Matlab extract coefficient from z transform function
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Hi I have a z transform function 3/z + 5/z^2 + 6/z^3 + 1
How would I extract the coefficients from this equation? I have tried using coeffs and it says it is not a polynomial.
I would like the answer to come out as [3 5 6 1]
The symbolic z variable is declared as syms z
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Star Strider
2014-5-10
编辑:Star Strider
2014-5-10
syms z
fz = 3/z + 5/z^2 + 6/z^3 + 1
[fzn, fzd] = numden(fz)
fzc = sym2poly(fzn)
fzc = circshift(fzc, [0 -1])
produces:
fzc =
3 5 6 1
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Star Strider
2014-5-10
My pleasure!
The sym3poly function would work with a ‘normal’ polynomial, but the symbolic terms in the denominator require numden and then circshift.
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