[Scilab-users] Problem with partial fraction decomposition (dfss)

[Serge Steer]

You just need to tune the rmax optionnal parameter
pf = pfss(tf2ss(hz),5);length(pf)

Serge Steer
Le 13/10/2014 10:12, tinnguyen a écrit :
> Hi guys,
> I'm having trouble using scilab's function pfss to decompose a polynomial in
> order to do inverse Z transform. Following is my code:
> --> z = poly(0,'z')
> --> hz = z^2 / (1 - 6*z + 11*z^2 - 6*z^3)
> --> pf = pfss(tf2ss(hz))
> --> length(pf)
> The fourth command returns '1'. However, I believe it should be 3. I also
> did the decomposition manually and got the result as: hz = 0.5/(1-z) + -1 /
> (1-2*z) + 0.5/(1-3*z).
> Nevertheless, if I change the numerator of hz from z^2 to z or z^3, pfss
> works correctly. I definitely have no idea!!!? :D
> Please take a look and correct me if i'm wrong.
> Thank you so much!
>
>
>
>
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