print matrix of month

hello im supposed to create a function that gets input of a month and year and im supposed to get output prinnted my problem is that every time the function gets to dates like 10 or 20 it only prints 1 2 so instead of 11 12 13 14...i get 1 12 13 14... i tried doing if w(i,j)='10' fprintf('10') but it says it is not possible to compare strings im not aloowed to usestrcmp

function fprintfmatrix(mat)
w=num2str(mat);
rows=size(w,1);
col=size(w,2);
for i=1:rows;
  for j=1:col;
      if w(i,j)~='0'
           fprintf(w(i,j))
         elseif w(i,j)=='0'; 
          fprintf(' ')
     end
  end

       fprintf('\n')    
end
end

[Azzi Abdelmalek]

Give a sample of your data

[Walter Roberson]

duplicated by http://www.mathworks.co.uk/matlabcentral/answers/106881-how-to-coampre-strings-and-print