs-with-same-fields-beneath-one-another

评论： Jonas 2021-6-7

I have a struct, which is similar format to the one below. I have 128 different people with the data in the same format, like the one below.

All I'm trying to do, is write a loop which will simply read in each participants struct (in the exact same format as below), and stack all of the results of the participants in one cotinuous vector for each specific field.

So eventually we would have one long field containing all of the field1 variables for all participants

One long field containing all of the field2 variables for all participants in the same struct...

All I can get at the moment, is the loop to replace the data existing in the struct, rather than add it underneath the previous participant's..

Please can someone help me?

Thanks

Cam

s = struct(field1,value1,field2,value2,field3,value3,field4,value4, field5,value5)
field1 = 'f1';  value1 = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i'};
field2 = 'f2';  value2 = {1,2,3,4,5,6,7,8,9};
field3 = 'f3';  value3 = {13,32,3.2,42,5,26,7,38,9};
field4 = 'f4';  value4 = {1,2,3,34,35,6,7,83,9};
field5 = 'f5';  value5 = {1,4,11,45,5,6,17,28,79};

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Answer 1

Jonas 2021-6-4

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https://ww2.mathworks.cn/matlabcentral/answers/847965-how-to-accumulate-different-structs-with-same-fields-beneath-one-another#answer_716760

编辑：Jonas 2021-6-4

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i am not sure how exactly your multiple structs are saved, but if you saved them in a multidimensional struct, you can get all fields of a specific entries e.g. like following:

myStruct(1).name='Teo';
myStruct(1).age=24; 
myStruct(2).name='Lea'; 
myStruct(2).age=35;
cellWithAllNames={myStruct.name};

if you did not save the structs in a m-dimensional struct you can just concatenate them like normal variables (e.g. [struct1; struct2]) and then call one field name for the overall struct like in the above code.

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Jonas 2021-6-6

编辑：Jonas 2021-6-6

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so if i see that correctly: you have multiple files (one for each participant) and each file is a 1x9 struct. each of the 9 structs has 5 fields, where the first field f1 is a character array and the other 4 fields are single numbers.

what exactly is your wanted output? you can for example generate a Nx9 struct if you have N participants. to achieve this you could generate a struct using

myStruct=Test1.data;

and expand it with the next struct using

myStruct(2,:)=Test2.data;

and so on.

if you want to keep one 1x9 struct but each field is a Nx1 array or character array you can accumulate the values in the fields similarly like

myStruct=Test1.data;
fields=fieldsnames(myStruct);
for nrOfFile=1:N
    for fieldNr=1:numel(fields)
        load(['participant' num2str(nrOfFile)];
        myStruct.(fields{fieldNr})=[myStruct.(fields{fieldNr}); ...
                                  Test.data.(fields{fieldNr})];
    end
end

if your m-d array corresponds to e.g. a trial number it may be nice to generate a table from your accumulated struct using struct2table()

Cameron Kirk 2021-6-7

Thanks mate, this is so helpful! I basically want to generate a single struct, which contains the data from all participants in each field. but this seems to have worked

Thanks again!

Cam

Jonas 2021-6-7