[R] ploting an ellipse keeps giving errors

[Sun]

Thanks a lot. I added that line.

library(ellipse)
plot(-2:2, type='n')
shape1 = c (1, 0, 0,1)
dim(shape1) = c(2,2)
center1 = c(0,0)
radius1 = 1
ellipse (center1, shape1, radius1)

But now it said:

Error in ellipse(center, shape, radius) : dim<- : dims [product 4] do not
match the length of object [200]

What is wrong?

I don't understand the shape and radius's meaning so I have no idea of what
object's lenght.

Many thanks!

Sun
----- Original Message ----- 
From: "Patrick Burns" <pburns at pburns.seanet.com>
To: "Sun" <sun at cae.wisc.edu>
Sent: Wednesday, October 27, 2004 3:51 AM
Subject: Re: [R] ploting an ellipse keeps giving errors


> The error message is telling you that it expects a plot to already be
> there.  You can do something like:
>
> plot(-2:2, type='n')
>
> Patrick Burns
>
> Burns Statistics
> patrick at burns-stat.com
> +44 (0)20 8525 0696
> http://www.burns-stat.com
> (home of S Poetry and "A Guide for the Unwilling S User")
>
> Sun wrote:
>
> >library (ellipse)
> >
> >shape1 = c (1, 0, 0,1)
> >dim(shape1) = c(2,2)
> >ellipse (center = c(0,0), shape = shape1, radius = 1)
> >
> >=============================
> >Error in plot.xy(xy.coords(x, y), type = type, col = col, lty = lty, ...)
:
> >        plot.new has not been called yet
> >
> >
> >It is really frustrating. Also what do the shape matrix, radius
correspond to an ellipse function
> >
> >(x-x0)^2/a + (y-y0)^2/b = 1
> >
> >? Please advise!
> >
> >Many thanks,
> >
> >Sun
> > [[alternative HTML version deleted]]
> >
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> >
> >
> >
> >
>
>
>