How to move from file to file in a loop, MatLab?

Question

Is there a way to simply load the name of the first file in a directory without specifying its name, and then in each iteration move on to the next file in the directory?

I have the problem of the file names being named with 1, 1.5, 2,2.5,3, 3.5 endings etc... so num2str(X) in an iteration will not help to locate the file.

I am trying to rename them using strrep(s1,s2,s3), but yet again I run into the same problem of loading them into a loop!

I understand that I should have named them with more planning at first, but these files are much too large to run the simulations again.

This is what I have to rename the files:

%%%RENAMING A FILE%%%

%Search directory to get number of files
 d1=dir('\MATLAB\Data\NumberedQwQoRuns');
 numfiles = length(d1)-2;


for a=1:numfiles
%Search subdirectory if necessary for count of those folders
d2=dir('\MATLAB\Data\NumberedQwQoRuns\Run'num2str(a));
subdir = length(d2)-2;
for b= 1:subdir

origname= PROBLEM???

Newname=['Zdata' num2str(b) '.txt']
Newfile= strrep(origname, origname, newname)
movefile(origname,Newfile)

end
end

Thank You Very Much for your help, Abid A

Answer 1

Here is my solution:

%# get runs subdirectories
BASE_DIR = '/path/to/Runs';
runsDir = dir( fullfile(BASE_DIR,'Runs') );
runsDir = {runsDir([runsDir.isdir]).name};           %# keep only directory names
runsDir = runsDir( ~ismember(runsDir, {'.' '..'}) ); %# ignore "." and ".."

for r=1:numel(runsDir)
    %# get files in subdirectory
    runFiles = dir(fullfile(BASE_DIR,'Runs',runsDir{r},'*.txt')); %# *.txt files
    runFiles = {runFiles.name};                                   %# file names

    %# map filenames: 1,1.5,2,2.5,... into 1,2,3,4,...
    [~,ord] = sort(str2double( regexprep(runFiles,'\.txt$','') ));
    newrunFiles = cellstr( num2str(ord(:),'Zdata_%d.txt') );
    newrunFiles = strtrim(newrunFiles);

    %# rename files
    for f=1:numel(runFiles)
        fname = fullfile(BASE_DIR,'Runs',runsDir{r},runFiles{f});
        fnameNew = fullfile(BASE_DIR,'Runs',runsDir{r},newrunFiles{f});
        movefile(fname,fnameNew);
    end
end

I tested it on the following file structure:

Runs/
|
|__Run1/
|  |__1.txt        will become: Zdata_1.txt
|  |__1.5.txt                   Zdata_2.txt
|  |__2.txt                     Zdata_3.txt
|  |__2.5.txt                   etc...
|  |__3.txt
|  |__3.5.txt
|
|__Run2/
   |__1.txt
   |__1.5.txt
   |__2.txt
   |__2.5.txt
   |__3.txt
   |__3.5.txt