You have to add a blank (or empty) character to do that.
For example, with a cell array:
a19 = strsplit(sprintf('%c ','a':'s')); % Create Cell Array
a20 = cat(2, a{1:19}, {''}); % Concatenate Empty Cell
A = reshape(a20, 4, 5); % Reshape To Get (4x5) Array
You didn’t post anything specific about what you’re doing, but some variation on this idea should give you the result you want.
