non-singular matrix using Galois field

Hello everyone,

I am generating a matrix using Galois field with the following code.

k=3;
 m=2;
 prim_poly = gfprimdf(k,m);%[2 2 1];
 code_vec_set = gftuple([-1:k^m-2]',prim_poly,k);

from the set randomly i am considering three rows and creating a matrix(suppose X)..is there any way to make sure this X is non-singular

thanking you in advance