Matlab char数组中的前导零

Question

I have an integer array that has zeros in it, but when I convert it into a char array, the leading zeros are gone. How can I have leading zeros in a char array?

For example: it prints ' 4D9' instead of '004D9' . How do I print the leading zeros?

Answer 1

Assuming you mean to print the integers in hexadecimal with leading zeros, you just need the leading 0 flag in the formatspec :

>> n = 1241;
>> s = num2str(n,'%05X')
s =
004D9

Answer 2

I go through each element in the number array and convert it to a string. I then concatenate these together

a = [0,0,2,3,4,5,6]; 
my_str = '';

for ii=1:numel(a)
    my_str(ii) = num2str(a(ii));
end
disp(my_str)

this gives the output '0023456'