Hi
Did you read what ellipse does and how it shall be used?
And what about your system, R and ellipse version?
>From your example i got
> ellipse (center = c(0,0), shape = shape1, radius = 1)
Error in ellipse.default(center = c(0, 0), shape = shape1, radius =
1) :
Argument "x" is missing, with no default
Ellipse is not for drawing arbitrary ellipses but has different usage.
See its help page and an example.
Cheers
Petr
On 27 Oct 2004 at 3:34, 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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Petr Pikal
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