How to perform reduced row echelon form on a non-square GF matrix.

G(2^8), m=8

mat1 = gf([160 28 233 185 176],8);

result1 = gf([160 28 233 185 176],8)/gf([160],8) % 1 77 174 32 220

[R,jb] = rref([1 77 174 32 220;189 244 80 245 190])

% I use the result from result1 as 1st row and progressively add the next row vector [189 244 80 245 190]

% reduced row echelon

mat2 = [1 77 174 32 220;189 244 80 245 190]

rref works without GF(2^8). But I am unable to perform the reduction using GF(2^8) . Can someone help me to find a solution and how to proceed?

I will be using the result from the above and append another row-vector to the it.