MATLAB: How to assign results to varying filename

file namevariable

Hi all,

I am trying this:

for i = 1:length(originalData)
['data_hz' '_' num2str(i)] = selectedData(x1:x2);
end

I want to split my original data into different file names, but the code does not allow me to use this structure on the left side of the "=". Any hint please?

Thank you very much 🙂

Best Answer

Maybe you want some thing like this:

someFolder = 'D:\whatever';
for k = 1 : length(originalData)
  baseFileName = sprintf('data_hz_%d.dat', k);
  fullFileName = fullfile(someFolder, baseFileName);
  save(fullFileName, 'selectedData');
end

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MATLAB: How to load files identified by the matlab function of “dir”

See the second code example in the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

A smiple modification gives you the answer:

myFolder = 'C:\users\leon\documents'; % or whatever.
if ~isdir(myFolder)
  errorMessage = sprintf('Error: The following folder does not exist:\n%s', myFolder);
  uiwait(warndlg(errorMessage));
  return;
end
filePattern = fullfile(myFolder, '*.mat');
matFiles = dir(filePattern);
for k = 1:length(matFiles)
  baseFileName = matFiles(k).name;
  fullFileName = fullfile(myFolder, baseFileName);
  fprintf(1, 'Now reading %s\n', fullFileName);
  storedStructure = load(fullFileName);
  % Now do whatever you need to do with the structure you recalled.
end

MATLAB: Mixing string name and number,is the commmand correct?

I'd recommend you follow the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F because your method is not very robust. I prefer sprintf(). If you're not going to use, or can't use, dir() to get a listing of what files are there, then at least you should use exist() so you don't throw an exception that aborts your loop when the file is not found. That is what people do when they write robust code.

for k = 1 : 100  % Use k, not i (the imaginary variable)
    baseFileName = sprintf('filename%d', k);
    % Prepend the folder where the files live.  
    % If it's the current folder, then you can use folder = pwd.
    fullFileName = fullfile(folder, baseFileName);
    if exist(fullFileName, 'file')
        % If the file exists, delete it.
        delete(fullFileName);
    end
end

but again, see the FAQ for better code examples than that.

Best Answer

Related Solutions

MATLAB: How to load files identified by the matlab function of “dir”

MATLAB: Mixing string name and number,is the commmand correct?

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