How to load files identified by the matlab function of "dir"?

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Leon 2013-12-8

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评论： sixwwwwww 2013-12-8

I have many files in a folder named "mat_files". What I want to do is to load the files and get their values. Below is my code:

a = dir('mat_files');
for i = 3:length(a);  
    filename = a(i).name;
    load strcat('mat_files/', filename);
end;

This is the error:

Error using load
Unable to read file 'filename': no such file or directory.

When I type a(3).name in the command window, I get the correct filename of "ex0219.mat". Of course, I can load the data by typing "load ex0219.mat". Clearly load a(3).name does not work. I also tried load (a(3).name), which does not work either.

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Leon 2013-12-8

编辑：Leon 2013-12-8

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Thank you so much for the tip. I missed the path of the files when using load. But why

load strcat('mat_files/', filename) ;

does not work either?

sixwwwwww 2013-12-8

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rewrite it like this:

load(strcat('mat_files/', filename));

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采纳的回答

Image Analyst 2013-12-8

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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

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Leon 2013-12-8

编辑：Leon 2013-12-8

Thank you for the code. Glad to learn the use of "fullfile". It works flawlessly!

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sixwwwwww 2013-12-8

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编辑：sixwwwwww 2013-12-8

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you should read files like this:

directoryString = 'YourDirectory';
files = dir(strcat(directoryString,'*.mat'));                                                   
names = {files.name}

I hope it helps. Good luck!