Matlab extract coefficient from z transform function
12 views (last 30 days)
Show older comments
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
0 Comments
Accepted Answer
Star Strider
on 10 May 2014
Edited: Star Strider
on 10 May 2014
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
2 Comments
Star Strider
on 10 May 2014
My pleasure!
The sym3poly function would work with a ‘normal’ polynomial, but the symbolic terms in the denominator require numden and then circshift.
More Answers (0)
See Also
Categories
Find more on Number Theory in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!