[R] ploting an ellipse keeps giving errors

[Jari Oksanen]

On Wed, 2004-10-27 at 11:34, 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!

Sun, did you read the ?ellipse help page? I just read, but I didn't find
arguments 'center', 'shape' or 'radius' there. It could be useful to use
argument specified in the help page.  Section 'Details' of ?ellipse
explains the parametrization.

cheers, jari oksanen

-- 
Jari Oksanen <jarioksa at sun3.oulu.fi>