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roots function algorithm basis

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Estanislao Gavilan Pascual Ahuir
回答： Neil Guertin 2017-8-11
Dear Community,
I am trying to understand how works root(P), being P a polynomial. As far as I know, MATLAB uses the companion matrix of P and after it uses QR factorization to get the roots. However, I do not know which QR factorization method it uses. Is it householder QR method?
Thanks so much for your help,
Estanis

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Neil Guertin
Neil Guertin 2017-8-11
According to the documentation, "The roots of the polynomial are calculated by computing the eigenvalues of the companion matrix". Eigenvalues are calculated using LAPACK functions.

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