load data
class(x0_test)
The minimum value an 8-bit unsigned integer can have is 0, and the maximum value is 2^8-1 = 255.
In MATLAB, the convention when performing an operation on a variable of an integer class that will cause the variable to exceed the maximum value for the class (such as adding 1 to an 8-bit unsigned integer whose value is 255) is to cap the value of the variable at the max value of the class. That's why 255 stays at 255 after adding 1.
x = uint8(255:-15:1)
x+1
x+2
x+100
