Randomly selecting images from a directory

Hello,

I have a directory of 10000 JPEG files. I want to write a script that can randomly select 100 images from this directory and save these images to a new folder on my desktop. How do I do this?

Thank you!

Answer 1

[J. Alex Lee]

Use "dir" and "randperm"

[AK]

Thanks! how would use randperm to select the file the index corresponds to?

[Rik]

Have you read the documentation for randperm? What did you try? Also, what makes this different from you previous question?

[J. Alex Lee]

eagle eyes! yea, i have nothing really to add to what Jan answered in previous post.

[AK]

Thank you I was able to get it working!

Answer 2

[Image Analyst]

This is how I'd do it:

fileList = dir('*.jp*');
numFiles = length(fileList)
orderToUse = randperm(numFiles);
for k = 1 : numFiles
	% Get what random index this one is.
	index = orderToUse(k);
	% Construct the full filename.
	fullFileName = fullfile(fileList(index).folder, fileList(index).name);
	fprintf('Processing #%d of %d:\n  which is file #%d in the list : %s\n',...
		k, numFiles, index, fullFileName);
	% Now do something with the file....
end