From ripley@stats.ox.ac.uk  Tue Mar 20 11:52:26 2001
From: ripley@stats.ox.ac.uk (ripley@stats.ox.ac.uk)
Date: Tue, 20 Mar 2001 12:52:26 +0100 (MET)
Subject: [Rd] A limitation for polyroot ? (PR#880)
Message-ID: <200103201152.MAA25198@pubhealth.ku.dk>

On Mon, 19 Mar 2001 chyihung.hsu@pharma.Novartis.com wrote:

> Dear R Development Team,
>
> I have encountered the following difficulty in using the function polyroot
> under either NT4.0  (R version 1.2.1) or linux (R version 0.90.1).  In the
> provided example, the non-zero root of c(0,0,0,1) depends on the results of
> the previous call of polyroot.

This is AFAIK already solved in 1.2.2.  Please upgrade, at least that
Linux version ....

>
> R : Copyright 2001, The R Development Core Team
> Version 1.2.1  (2001-01-15)
>
> R is free software and comes with ABSOLUTELY NO WARRANTY.
> You are welcome to redistribute it under certain conditions.
> Type `license()' or `licence()' for distribution details.
>
> R is a collaborative project with many contributors.
> Type `contributors()' for more information.
>
> Type `demo()' for some demos, `help()' for on-line help, or
> `help.start()' for a HTML browser interface to help.
> Type `q()' to quit R.
>
> [Previously saved workspace restored]
>
> > polyroot(c(6,-5,1))
> [1] 2+1.615587e-27i 3-1.615587e-27i
> > polyroot(c(0,0,0,1))
> [1] 0+0.000000e+00i 0+0.000000e+00i 3-1.615587e-27i
> > polyroot(c(4,-4,1))
> [1] 2+1.110223e-16i 2-1.110223e-16i
> > polyroot(c(0,0,0,1))
> [1] 0+0.000000e+00i 0+0.000000e+00i 2-1.110223e-16i
> >
>
> Thank you for your attention.
>
> Best regards,
>
> Chyi-Hung Hsu
>
>
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-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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[Rd] A limitation for polyroot ? (PR#880)
ripley@stats.ox.ac.uk