[Scilab-users] improve accuracy of roots

[Dang Ngoc Chan, Christophe]

Hello,

> De : users [mailto:users-bounces at lists.scilab.org] De la part de Federico Miyara
> Envoyé : jeudi 10 janvier 2019 00:32
>
> // Define fourth degree polynomial
> R = (1 + p)^4;
>
> // Find its roots
> z = roots(R)
> [...]
> but the error in the roots is too large.

The help page mentions that:
"This implies that just representing the coefficients as IEEE doubles changes the roots."
https://help.scilab.org/docs/6.0.1/en_US/roots.html

> Is there some way to improve the accuracy?

The "f" option does not work so I have no clue here, sorry.

Regards

--
Christophe Dang Ngoc Chan
Mechanical calculation engineer

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