On Thu, 4 Feb 2010 00:43:10 -0800 (PST), Nathann Cohen <nathann.co...@gmail.com> wrote: > Could you be by any chance trying to compute the convex hull of a set > of points ?
In which case you would want to do for example: sage: poly = Polyhedron(vertices=[(0, 0), (3, 0), (0, 3), (1, 1)]) sage: poly A 2-dimensional polyhedron in QQ^2 defined as the convex hull of 3 vertices. sage: poly.vertices() [[0, 0], [3, 0], [0, 3]] Note that Sage realised that (1, 1) was in the interior and ignored it. There are a bunch of things you can do with your shiny new polygon now, here is what tab-completion gives me: sage: poly. poly.Hrep_generator poly.field poly.projection poly.Hrepresentation poly.gale_transform poly.pyramid poly.Vrep_generator poly.graph poly.radius poly.Vrepresentation poly.ieqs poly.radius_square poly.adjacency_matrix poly.incidence_matrix poly.ray_generator poly.ambient_dim poly.inequalities poly.rays poly.bipyramid poly.inequality_generator poly.rename poly.bounded_edges poly.intersection poly.render_solid poly.category poly.is_compact poly.render_wireframe poly.cdd_Hrepresentation poly.is_simple poly.reset_name poly.cdd_Vrepresentation poly.line_generator poly.save poly.center poly.linearities poly.schlegel_projection poly.db poly.lines poly.show poly.dim poly.lrs_volume poly.simplicial_complex poly.dump poly.n_Hrepresentation poly.triangulated_facial_incidences poly.dumps poly.n_Vrepresentation poly.union poly.edge_truncation poly.n_equations poly.version poly.equation_generator poly.n_facets poly.vertex_adjacencies poly.equations poly.n_inequalities poly.vertex_adjacency_matrix poly.f_vector poly.n_lines poly.vertex_generator poly.face_lattice poly.n_rays poly.vertex_graph poly.facet_adjacency_matrix poly.n_vertices poly.vertex_incidences poly.facial_adjacencies poly.polar poly.vertices poly.facial_incidences poly.prism Feel free to explore these and ask more questions. Best, Alex -- Alex Ghitza -- Lecturer in Mathematics -- The University of Melbourne -- Australia -- http://www.ms.unimelb.edu.au/~aghitza/ -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
