I've found that if l is a list of points with float coordinates, then
Polyhedron(vertices=l)
gives a long trace back error message (see below for example). At the very
least it should give something short like asking the user to specify a
base_ring argument. Even better, would be to infer a base_ring from the
list of vertices. T he traceback below is from a sagenb.org notebook.
Victor
l = [[0.8,-0.5],[0.3,0.3]]
P0 = Polyhedron(vertices=l)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "_sage_input_15.py", line 10, in <module>
exec compile(u'open("___code___.py","w").write("# -*- coding: utf-8 -*-\\n"
+
_support_.preparse_worksheet_cell(base64.b64decode("UDAgPSBQb2x5aGVkcm9uKHZlcnRpY2VzPWwp"),globals())+"\\n");
execfile(os.path.abspath("___code___.py"))
File "", line 1, in <module>
File "/tmp/tmpcYyKji/___code___.py", line 2, in <module>
exec compile(u'P0 = Polyhedron(vertices=l)
File "", line 1, in <module>
File
"/sagenb/sage_install/sage-5.4-sage.math.washington.edu-x86_64-Linux/local/lib/python2.7/site-packages/sage/misc/decorators.py",
line 691, in wrapper
return func(*args, **kwds)
File
"/sagenb/sage_install/sage-5.4-sage.math.washington.edu-x86_64-Linux/local/lib/python2.7/site-packages/sage/geometry/polyhedron/constructor.py",
line 287, in Polyhedron
return Polyhedron_QQ_ppl(ambient_dim, Vrep, Hrep, minimize=minimize)
File
"/sagenb/sage_install/sage-5.4-sage.math.washington.edu-x86_64-Linux/local/lib/python2.7/site-packages/sage/geometry/polyhedron/base.py",
line 126, in __init__
self._init_from_Vrepresentation(ambient_dim, vertices, rays, lines, **kwds)
File
"/sagenb/sage_install/sage-5.4-sage.math.washington.edu-x86_64-Linux/local/lib/python2.7/site-packages/sage/geometry/polyhedron/backend_ppl.py",
line 72, in _init_from_Vrepresentation
d = lcm([denominator(v_i) for v_i in v])
File
"/sagenb/sage_install/sage-5.4-sage.math.washington.edu-x86_64-Linux/local/lib/python2.7/site-packages/sage/misc/functional.py",
line 324, in denominator
return x.denominator()
File "element.pyx", line 332, in sage.structure.element.Element.__getattr__
(sage/structure/element.c:3475)
File "misc.pyx", line 204, in sage.structure.misc.getattr_from_other_class
(sage/structure/misc.c:1509)
AttributeError: 'sage.rings.real_mpfr.RealLiteral' object has no attribute
'denominator'
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