How to generate a matrix using permutations

How can I create a matrix where I compare different values of a function to itself, where the function depends on x variables which vary from the integer value y up to the integer z.

For example, if x =2, y=0 and z=1, then the possible functions would be f(0,0), f(0,1), f(1,0) and f(1,1). These would then be subtracted from each in a four by four matrix. For example the first column, first row would be f(0,0)-f(0,0).

Answer 1

[KSSV]

x =2; y=0 ; z=1 ;

   A = [y z] ;
   iwant = perms(A)