[Rd] A limitation for polyroot ? (PR#880)

[ripley@stats.ox.ac.uk]

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
>
>
> -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
> r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
> Send "info", "help", or "[un]subscribe"
> (in the "body", not the subject !)  To: r-devel-request@stat.math.ethz.ch
> _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
>

-- 
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)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595


-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-devel-request@stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._