MATLAB: How to convert a .mat file into a .csv file

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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);
>> >> >>

Best Answer

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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