Matlab tool to extract data from struct to seperate .mat files

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Henning Schmitz 2022-12-28

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评论： Henning Schmitz 2023-1-2

Hello together,

i want to build a tool (best case a GUI) where you can load in data (.mat struct files) and extract the different values to seperate .mat files which then can be saved as new .mat files.

I don't know the names of the variables in the struct.

Would be very nice to get some help from you guys, thanks!

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Henning Schmitz 2023-1-2

在 MATLAB Online 中打开

rec1_002.mat

Hey Rahul, thank you very much!

With the GUI you should be able to do the following steps.

Load in .mat files from your PC
A text field where the name of the selected file is shown
A checkbox with the name "Convert all"
A dropdown menu, where you can select the variables in the struct of the .mat file
A convert button which automatically saves the selected variables (all or the selected one from the dropdown menu) as new .mat files with their corresponding variable name as the new .mat file name

Something like this:

I already got the functions 1 and 2 implemented but i am a bit stuck in the converting of the file so a bit of help would be pretty nice.

function load_data_button_Callback(hObject, eventdata, handles)
% get filename
[file,path] = uigetfile('*.mat');
file_path = fullfile(path,file);
handles.data_name = file;
handles.full_file = file_path;
set(handles.data_name_edittext, 'String', handles.data_name);
guidata(hObject,handles)
function data_name_edittext_Callback(hObject, eventdata, handles)
% Show data name
handles.metricdata.data_name_edittext = data_name;
guidata(hObject,handles)

I will attach a .mat file which is comparable to the ones which i will have to convert. So the task would be to get new .mat files X and Info which are containing the informations from rec1_002.X and rec1_002.Info.

Stephen23 2023-1-2

在 MATLAB Online 中打开

rec1_002.mat

As Jan wrote, LOAD the MAT-file and loops over its content using FIELDNAMES():

S = load('rec1_002.mat')
S = struct with fields:
    Info: [1×1 struct]
       X: [1×1 struct]
A = struct2cell(S);
B = fieldnames(S);
for k = 1:numel(A)
    T = cell2struct(A(k),B(k));
    F = sprintf('%s.mat',B{k});
    save(F,'-struct','T')
end

Checking:

dir *.mat
Info.mat      X.mat         rec1_002.mat  

You can modify this to select only the MAT file that the user wants, etc.

Henning Schmitz 2023-1-2

Thank you that helps a lot!

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