Hi All,
I want to add one point to contourplot().  I used contourplot() in my code like
contourplot(z ~ a + b |c, data)
I understand there is plot.axes argument for filled.contour(), but it  did not work for my code. I also tried plot() and text() for contourplot(), but got this error: "plot.new has not been called yet"
Any suggestion for adding a point in contourplot()?
Thank you very much!
Lily D



      
	[[alternative HTML version deleted]]

