Singular

D.13.1.14 latticeArea

Usage:

latticeArea(polygon); polygon list

Assume:

polygon is a list of integer vectors in the plane

Return:

int, the lattice area of the convex hull of the lattice points in polygon, i.e. twice the Euclidean area

LIB "polymake.lib";
// define a polygon with lattice area 5
list polygon=intvec(1,2),intvec(1,0),intvec(2,0),intvec(1,1),
intvec(2,1),intvec(0,0);
latticeArea(polygon);