Definition

-->s=poly(0,'s');
-->h=syslin('c',[1/s,1/(s+1);1/s/(s+1),1/(s+2)/(s+2)])
 h  =
!   1           1         !
!   -         -----       !
!   s         1 + s       !
!                         !
!     1           1       !
!   -----     ---------   !
!        2              2 !
!   s + s     4 + 4s + s  !
-->w=tf2ss(h); // compute state space representation
-->ss2tf(w)  // back to transfer function represenation
 ans  =
!         1                 1             !
!   -------------         -----           !
! - 4.710D-16 + s         1 + s           !
!                                         !
!    1 + 6.935D-16s       1 + 2.448D-16s  !
!   ----------------      --------------  !
!                    2                2   !
! - 1.610D-15 + s + s       4 + 4s + s    !
-->h1=clean(ans)  // set to zero the unsignificant coefficients
 h1  =
!   1           1         !
!   -         -----       !
!   s         1 + s       !
!                         !
!     1           1       !
!   -----     ---------   !
!        2              2 !
!   s + s     4 + 4s + s  !