[Rd] A limitation for polyroot ? (PR#880)
ripley@stats.ox.ac.uk
ripley@stats.ox.ac.uk
Tue, 20 Mar 2001 12:52:26 +0100 (MET)
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 ....
>
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> Version 1.2.1 (2001-01-15)
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> [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/
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