Chull function

Isn't the single example enough in help(chull)?

In your case I think you are finding the probability of length(chull(x)) == 3.

Regards,
Yihui
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On Mon, Mar 9, 2009 at 11:29 AM, Alexandre Pratte

Hi everyone,

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,

Thanks!

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 
example.

Regards,
Richie.

Mathematical Sciences Unit
HSL


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