How to add and save struct in multiple .matfile for loop ?

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farhah muhammad 2023-6-20

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https://ww2.mathworks.cn/matlabcentral/answers/1985514-how-to-add-and-save-struct-in-multiple-matfile-for-loop

编辑： Walter Roberson 2023-6-20

HI, I have one folder name studygroup and a list of 26 .mat file in that folder. Each mat file contains 55 structure. I would like to add one struct (Struct.status = 'yes') for each .matfile using for loop, Is it possible?

directory{1,1} = 'studygroup'
files = dir(sprintf('%s/*.mat',directory{1,1})); % list all the .mat files. (26 .matfile )
for i=1:length(files) 
    load(sprintf('%s/%s',directory{1,1}, files(i).name)); 
    Struct.status = 'yes';
    save ('files', 'Struct')
end

what is the best way to add and save struct in multiple matfile ?

thank you

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farhah muhammad 2023-6-20

my mat files :

'FT03419.mat'

'FT07273.mat'

'FT10398.mat'

'FT17798.mat'

'FT18192.mat'

'FT19529.mat'

'FT29060.mat'

'FT34961.mat'

'FT34988.mat'

'FT36328.mat'

'FT38748.mat'

'FT41119.mat'

'FT51999.mat'

'FT58661.mat'

'FT64654.mat'

'FT73960.mat'

'FT77332.mat'

'FT77509.mat'

'FT78810.mat'

'FT80227.mat'

'FT81069.mat'

'FT81859.mat'

'FT83843.mat'

'FT94664.mat'

'FT97585.mat'

'FT99193.mat'

farhah muhammad 2023-6-20

when I try my code, Struct.status= 'aki' do not loop for all mat file.

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Answer 1

Shishir Reddy 2023-6-20

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Hi Farhah,

As per my understanding you want to add and save a new structure to multiple .mat files in the "studygroup" folder.

Alter your code as follows to accomplish the same.

directory = 'studygroup';
files = dir(fullfile(directory, '*.mat')); % list all the .mat files
for i = 1:length(files)
    matFilePath = fullfile(directory, files(i).name);
    load(matFilePath); % Load the .mat file
    
    % Add the new structure
    newStruct.status = 'yes';
    
    % Save the updated .mat file
    save(matFilePath, 'newStruct', '-append');
end

This code loops over each .mat file in the "studygroup" folder, loads the file, adds a new structure newStruct with the status 'yes', and saves the updated .mat file with the -append flag to preserve the existing data.

Make sure that the .mat files in the "studygroup" folder have the appropriate permissions for modification.

I hope this resolves the issue.