root() function gives compelx solution for cubic equation. how to get the nearby real root?
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Dear All:
i have a cubic equation and the coefficients are set already. But it always gives me the complex roots (all of them).
As i know, root() function of the matlab (in practice and theory) gives the very approximate roots for any polynomial that has more than quadratic.
So, is there anyway i can force the root to give me the most possible real roots?.
Thanks.
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Walter Roberson
2020-6-25
The roots function considers p to be a vector with n+1 elements representing the nth degree characteristic polynomial of an n-by-n matrix, A. The roots of the polynomial are calculated by computing the eigenvalues of the companion matrix, A.
Not Newton's method.
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