>> X= num2str(randn(6,6)) 
X =
  -1.1465    -0.18671      1.0668     0.71432      -1.441      1.2902
   1.1909     0.72579    0.059281      1.6236     0.57115      0.6686
   1.1892    -0.58832   -0.095648    -0.69178    -0.39989      1.1908
-0.037633      2.1832    -0.83235       0.858        0.69     -1.2025
  0.32729     -0.1364     0.29441       1.254     0.81562    -0.01979
  0.17464     0.11393     -1.3362     -1.5937     0.71191    -0.15672
>> >> num2str(pi,10)
ans =
3.141592654
>> num2str(pi,30)                        %將圓周率輸出位數設定為30位
ans =
3.1415926535897931                     %可見最多的輸出位數為小數點后16位 
>>