isPointed -- checks if a Cone or Fan is pointed

Usage:

b = isPointed C

b = isPointed F
Inputs:
- C, a convex rational cone
- F, an instance of the type Fan
Outputs:
- b, a Boolean value, true if the Cone or the Fan is pointed, false otherwise

Description

Tests if a Cone is pointed, i.e. the lineality space is 0. A Fan is pointed if one of its Cones is pointed. This is equivalent to all Cones being pointed.

i1 : C = coneFromHData(matrix{{1,1,-1},{-1,-1,-1}})

o1 = C

o1 : Cone

i2 : isPointed C

o2 = false

i3 : C = intersection{C, coneFromHData(matrix{{1,-1,-1}})}

o3 = C

o3 : Cone

i4 : isPointed C

o4 = true

Ways to use isPointed:

isPointed(Cone)
isPointed(Fan)

For the programmer

The object isPointed is a method function.

The source of this document is in Polyhedra/documentation/old_documentation.m2:1343:0.