Load multiple matlab data files and convert them to text
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Hi!
I have multiple matlab data files with different names (with ECG data from multiple patients) and I want to load them all and convert them to text.
Also, the data is in structure form so I have to do the following for each file:
signal = load('FileName')
data = [signal.val];
writematrix(data,'FileName.txt','Delimiter',',');
How can I do it all at the same time? Thank you a lot in advance :)
0 件のコメント
採用された回答
Image Analyst
2021 年 7 月 4 日
Code samples for processing a sequence of files are given in the FAQ:
6 件のコメント
Image Analyst
2021 年 7 月 4 日
編集済み: Image Analyst
2021 年 7 月 4 日
@Ana Gabriela Guedes, try this:
myFolder = pwd; %'C:\Myfoldersdirectory';
filePattern = fullfile(myFolder, 'EKG*.mat');
theFiles = dir(filePattern);
for k = 1 : length(theFiles)
baseFileName = theFiles(k).name;
fullFileName = fullfile(theFiles(k).folder, baseFileName);
fprintf('Now reading input file : "%s".\n', fullFileName);
% Now do whatever you want with this file name,
% such as reading it in as an image array with imread()
storedStructure = load(fullFileName);
% See if it has a val field stored in the .mat file.
if ~isfield(storedStructure, 'val')
% Show what fieldnames there are:
fieldnames(storedStructure)
errorMessage = sprintf('Error: no field called "val" in file\n"%s".\n\nSkipping this file.', baseFileName);
uiwait(errordlg(errorMessage));
continue; % Skip to bottom of for loop and continue iterations.
end
data = -storedStructure.val;
fprintf('Now plotting %d values of data.\n', length(data));
plot(data, '-', 'LineWidth', 2);
hold on
% Create the output file name.
[~, baseFileNameNoExt, etc] = fileparts(baseFileName);
fullOutputFileName = fullfile(myFolder, [baseFileNameNoExt, '.txt']);
fprintf('Now writing output file : "%s".\n', fullOutputFileName);
writematrix(data, fullOutputFileName, 'Delimiter', ',');
end
I added some improvments and robustness checks, like printing out informational messages, adding comments, using descriptive variable names, plotting the data, and checking to see if the data is actually in the mat file to begin with. It never hurts to be extra robust.
その他の回答 (1 件)
Sulaymon Eshkabilov
2021 年 7 月 4 日
If you are talking about series of files (e.g: P1.txt, P2.txt, ...) to load and convert their contents, then this might be an option:
for ii = 1:numel(Files)
FName = strcat('P', num2str(ii), '.txt');
signal = load(FName)
data = [signal.val];
writematrix(data,'FileName.txt','Delimiter',',', 'WriteMode','append');
end
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