Determine if input is cell array of character vectors
tf = iscellstr(A)
tf = iscellstr(A) returns
logical 1 (true) if A is
a cell array of character vectors (or an empty cell array), and logical 0 (false)
otherwise. A cell array of character vectors is a cell array where
every element is a character vector.
A{1,1} = 'Thomas Lee';
A{1,2} = 'Marketing';
A{2,1} = 'Allison Jones';
A{2,2} = 'Development';
iscellstr(A)
ans =
1