#20890: plethysm of certain symmetric functions raises an error
----------------------------+-----------------------------
Reporter: zabrocki | Type: defect
Status: new | Priority: major
Milestone: sage-7.3 | Component: combinatorics
Keywords: sf | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
----------------------------+-----------------------------
I haven't quite tracked down the source of this bug but here is an
example:
{{{
sage: (p[[]]-1/2*p[1,1]).plethysm(p[1]) # ok
p[] - 1/2*p[1, 1]
sage: (p[[]]-1/2*p[2]).plethysm(p[1]) # not ok
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "_sage_input_242.py", line 10, in <module>
exec compile(u'open("___code___.py","w").write("# -*- coding: utf-8
-*-\\n" +
_support_.preparse_worksheet_cell(base64.b64decode("cChwW1tdXSAtIDEvMipwWzJdKS5wbGV0aHlzbShwWzFdKQ=="),globals())+"\\n");
execfile(os.path.abspath("___code___.py"))
File "", line 1, in <module>
File
"/private/var/folders/_3/qq_ptsxd0bd645cgmgt_ssrm0000gn/T/tmpBe6ZN3/___code___.py",
line 3, in <module>
exec compile(u'p(p[[]] - _sage_const_1 /_sage_const_2 *p[_sage_const_2
]).plethysm(p[_sage_const_1 ])
File "", line 1, in <module>
File "/Applications/sage/local/lib/python2.7/site-
packages/sage/combinat/sf/sfa.py", line 2861, in plethysm
return parent(p._apply_module_morphism(p(self),f))
File "/Applications/sage/local/lib/python2.7/site-
packages/sage/categories/modules_with_basis.py", line 1078, in
_apply_module_morphism
for key, coeff in mc.iteritems() )
File "/Applications/sage/local/lib/python2.7/site-
packages/sage/combinat/free_module.py", line 1579, in linear_combination
return self._from_dict( dict_linear_combination( ( (
element._monomial_coefficients, coeff ) for element, coeff in
iter_of_elements_coeff ), factor_on_left=factor_on_left ),
remove_zeros=False )
File "sage/combinat/dict_addition.pyx", line 61, in
sage.combinat.dict_addition.dict_linear_combination
(/Applications/sage/src/build/cythonized/sage/combinat/dict_addition.c:2381)
File "sage/combinat/dict_addition.pyx", line 88, in
sage.combinat.dict_addition.dict_linear_combination
(/Applications/sage/src/build/cythonized/sage/combinat/dict_addition.c:1398)
File "/Applications/sage/local/lib/python2.7/site-
packages/sage/combinat/free_module.py", line 1579, in <genexpr>
return self._from_dict( dict_linear_combination( ( (
element._monomial_coefficients, coeff ) for element, coeff in
iter_of_elements_coeff ), factor_on_left=factor_on_left ),
remove_zeros=False )
File "sage/structure/element.pyx", line 413, in
sage.structure.element.Element.__getattr__
(/Applications/sage/src/build/cythonized/sage/structure/element.c:4649)
File "sage/structure/misc.pyx", line 259, in
sage.structure.misc.getattr_from_other_class
(/Applications/sage/src/build/cythonized/sage/structure/misc.c:1870)
AttributeError: 'sage.rings.integer.Integer' object has no attribute
'_monomial_coefficients'
}}}
--
Ticket URL: <https://trac.sagemath.org/ticket/20890>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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