# [Rd] PR#751

**Peter Dalgaard BSA
**
p.dalgaard@biostat.ku.dk

*17 Jan 2001 18:00:38 +0100*

apjaworski@mmm.com writes:
>* ... snip ...
*>*
*>* > For example, in Win 98, R 1.1.1,
*>* >
*>* > > polyroot(c(2,1,1))
*>* >
*>* > correctly (per the help index) gives the roots of 1 + (1*x) + (2*x^2) as
*>* >
*>* > [1] -0.5+1.322876i -0.5-1.322876i
*>*
*>* Mm, no. The coefficients are by increasing degree, so these are the
*>* roots of 2+x+x^2
*>*
*>* ... snip ...
*>*
*>* The manual page seems to have a typo. It says (1.2.0 on Win)
*>*
*>* Arguments:
*>*
*>* z: the vector of polynomial coefficients in decreasing order.
*>*
*
I suppose that could be clearer (it kind of depends on what you
consider the "normal" order), but it also has
p(x) = z1 + z2 * x + ... + z[n] * x^(n-1)
which should be clear enough.
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk) FAX: (+45) 35327907
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