
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
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