How to get the largest positive root of a polynomial
Subject: How to get the largest positive root of a polynomial
From: Richard Fateman
Date: Mon, 19 Dec 2005 18:01:01 -0800
Stavros Macrakis wrote:
> Try sort(map(rhs,...)) or apply('max,map(rhs,...))
>
> If you only want real roots, use realroots.
>
> Does that solve your problem?
>
> If not how can I sort the list to get the largest positive root?
>
>
Using realroots is a sensible alternative if the polynomial
is small and you are not in a hurry, or if it is very
ill-conditioned and you want to isolate the roots using
exact rational arithmetic. And you are not in a hurry.:)
Maybe sorting should be done on realparts?
RJF