Replace ClassName with the name of the class for which you want to create the empty array.
But in order to use the empty method, the size of the array you want to create must be 0 in at least one of its dimensions. You can't, for example, have a 2-by-2 empty array. If you want to make a double 2-by-2 array, use zeros, ones, rand, eye, etc.
x = zeros(2);
y = ones(2, 'single');
z = int8.empty(2, 2, 0)