Murphy O'Brien

This could be the simplest way to control a loop of images showing, by pausing anywhere, and then check image value and so on:

figure
pause on;
set(gcf,'SelectionType','extend');

for i=1:10000 %your loop
    st=get(gcf,'SelectionType');
    if st(1)=='n'
        pause
    end
    set(gcf,'SelectionType','extend');
    
    %your own scripts, example
    imagesc(randn(100,100))
    drawnow
end

Why not just use 'keyboard' instead of input and evalin? That way you can type as many commands as you like before restarting.

Great function. Used it before discovering hist3.