----- Original Message -----
From: "Aleksandar N. Donev" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, February 18, 2003 2:14 AM
Subject: Quartic equations
> Hello,
>
> Does someone have a routine for a quartic polynomial root solver? I need
> to find the smalles real positive root of a quartic polynomial or know
> that it does not exist. In cases when it does exist, it is likely that I
> have a very good initial guess just by solving the corresponding quadratic
> equation (ignoring two terms, since they are small!), but simply deciding
> whether there is a positive real root seems hard (Sturm sequences?). The
> code will be used in public-domain libraries.
>
> Any advice from the experiences appreciated.
> Snowed-In Aleksandar
You will find qtcrt.f90 at my web site, in the code from the NSWC library.
Cheers
Alan Miller
http://users.bigpond.net.au/amiller
Retired Statistician
|