from    math        import fabs

 from    dionysus    import Rips, Filtration, StaticPersistence #, enable_log

 # Simple minded pairwise distance functor distance

 class Distances:

     def __len__(self):

         return 5

     def __call__(self, x, y):

         return fabs(y-x)

 dist = Distances()

 r = Rips(dist)

 lst = []

 lst2 = []

 #enable_log('rips')

 r.generate(1, 3, lst.append)

 r.generate(1, 3, lst2.append, [0,2,4])

 print "Rips complex on all vertices:", lst

 print "Rips complex on vertices [0,2,4]):", lst2

 print "Values:", [map(r.eval, lst)]

 print "Sorted:", sorted(lst, r.cmp)

 cofaces = []

 r.vertex_cofaces(2, 1, 3, cofaces.append)

 print "Cofaces of vertex 2:", cofaces

 cofaces = []

 r.vertex_cofaces(2, 1, 3, cofaces.append, [0,2,4])

 print "Cofaces of vertex 2 on vertices [0,2,4]:", cofaces

 f = Filtration(lst, r.cmp)

 p = StaticPersistence(f)

 p.pair_simplices()

 for s in p:

     print lst[f[p(s)]], s.sign()