How do I split double-digit elements in a vector into two separate elements?

I have a vector, v = [1 18 9 8], and I'm trying to split up the 18 into two separate elements so that the new vector would be new_vec = [1 1 8 9 8]. Any ideas on how to approach this?

Answer 1

[Andrei Bobrov]

v = [1 18 9 8];
new_vec  = sprintf('%d',v)-'0';

Answer 2

[bio lim]

Simple approach would be:

v = [1 18 9 8];

for i = 1 : length(v)
    new_vec{i} = num2str(v(i)) - '0'
end

new_vec = cell2mat(new_vec);

The output is:

new_vec =

       1     1     8     9     8