Works for me. I guess the sagenb.org version isn't quite up to speed....
sage: Polyhedron([[0.8,-0.5],[0.3,0.3]])
A 1-dimensional polyhedron in RDF^2 defined as the convex hull of 2 vertices
On Wednesday, April 10, 2013 5:29:39 PM UTC+1, Victor Miller wrote:
>
> 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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