MATLAB: Presenting random images from a file, where each image is presented only once

imagespsychtoolboxrandomrandom images

Hi,
This is my fourth day of coding ever so bear with me.
Right now I have a folder with images. I want to present each image from the folder randomly once and only once for a certain number of trials.
So far my code looks like this. It successfully presents a random image from the folder, but it can use the same images over again which I don't want.
How do I make it so that each image in the folder is displayed once and only once?
Thank you in advance for your help!
emotionalImageDirectory = 'C:\PsychExperiment\Emotional';
imageTwoVarOne = dir([emotionalImageDirectory '\*.jpg']);
imageTwoVarTwo = numel(imageTwoVarOne);
idx = randi(imageTwoVarTwo);
loadimageTwo = imread(imageTwoVarOne(idx).name);

Best Answer

Store a random sequence of the images in advance and then cycle through them one by one. Something like this,
emotionalImageDirectory = 'C:\PsychExperiment\Emotional';
imageTwoVarOne = dir([emotionalImageDirectory '\*.jpg']);
imageTwoVarTwo = numel(imageTwoVarOne);
imageseq = randperm(imageTwoVarTwo);
for i=1:imageTwoVarTwo  % or the number of trials you want, which may be less than the n of images
    idx = imageseq(i);
    loadimageTwo = imread(imageTwoVarOne(idx).name);
end
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