[comp.graphics] Root Finding of Quartic Polynomial Equations

gcchou@sdrc.UUCP (jin chou) (09/12/89)

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)