The command convexhull(P) returns a list of points defining the convex hull of the points in P in counter-clockwise order.

Every point in P must be a list of an x and y coordinate, both of which must be numbers (of type numeric).

If the option output=area is specified, the area of the convex hull of the points is returned.

If the option output=hull is specified, the convex hull is is returned as a list of points.  This is the default return value.

If the option output=plot is specified, a plot of the points and the convex hull is returned.

Multiple outputs can be specified, for example, output=[hull,area] returns a sequence of two values.

An  algorithm computing tangents of pairs of points is used.

For a slightly more geometrical interpretation of the same command, see geometry[convexhull].  The points input and output are geometric points, and the output is considered to be a convex polygon.

The command with(simplex,convexhull) allows the use of the abbreviated form of this command.

U01 := proc() Float( R(), -10 ) end proc: