tf and damp, all need the numerical coefficients of the transfer function
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But I want the symbolic operation, how can I do ?
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Walter Roberson
on 15 May 2023
poles = solve(D, 'maxdegree', 4);
Typically this will create a quite long output. The exact symbolic solutions for the roots of degree 4 are complicated. When any of the coefficients are symbolic variables then there is little hope that you will get nice outputs. If all of the coefficients are numbers then from time to time you will get nice numeric solutions... but pretty much only for the case that someone deliberately created an easy form
Answers (1)
Sam Chak
on 21 May 2023
Hi @li hu
Finding the poles (roots of the denominator) is like solving polynomial equations.
However, if it is 5th-degree and higher polynomial, then it cannot be solved algebraically in terms of a finite number of additions, subtractions, multiplications, divisions, and root extractions.
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