MATLAB: How to cancel same pole-zero pair for Z-function

cancel the same pole-zero pair for z-function

With matlab, How to cancel the same pole-zero pair for Z-function , for example : minreal for s-function?

Best Answer

The minreal function works with discrete systems.
Example — 
n = [1    -9    26   -24];
d = [1   -12    41   -42];
tfs = tf(n,d);
figure
bode(tfs)
[ps,zs] = pzmap(tfs)
rs = minreal(tfs)
tfz = tf(n, d, 0.1)
figure
bode(tfz)
[pz1,zz1] = pzmap(tfz)
rz = minreal(tfz)
For the continuous system: 
rs =
  s - 4
  -----
  s - 7
and for the discrete system: 
rz = 
  z - 4
  -----
  z - 7
In both, it cancels the poles-zeros at 2 and 3.
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