24 | | --------------------------------------------------------------------------- |

25 | | AttributeError Traceback (most recent call last) |

26 | | <ipython-input-55-aea1b8b1f057> in <module>() |

27 | | ----> 1 Polyhedron(vertices=[[f]]) |

28 | | |

29 | | /Users/jplab/sage/sage2/src/sage/misc/lazy_import.pyx in sage.misc.lazy_import.LazyImport.__call__ (/Users/jplab/sage/sage2/src/build/cythonized/sage/misc/lazy_import.c:4007)() |

30 | | 387 True |

31 | | 388 """ |

32 | | --> 389 return self._get_object()(*args, **kwds) |

33 | | 390 |

34 | | 391 def __repr__(self): |

35 | | |

36 | | /Users/jplab/sage/sage2/local/lib/python2.7/site-packages/sage/geometry/polyhedron/constructor.pyc in Polyhedron(vertices, rays, lines, ieqs, eqns, ambient_dim, base_ring, minimize, verbose, backend) |

37 | | 490 # Specific backends can override the base_ring |

38 | | 491 from sage.geometry.polyhedron.parent import Polyhedra |

39 | | --> 492 parent = Polyhedra(base_ring, ambient_dim, backend=backend) |

40 | | 493 base_ring = parent.base_ring() |

41 | | 494 |

42 | | |

43 | | /Users/jplab/sage/sage2/local/lib/python2.7/site-packages/sage/geometry/polyhedron/parent.pyc in Polyhedra(base_ring, ambient_dim, backend) |

44 | | 89 elif base_ring is RDF: |

45 | | 90 backend = 'cdd' |

46 | | ---> 91 elif base_ring.is_exact(): |

47 | | 92 backend = 'field' |

48 | | 93 else: |

49 | | |

| 24 | Traceback (most recent call last): |

| 25 | ... |