%!demo
%! ## A table is a *column* when it has a single variable — regardless of how
%! ## many columns that variable spans internally.
%!
%! T1 = table ([1; 2; 3], 'VariableNames', {'x'})
%! iscolumn (T1)
%!
%! ## The lone variable may itself be multi-column; the table is still a column.
%! T2 = table ([1 2; 3 4; 5 6], 'VariableNames', {'xy'})
%! iscolumn (T2)
%!
%! ## Two or more variables make it no longer a column.
%! iscolumn (table ([1; 2; 3], [4; 5; 6]))
