[R] Chull function

Richard.Cotton at hsl.gov.uk Richard.Cotton at hsl.gov.uk
Mon Mar 9 11:55:07 CET 2009

> Using a simulation, I have to find what are the probabilities that, 
> in a square region, the convex hull is a triangle, using the "chull"
> function.  However, I have a hard time with the chull function, i 
> did not see many examples in which the chull function is used.  I 
> searched a long time on google, but I did not find nothing.  So, if 
> anyone can help,

The chull function returns the indexes of the points in the input that 
form the convex hull.  Thus, to test whether or not the convex hull is a 
triangle, you simply test to see if its length is 3, i.e.
length(chull(x)) == 3

If you need more information, you'll have to provide a reproducible 


Mathematical Sciences Unit


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