From mark0060@tc.umn.edu  Wed Jan 17 02:52:00 2001
From: mark0060@tc.umn.edu (mark0060@tc.umn.edu)
Date: Wed, 17 Jan 2001 03:52:00 +0100 (MET)
Subject: [Rd] PR#751
Message-ID: <200101170252.DAA19529@pubhealth.ku.dk>

I'd just like to report a possible R bug--or rather, confirm an existing one
(bug #751).

I have had some difficulty using the polyroot() function.

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

However,

> polyroot(c(-100,0,1))

gives the roots of

[1]  10+0i -10+0i

which corresponds to -100 + x^2, not 1 - (100*x^2).

Also,

> polyroot(c(0,0,0,1))

gives

[1]   0+0i   0+0i -10+0i

which aren't all roots of x^3.


Thanks for all your efforts.

I apologize if I'm missing something.

Kristian Markon











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[Rd] PR#751
mark0060@tc.umn.edu