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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