#13165: Error multiplying modular forms of level Gamma1
---------------------------------+------------------------------------------
Reporter: davidloeffler | Owner: craigcitro
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.11
Component: modular forms | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers: Peter Bruin
Authors: Armin Straub | Merged in:
Dependencies: | Stopgaps:
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Changes (by pbruin):
* status: needs_info => needs_review
Old description:
> The following was reported by Nadim Restom on sage-support
> [https://groups.google.com/forum/?fromgroups#!topic/sage-
> support/c-wjnYxAcn8 here]:
> {{{
> f = ModularForms(Gamma1(5),2).0
> f*f
>
> I am getting an error:
>
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "_sage_input_5.py", line 10, in <module>
> exec compile(u'open("___code___.py","w").write("# -*- coding: utf-8
> -*-\\n" +
> _support_.preparse_worksheet_cell(base64.b64decode("Zipm"),globals())+"\\n");
> execfile(os.path.abspath("___code___.py"))
> File "", line 1, in <module>
>
> File "/tmp/tmp9a_pAs/___code___.py", line 2, in <module>
> exec compile(u'f*f
> File "", line 1, in <module>
>
> File
> "/sagenb/sage_install/sage-5.0-boxen-x86_64-Linux/local/lib/python2.7
> /site-packages/sage/modular/modform/element.py", line 1034, in __mul__
> eps1 = self.character()
> File
> "/sagenb/sage_install/sage-5.0-boxen-x86_64-Linux/local/lib/python2.7
> /site-packages/sage/modular/modform/element.py", line 423, in character
> raise ValueError, "Form is not an eigenvector for <%s>" % g
> ValueError: Form is not an eigenvector for <2>
> }}}
>
> Looks like line 1040 of sage/modular/modform/element.py is the culprit.
New description:
The following was reported by Nadim Restom on sage-support
[https://groups.google.com/forum/?fromgroups#!topic/sage-
support/c-wjnYxAcn8 here]:
{{{
f = ModularForms(Gamma1(5),2).0
f*f
I am getting an error:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "_sage_input_5.py", line 10, in <module>
exec compile(u'open("___code___.py","w").write("# -*- coding: utf-8
-*-\\n" +
_support_.preparse_worksheet_cell(base64.b64decode("Zipm"),globals())+"\\n");
execfile(os.path.abspath("___code___.py"))
File "", line 1, in <module>
File "/tmp/tmp9a_pAs/___code___.py", line 2, in <module>
exec compile(u'f*f
File "", line 1, in <module>
File
"/sagenb/sage_install/sage-5.0-boxen-x86_64-Linux/local/lib/python2.7
/site-packages/sage/modular/modform/element.py", line 1034, in __mul__
eps1 = self.character()
File
"/sagenb/sage_install/sage-5.0-boxen-x86_64-Linux/local/lib/python2.7
/site-packages/sage/modular/modform/element.py", line 423, in character
raise ValueError, "Form is not an eigenvector for <%s>" % g
ValueError: Form is not an eigenvector for <2>
}}}
Looks like line 1040 of sage/modular/modform/element.py is the culprit.
Apply: :attachment:trac_13165_modform_multiply_2.patch
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13165#comment:10>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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