How do I plot an ellipse in R?

I am trying to teach myself R
When I run the script below:

library(ellipse)
polygon <-ellipse(x, scale = c(1, 1), centre = c(0, 0), level = 0.95, which = c(1, 2), npoints = 200)
plot(polygon)

I get the attached
How do I change this into a horizontal ellipse?

What is the value of x? Try plotting the result of ellipse(0.8)as in the documentation example. Does that work?

Thank you, It works