Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uflorida!uakari.primate.wisc.edu!aplcen!ginosko!uunet!sdrc!gcchou
From: gcchou@sdrc.UUCP (jin chou)
Newsgroups: comp.graphics
Subject: Root Finding of Quartic Polynomial Equations
Keywords: Numerical Techniques
Message-ID: <797@sdrc.UUCP>
Date: 12 Sep 89 14:54:07 GMT
Distribution: na
Organization: Structural Dynamics Research Corp., Cincinnati
Lines: 14


I need _ROBUST METHODS_ to solve quartic polynomial equations of the
form: A X**4 + B X**3 + C X**2 + D X + E = 0.  Any implementation
experience is also welcome.  Note that DIRECT use of the close form 
formula does not satisfy the robustness requirement.

I recall that this question was posted a couple of years ago and
led to a lengthy discussion.  I do not want to restart the discussion
again.  So please respond to me directly.

Thank you in advance.


Jin  Chou (uunet!sdrc!gcchou)