The best practize is not to try to pack all processing into single lines. One-liner are appealing, but they are not necessarily efficient, most of all when you take into account the readability of the code. Because debugging is often more time consuming than the run time, "optimizing" code to one-liners is not useful.
You could create an own function for such a splitting:
function varargout = Split(X)
if nargout ~= numel(X)
error('Dimensions do not match.');
end
for k = 1:nargout
varargout{k} = X(k);
end
end
Then:
[Offset_1 Offset_2 X_Size Y_Size] = Split(get(groot,'ScreenSize'));
But I prefer the simple stupid:
Size = get(groot,'ScreenSize')
X_Size = Size(1,3);
Y_Size = Size(1,4);
