In your situation, strcmp() instead of == would not be incorrect, but it is not the reason for failure.
The problem is in how you detect the end of the string. You are currently doing
if Code(counter) == ''
which assumes two things:
- that at the end of Code there will somehow be an empty string that neither you nor the user explicitly put there; and
- that you can compare to the empty string using ==
Comparing to an empty array using one of the relational operators always returns false in MATLAB. Using if strcmp(Code(counter), '') would at least remove the problem about comparing to the empty array, but it would not remove the question of how that empty array got there.
In MATLAB, there is no empty array and no byte of binary 0 at the end of a string. If you run off the end of the array then you get index exceeds matrix dimension.
You should change your code from using that while to using a for over length() of the string.
