How can I pull a random image to display, from a folder of images using Psychtoolbox?

Hello,

I am trying to show an image, randomly selected from a folder of images. I'm using Psychtoolbox. How do I instruct it to pull an image randomly from the folder, to display on the screen? The images can be used more than once.

Thanks!!

Answer 1

[Orion]

I don't know this toolbox (not sure a lot of people do).

but in a general way, with matlab, you can do something like

% get all images (here all *.jpg found in the current directory, but you can specify the format you want)
MyImages = dir(fullfile(pwd,'*.jpg'));

% generate a random number between 1 and the number of images
RandomNumber = randi([1 size(MyImages,1)]);

% get the corresponding name of the image 
MyRandomImage = MyImages(RandomNumber).name;

% display the image
image(imread(MyRandomImage));

Answer 2

[Sean de Wolski]

Perhaps use randi to generate a random index between 1 and the number of files.