#5465: [with patch, positive review] render3d for groebner fans is totally
broken
----------------------------+--------------------------
Reporter: was | Owner: mhampton
Type: defect | Status: closed
Priority: major | Milestone: sage-3.4.1
Component: geometry | Resolution: fixed
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
----------------------------+--------------------------
Changes (by chapoton):
* upstream: => N/A
Old description:
> {{{
> teragon:~ wstein$ sage
> ----------------------------------------------------------------------
> | Sage Version 3.4.alpha0, Release Date: 2009-02-24 |
> | Type notebook() for the GUI, and license() for information. |
> ----------------------------------------------------------------------
> sage: P.<a,b,c> = PolynomialRing(QQ,3, order='lex')
> sage: sage.rings.ideal.Katsura(P,3).groebner_fan().render3d()
> ---------------------------------------------------------------------------
> UnboundLocalError Traceback (most recent call
> last)
>
> /Users/wstein/.sage/temp/teragon.local/68617/_Users_wstein__sage_init_sage_0.py
> in <module>()
>
> /Users/wstein/build/sage-3.4.alpha0/local/lib/python2.5/site-
> packages/sage/rings/polynomial/groebner_fan.pyc in render3d(self,
> verbose)
> 1067 g_cones_ieqs = [self._cone_to_ieq(q) for q in
> g_cones_facets]
> 1068 # Now the cones are intersected with a plane:
> -> 1069 cone_info = [ieq_to_vert(q,linearities=[[1,-1,-1,-1,-1]])
> for q in g_cones_ieqs]
> 1070 if verbose:
> 1071 for x in cone_info:
>
> /Users/wstein/build/sage-3.4.alpha0/local/lib/python2.5/site-
> packages/sage/geometry/polyhedra.pyc in ieq_to_vert(in_list, linearities,
> cdd_type, verbose)
> 1268 adj_index = index
> 1269 # read the vertices and rays:
> -> 1270 for index in range(vert_index,len(ans_lines)):
> 1271 a_line = ans_lines[index]
> 1272 if a_line.find('end') != -1: break
>
> UnboundLocalError: local variable 'vert_index' referenced before
> assignment
> }}}
New description:
{{{
teragon:~ wstein$ sage
----------------------------------------------------------------------
| Sage Version 3.4.alpha0, Release Date: 2009-02-24 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: P.<a,b,c> = PolynomialRing(QQ,3, order='lex')
sage: sage.rings.ideal.Katsura(P,3).groebner_fan().render3d()
---------------------------------------------------------------------------
UnboundLocalError Traceback (most recent call
last)
/Users/wstein/.sage/temp/teragon.local/68617/_Users_wstein__sage_init_sage_0.py
in <module>()
/Users/wstein/build/sage-3.4.alpha0/local/lib/python2.5/site-
packages/sage/rings/polynomial/groebner_fan.pyc in render3d(self, verbose)
1067 g_cones_ieqs = [self._cone_to_ieq(q) for q in
g_cones_facets]
1068 # Now the cones are intersected with a plane:
-> 1069 cone_info = [ieq_to_vert(q,linearities=[[1,-1,-1,-1,-1]])
for q in g_cones_ieqs]
1070 if verbose:
1071 for x in cone_info:
/Users/wstein/build/sage-3.4.alpha0/local/lib/python2.5/site-
packages/sage/geometry/polyhedra.pyc in ieq_to_vert(in_list, linearities,
cdd_type, verbose)
1268 adj_index = index
1269 # read the vertices and rays:
-> 1270 for index in range(vert_index,len(ans_lines)):
1271 a_line = ans_lines[index]
1272 if a_line.find('end') != -1: break
UnboundLocalError: local variable 'vert_index' referenced before
assignment
}}}
--
--
Ticket URL: <http://trac.sagemath.org/ticket/5465#comment:8>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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