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Change of variable

-->z=poly(0,'z');
-->horner(h,(1-z)/(1+z))  //bilinear transform
 ans  =
!   1 + z          1 + z       !
!   -----          -----       !
!   1 - z            2         !
!                              !
!             2              2 !
!   1 + 2z + z     1 + 2z + z  !
!   ----------     ----------  !
!                            2 !
!     2 - 2z       9 + 6z + z  !


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