Dear UseRs, A point was plotted by the following command plot(2,4,ylim=c(0,10),xlim=c(0,5)) how to divide the space around the plotted point into six regions each of 60 degree as shown in the Figure 2a) in the following link http://infolab.usc.edu/csci599/Fall2007/papers/b-2.pdf. Thankyou very much in advance, Eliza. [[alternative HTML version deleted]]