#18663: Speed up computation of twists of newforms
-------------------------------------+-------------------------------------
Reporter: davidloeffler | Owner:
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.8
Component: modular forms | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/davidloeffler/better_twists | 480f9516ba7526b13ae34bd8b31dc224f1c62432
Dependencies: #18478 | Stopgaps:
-------------------------------------+-------------------------------------
Changes (by pbruin):
* status: needs_review => needs_work
* dependencies: 18478 => #18478
Comment:
I haven't looked at this in detail, but with both this ticket and #6018
applied, the example from comment:15:ticket:18086 only takes about a
second. However, some long doctests fail even with #18478 merged:
{{{
sage -t --long --warn-long 49.1 src/sage/modular/modform/element.py
**********************************************************************
File "src/sage/modular/modform/element.py", line 1188, in
sage.modular.modform.element.Newform.twist
Failed example:
Delta.twist(chi, level=3) # long time
Expected:
Traceback (most recent call last):
...
RuntimeError: twist of q - 24*q^2 + 252*q^3 - 1472*q^4 + 4830*q^5 +
O(q^6) by Dirichlet character modulo 1 of conductor 1 is not a newform in
Cuspidal subspace of dimension 3 of Modular Forms space of dimension 5 for
Congruence Subgroup Gamma0(3) of weight 12 over Cyclotomic Field of order
1 and degree 1
Got:
...
raise RuntimeError('twist of %s by %s is not a newform in %s' %
(self, chi, S))
UnboundLocalError: local variable 'S' referenced before assignment
**********************************************************************
File "src/sage/modular/modform/element.py", line 1192, in
sage.modular.modform.element.Newform.twist
Failed example:
Delta.twist(chi, level=3, check=False) # long time
Exception raised:
...
raise RuntimeError('twist of %s by %s is not a newform in %s' %
(self, chi, S))
UnboundLocalError: local variable 'S' referenced before assignment
**********************************************************************
1 item had failures:
2 of 17 in sage.modular.modform.element.Newform.twist
[305 tests, 2 failures, 45.85 s]
----------------------------------------------------------------------
sage -t --long --warn-long 49.1 src/sage/modular/modform/element.py # 2
doctests failed
----------------------------------------------------------------------
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/18663#comment:4>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac.
For more options, visit https://groups.google.com/d/optout.
