what the fault in my code

I have problem with this code

        skAx=1966
        skAy=4372
        p=5449
        Pmlx(1)=10
        Pmly(1)=2
        Cm3(1)=mod(Pmlx(1)+skAx+skAy,p)
        Cm4(1)=mod(Pmly(1)+Cm3(j),p)

when I implement, the result below

        Cm3 = 255
        Cm4 = 255

while the correct result must be

        Cm3 = 899
        Cm4 = 901

Answer 1

[John D'Errico]

Hint: Don't stuff your results into vectors that are defined to be uint8.

The test is simple.

class(Pmlx)
class(Pmly)
class(cm3)
class(cm4)

One or more of those variables is uint8.

[Jan]

+1. Example to reproduce this behavior:

a    = uint8(16);
a(1) = 1966;
disp(a)
>>  255