how to solve index exceeds dimensions

a is 1*80 bit matrix

b is 1*16 matrix. This remains same. All the 16 binary bits in b remains same

code is 1*16 matrix. Code variable changes and selects diffierent 16 binary bits. Each time it has random, different selection of binary bits.

bits = 5;
gain = 16;
for p = 1:bits
    for m = 1:gain
        position=m+(p-1)*gain;
    a(position) = xor(b(position),code(m));  
    end
end

I am getting index exceeds dimensions error in a(position) = xor(b(position),code(m)); the idea is to put 1st xor(b and code) in first 16 bits of a, in 2nd run next xor(b and code) in 17-31 columns of a and so on.

Kindly help in solving the error.

[KSSV]

In the loop position = 17. And you have b, code as 1x16...so obviously you will get this error.

Answer 1

[Debasish Samal]

In the line a(position) = xor(b(position),code(m));

The variable 'position' should not be used for indexing into b as it will exceed the size of b when m>1.

replace 'position' by m. That should solve the issue.

a(position) = xor(b(m),code(m));

Good Luck!