You can use following code to run slideshow because it will run in background.
function slideshow
global indx
indx=1;
showTimer=timer('timerFcn',@timefcn);
set(showTimer,'ExecutionMode','fixedRate');
start(showTimer)
function timefcn(varargin)
global indx
imgNameList= char('1.jpg','2.jpg','3.jpg');
a=imread(imgNameList(indx,:));
indx=indx+1;
if indx>10
indx=1;
end
imshow(a);
drawnow;
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