Grouping data from grp2idx output

I have an nx3 cell array, where n>1000, containing file info from a directory and its subfolders.

exampleFileInfo = {'/path/to/subfolder', 'filename', 'ext'; '/path/to/subfolder', 'filename', 'ext'};

I would like to group this data so that groupData{i} returns a cell array of the files in the ith subfolder.

[ind, dirStr] = grp2idx returns a nx1 array of indecies where exampleFileInfo{i, 1} is in the directory represented by the value of ind{i}, and that directory path is returned by dirStr(ind(i)).

What is the best way to produce the groupData array where groupData{i} contains all the filenames in directory dirStr(ind(i)).

My current code works but uses a for loop, is there a better way of doing this?

currDir = uigetdir;
dirLst = rdir([currDir, '\**\*.ext']);
fileNames = strrep({dirLst.name}', currDir, '');

filePathInfo = cell(numel(fileNames), 3);
[filePathInfo(:, 1), filePathInfo(:, 2), filePathInfo(:, 3)] = cellfun(@(f) fileparts(f), fileNames, 'UniformOutput', false);

[groupID, groupString] = grp2idx(filePathInfo(:, 1));

fileInfo = cell(max(groupID), 1);

ids = min(groupID):max(groupID);

for i = min(groupID):max(groupID)
    indecies{i} = find(groupID==i); 
    groupFiles{i} = filePathInfo(indecies{i}, 2);
end

(rDir function from http://www.mathworks.co.uk/matlabcentral/fileexchange/32226)

Thanks,

Answer 1

[Sean de Wolski]

If what you have works, I would use it!

Just make sure to preallocate the cells befor ethe for-loop

groupFiles = cell(max(groupID),1);
indecies = groupFiles;
for ii = ...