Convex Hull of a pointset in plane.

1 | ```
convexhull(x, y=NULL,...)
``` |

`x` |
The data as a matrix, data frame or list. If it is a matrix or data frame, then each row is viewed as one bivariate observation. If it is a list, all components must be numerical vectors of equal length (coordinates of observations). |

`y` |
The data as a matrix, data frame or list. If it is a matrix or data frame, then each row is viewed as one bivariate observation. If it is a list, all components must be numerical vectors of equal length (coordinates of observations). |

`...` |
For future use. |

In dimension 2, calculates Convex Hull of a pointset.

Returns with respect to data set, ordered set of points on the convex hull.

Nabil Mustafa, Saurabh Ray, and Mudassir Shabbir.

N. Mustafa, S. Ray, and M. Shabbir, Statistical Data Depth of Pointsets in the Plane,*in prep.*.

1 2 3 | ```
## calculation of centroid of a random pointset
z = matrix(rnorm(24),nc=2)
x = convexhull(z)
``` |

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