#11412: bug in the creation of partitions starting from a core and a tuple of
quotients
-----------------------------+----------------------------------------------
Reporter: pdehaye | Owner: sage-combinat
Type: defect | Status: new
Priority: critical | Milestone: sage-4.7.1
Component: combinatorics | Keywords: partition core quotient
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
-----------------------------+----------------------------------------------
the Partition(core=????,quotient=???) construction is broken in some very
specific cases, even after applying #11165. For instance, after patching
with #11165:
{{{
sage: Partition(core=[2,1],quotient=([],[1,1,1,1,1,1,1]))
[4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1]
sage: Partition(core=[3,2,1],quotient=([],[1,1,1,1,1,1,1]))
ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (3247, 0))
---------------------------------------------------------------------------
IndexError Traceback (most recent call
last)
/Volumes/Scratch/Users/duser1/sage/<ipython console> in <module>()
/Users/duser1/sage/local/lib/python2.6/site-
packages/sage/combinat/partition.pyc in Partition(mu, **keyword)
262 return from_exp(keyword['exp'])
263 elif 'core' in keyword and 'quotient' in keyword and
len(keyword)==2:
--> 264 return from_core_and_quotient(keyword['core'],
keyword['quotient'])
265 elif 'core' in keyword and 'canonical_quotient' in keyword and
len(keyword)==2:
266 raise NotImplementedError
/Users/duser1/sage/local/lib/python2.6/site-
packages/sage/combinat/partition.pyc in from_core_and_quotient(core,
quotient)
314 new_w = []
315 for i in range(length):
--> 316 new_w += [ w[i][j] + length*quotient[i][j] for j in
range(len(quotient[i]))]
317 new_w += [ w[i][j] for j in range(len(quotient[i]),
len(w[i])) ]
318 new_w.sort()
IndexError: list index out of range
}}}
works in the first case, fails in the second. the code is also badly
documented. patch coming shortly.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11412>
Sage <http://www.sagemath.org>
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