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Jeff
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Loop on loading files

Asked by Jeff
on 2 May 2013

Hi!

I have a folder containing subfolders containing hdf5 files (10,000 of them in fact).

A example of a path would be 'data\A\F\G\TRATTGW128F427A82D.h5'.

Below 'data', there are 3 levels of folders, all named by a single letter. The final files all have similar names to TRATTGW128F427A82D.h5.

I have a function that converts hdf5 files to .mat. I want to upload all these files and store some of their info in a matrix.

Example:

hdf5_to_matfile('path\to\hdf5.h5','path\to\outputk.mat');
matk=load('path\to\outputk.mat');
A(k,1)=matk.data1;
A(k,2)=matk.data2;

How can I loop over all my folders and subfolder to obtain this one single matrix A containing one line for each folder with data1 and data2 in each column? And what would be the fastest way to proceed?

Thank you for your help!

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2 Answers

Answer by Jeff
on 2 May 2013

Thank you! This link really helped. However I have one last problem. I can get all the .h5 in one single directory, however I want my program to go through all the lower directories as well. The beginning of my code is:

myFolder = 'D:\Documents\Subset\A\A\A\';
if ~isdir(myFolder)
  errorMessage = sprintf('Error: The following folder does not exist:\n%s', myFolder);
  uiwait(warndlg(errorMessage));
  return;
end
filePattern = fullfile(myFolder, '*.h5');

but I also want the files that are in 'D:\Documents\Subset\A\A\B\*.h5', 'D:\Documents\Subset\A\B\F\*.h5' or 'D:\Documents\Subset\B\G\D\*.h5' for example. In my case, there are 1352 combinations in total. I tried doing:

myFolder = 'D:\Documents\MillionSongSubset\';
if ~isdir(myFolder)
  errorMessage = sprintf('Error: The following folder does not exist:\n%s', myFolder);
  uiwait(warndlg(errorMessage));
  return;
end
filePattern = fullfile(myFolder, '*\*\*\*.h5');

but it did not work... Is there another trick I need to know here?

  2 Comments

Jeff
on 2 May 2013

In fact, I want to know how I can go through all the subdirectories of 'D:\Documents\Subset\' recursively.

You posted code for this somewhere along the line. Or you can look in the File Exchange for rdir or another rdir


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