How to convert nested structure to contain its original data?

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Aisya Amelia 2021-4-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/801791-how-to-convert-nested-structure-to-contain-its-original-data

评论： Jan 2021-4-15

I'm new, and I need some help. So I have these multiple signals in double, .mat format and I managed to load them all as output using this simple code. And I want to further analyze this dataset.

But the output sets the values as struct, which doesn't allow me to conduct batch processing such as feature extraction on it, or import it in the Diagnostic Toolbox.

I want the data in the cell array to be as double, not struct. May I know how to solve this? Or it is bc there's something with my data?

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Aisya Amelia 2021-4-14

编辑：Aisya Amelia 2021-4-15

thank you! but i'm still very much confused. if i do the load and all computations in the same loop, is there a way to output the variables of of each .mat file as it is or cell? im sorry if my words are confusing. lets say each participant, there is 16 signals. as example, this is dataset for participant 1 before i pre-process which i had downloaded online. i'm confused on how they were able to store it as such.

for this cell above, the matlab generated code are: i had removed some columns where there were redundant data.

function importfile1(fileToRead1)
%IMPORTFILE1(FILETOREAD1)
%  Imports data from the specified file
%  FILETOREAD1:  file to read
%  Auto-generated by MATLAB on 15-Apr-2021 08:48:22
% Import the file
newData1 = load('-mat', fileToRead1);
% Create new variables in the base workspace from those fields.
vars = fieldnames(newData1);
for i = 1:length(vars)
    assignin('base', vars{i}, newData1.(vars{i}));
end

to pre-process it, i had to extract out each signal individually. example for signal 1, i used:

P1 = GSR_DATA(1,1) and then i used the signal analyzer toolbox to perform pre-processing. and i exported every signal into a new .mat file and saved in a new folder. now, i would like to combine all these exported signals into one dataset as previously. i attempted to load all the dataset as shown earlier and it came out as struct.

my code:

myFolder1 = ('C:\Users\User\Documents\Signals');
 
 
mysignals=dir('**/*.mat');
N = length(mysignals);
mydata=cell(N,1);
 
for k = 1:N
    mydata{k}=load(mysignals(k).name);
end

thank you!

Jan 2021-4-15

"in another set of array/table" - please do not let the reader decide, if you want a table or array. This is your decision.

Aisya Amelia 2021-4-15

编辑：Aisya Amelia 2021-4-15

Hello @Stephan ! I did try after you suggested it, but it ended up loading all .mat files as separate variables in the workspace: when i opened mydata, it was just empty, [ ] . If I do not assign the result of load to a variable, how do I load them as one output? thank you!

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采纳的回答

Jan 2021-4-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/801791-how-to-convert-nested-structure-to-contain-its-original-data#answer_675891

myFolder1 = ('C:\Users\User\Documents\Signals');
mysignals = dir(fullfile(myFolder1, '**', '*.mat'));
N = numel(mysignals);
mydata = cell(N,1);
for k = 1:N
    File = fullfile(mysignals(k).folder, mysignals(k).name);
    Data = load(File);
    mydata{k} = Data.P2V1;  % Or P2V3 or what ever?
end

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Aisya Amelia 2021-4-15

编辑：Aisya Amelia 2021-4-15

Each .mat file is a signal of m x 1 cell array. The variable of each signal are of numeric values (conductance). I want to import these arrays of values.

Jan 2021-4-15

All we need to knwo for the solution is the name of the variable stored in the MAT file. Replace my "P2V1" by the name of this field. I've written "or what ever" in the hope, that you can adjust it accordingly.

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