For loop doesnt terminate-kindly help

Hi, I have written a code to apply a random crop for a set of three images stored in a folder '1' at D: drive and store it in a separate folder named 'chrom-randcrop1' in the same drive. The code is as follows:

myFolder = 'D:\1';

% Check to make sure that folder actually exists. Warn user if it doesn't.

if ~isdir(myFolder)

errorMessage = sprintf('Error: The following folder does not exist:\n%s', myFolder);

uiwait(warndlg(errorMessage));

return;

end

% Get a list of all files in the folder with the desired file name pattern.

filePattern = fullfile(myFolder, '*.bmp');

theFiles = dir(filePattern);

mkdir('D:\chrom-randcrop1')

% image processing-random cropping of a 100*100 image from the input image

for k = 1 : length(theFiles)

baseFileName = theFiles(k).name;

fullFileName = fullfile(myFolder, baseFileName);

imageArray = imread(fullFileName);

imageArray5=random_square_grab(imageArray,100);

baseOutputFileName = sprintf('randcrop100_1(%d).bmp', k);

outputFolder = 'D:\chrom-randcrop1';

fullOutputFileName = fullfile(outputFolder, baseOutputFileName);

imwrite(imageArray5, fullOutputFileName)

end

dir D:\chrom-randcrop1

The issue is the loop doesn't terminate. The folder is created but then the loop remains busy. Kindly help me with the corrections in this code. Thanks.

[Star Strider]

What is the result of only running:

length_theFiles = length(theFiles)
return                                  % Stop The Script (Delete Later)

before the loop.

Answer 1

[Image Analyst]

Add this before the for loop

whos theFiles  % No semicolon!
numFiles = length(theFiles)  % No semicolon!
if numFiles == 0 || isempty(theFiles)
    warningMessage = 'No files found';
    uiwait(warndlg(warningMessage));
    return;
end
for k = 1 : numFiles

What do you see in the command window, and does the warning pop up a message box?

[shivasakthi]

Hi, The code perfectly works now. There was no warning messages while I used your code given above. I had a problem with one of the function definitions. I corrected it and got the results. Many thanks for your assistance.

Answer 2

[Jan]

 The issue is the loop doesn't terminate.

Strange. What does happen instead? Does Matlab convert millions of files? Or does the code of random_square_grab contain an infinite loop? Where does Matlab stop, when you hit Ctrl-C?