Macaulay2 » Documentation
Packages » Polyhedra :: isEmpty

next | previous | forward | backward | up | index | toc

isEmpty -- checks if a Polyhedron is empty

Usage:

b = isEmpty P
Inputs:
- P, a convex polyhedron
Outputs:
- b, a Boolean value, true if the Polyhedron is empty, false otherwise

Description

The polyhedron is empty if the dimension is -1.

i1 : P = polyhedronFromHData(matrix{{1,0},{0,1},{-1,-1}},matrix{{-1},{1},{-1}})

o1 = P

o1 : Polyhedron

i2 : isEmpty P

o2 = true

Ways to use isEmpty:

isEmpty(Polyhedron)
isEmpty(Thing) -- see isEmpty -- whether an object is empty
isEmpty(RRi) -- empty test for an interval

For the programmer

The object isEmpty is a method function.

The source of this document is in Polyhedra/documentation/old_documentation.m2:1243:0.