>> B1=[1,0;1,0];B2=[1,0;0,1];B3=[0,1;1,1];B4=[1,1;1,1];
a=zeros(2,2);
for i=1:2,
    for j=1:2,
    a(i,j)=sym([num2str(B4(i,j)) num2str(B3(i,j)) num2str(B2(i,j)) num2str(B1(i,j))])
    end
end

a =

        1011           0
           0           0


a =

        1011        1100
           0           0


a =

        1011        1100
        1101           0


a =

        1011        1100
        1101        1110

>> class(a)

ans =

double

>> whos
  Name      Size            Bytes  Class     Attributes

  B1        2x2                32  double              
  B2        2x2                32  double              
  B3        2x2                32  double              
  B4        2x2                32  double              
  a         2x2                32  double              
  ans       1x6                12  char                
  i         1x1                 8  double              
  j         1x1                 8  double