#18208: `AlternatingSignMatrices(3, use_monotone_triangles=False)` broken
-------------------------+-------------------------------------------------
Reporter: darij | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.7
Component: | Keywords: alternating sign matrix,
combinatorics | contretableaux, tableaux
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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I have added a comment in the sourcecode in #18075, but someone actually
should fix this:
(path: root/src/sage/combinat/alternating_sign_matrix.py)
{{{
def __iter__(self):
r"""
Iterator on the alternating sign matrices of size `n`.
If defined using ``use_monotone_triangles``, this iterator
will use the iteration on the monotone triangles. Else, it
will use the iteration on contre-tableaux.
TESTS::
sage: A = AlternatingSignMatrices(4)
sage: len(list(A))
42
"""
if self._umt:
for t in MonotoneTriangles(self._n):
yield self.from_monotone_triangle(t)
else:
for c in ContreTableaux(self._n):
yield from_contre_tableau(c)
# This is broken!
# sage: A = AlternatingSignMatrices(3,
use_monotone_triangles=False)
# sage: list(A)
#
---------------------------------------------------------------------------
# NameError Traceback
(most recent call last)
# ...
# NameError: global name 'from_contre_tableau' is not
defined
# If this is really obsolete, the else-branch should be
# removed and the doc modified accordingly.
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/18208>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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