How to convert a .mat file into a .csv file?

Question

Srika 2016-4-6

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/277404-how-to-convert-a-mat-file-into-a-csv-file

评论： Ola Fekry 2022-2-19

I have a .mat file loaded in workspace. I want to convert it into .csv file.

FileData = load('Trainset.mat');
csvwrite('FileName.csv', FileData.M);

I used the above method to convert but i get this error. >> csv_Con Reference to non-existent field 'M'.

Error in csv_Con (line 2) csvwrite('FileName.csv', FileData.M);

>> >> >>

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Azzi Abdelmalek 2016-4-6

What is FileData.M? its size?

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Answer 1

Walter Roberson 2016-4-6

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https://ww2.mathworks.cn/matlabcentral/answers/277404-how-to-convert-a-mat-file-into-a-csv-file#answer_216657

在 MATLAB Online 中打开

FileData = load('Trainset.mat');
fields = fieldnames(FileData);
for K = 1 : length(fields)
  thisvar = fields{K};
  thisdata = FileData.(thisvar);
  if ~isnumeric(thisdata)
    warning('Skipping field %s which is type %s instead of numeric', thisvar, class(thisvar));
  else
    thisfile = sprintf('FileName_%s.csv', thisvar);
    csvwrite(thisfile, thisdata);
  end
end

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Ola Fekry 2022-2-19

Plz I have a RF signal dataset of 220000 .mat file how can I put them in CSV file to be used in classification learner app for evaluation?

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Answer 2

Azzi Abdelmalek 2016-4-6

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https://ww2.mathworks.cn/matlabcentral/answers/277404-how-to-convert-a-mat-file-into-a-csv-file#answer_216656

在 MATLAB Online 中打开

FileData = load('Trainset.mat');
v=reshape([FileData.M],size(FileData))
csvwrite('FileName.csv', v)

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Answer 3

MBD4FUN 2016-4-6

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https://ww2.mathworks.cn/matlabcentral/answers/277404-how-to-convert-a-mat-file-into-a-csv-file#answer_216658

在 MATLAB Online 中打开

Don't know if this is what you are looking for but here is one way of solving this problem.

FileData = load('Trainset.mat');
% get all varaible names
varNameList = fields(FileData);
% create a csv file to dump all data
fid = fopen('Trainset.csv','wt')
% write header if you prefer
fprintf(fid,'ColumnA,ColumnB');
for i = 1:length(varNameList)
   switch lower(FileData.(varNameList{1}).class)
       case 'char'
            % write data to CSV file
            fprintf(fid,'%s,%s\n');
       case 'double'
            % do whatever you want with the double
            % ...and write data to CSV file
            fprintf(fid,'%s,%s\n');
       % ...
   end
end
% close CSV file
fclose(fid);