Re: [Boost-users] [math] Solving quadratic, cubic & quartic functions

Subject: Re: [Boost-users] [math] Solving quadratic, cubic & quartic functions
From: Fredrik Orderud (forderud_at_[hidden])
Date: 2013-08-18 15:44:17

On Sun, Aug 18, 2013 at 4:02 PM, Júlio Hoffimann
<julio.hoffimann_at_[hidden]>wrote:

>
> I've run into an eigenvalue problem where I need to compute the roots of a
>> cubic polynomial.
>>
>
> If you're trying to solve the characteristic equation det(A-\lambda I) = 0
> by hand, it's the wrong path. Try using an appropriate library for solving
> eigenproblems.
>

I'm aware that some lin-alg libraries, such as e.g. Eigen, includes
eigenvalue solvers that might suit my needs. It would, however, be an
advantage for me to avoid introducing any additional dependencies just to
solve this "tiny" problem. Boost math already includes several math
functions for root finding, so I was surprised over the lack of functions
to solve lower order polynomials.

Fredrik