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From: "evan klinger" <eklinger1-nospam@cox.net>
Newsgroups: comp.soft-sys.matlab
Subject: Re: Solve Equation Symbolically
Date: Mon, 12 Nov 2007 22:25:17 +0000 (UTC)
Organization: The MathWorks, Inc.
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roberson@ibd.nrc-cnrc.gc.ca (Walter Roberson) wrote in
message <fhaiam$k8$1@canopus.cc.umanitoba.ca>...
> In article <fhag57$bca$1@fred.mathworks.com>,
> evan klinger <eklinger1-nospam@cox.net> wrote:
> >Is there a way to increase the 25,000 character limit? I
> >really need to solve up to cv12, I just used up to cv3 to
> >demonstrate what I'm trying to do. However, using
> >solve(collect(expand(cv12))) returns an error:
> 
> >??? Error using ==> solve at 162
> >Unable to find closed form solution.
> 
> It isn't any 25000 character limit that is getting you:
> you are trying to find the closed form solution to a
polynomial
> of order 12 that does not happen to be factorable down
> to polynomials of degree 5 or less (degree 5 is the maximum
> for which closed form polynomial solutions always exist.)
> 
> Using Maple directly, there is simply no closed form solution
> available for cv12. Beyond cv3, even where the closed form
> solutions exist in principle, Maple will just show a
generalized
> placeholder instead (closed form quadratics and quintics are
> pretty messy at the best of times.)
> -- 
>   "Is there any thing whereof it may be said, See, this is
new? It hath
>   been already of old time, which was before us."    --
Ecclesiastes

So what are my options here? I would like a closed form
solution so that I can plug in values into the variables
directly and solve, but if that's not possible, is there any
alternative?

Thank you for all your help so far