Opened 12 years ago

Closed 12 years ago

Last modified 6 years ago

#4764 closed defect (duplicate)

Error in computing complement of modular symbol space

Reported by: robertwb Owned by: craigcitro
Priority: major Milestone: sage-3.2.2
Component: modular forms Keywords:
Cc: Merged in:
Authors: Reviewers:
Report Upstream: N/A Work issues:
Branch: Commit:
Dependencies: Stopgaps:

Status badges

Description (last modified by chapoton)

sage: f = EllipticCurve('128a').modular_symbol_space()
sage: f.complement()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/robert/.sage/sage_notebook/worksheets/admin/110/code/7.py", line 7, in <module>
    f.complement()
  File "/Users/robert/sage/current/local/lib/python2.5/site-packages/SQLAlchemy-0.4.6-py2.5.egg/", line 1, in <module>
    
  File "/Users/robert/sage/sage-3.1.3/local/lib/python2.5/site-packages/sage/modular/hecke/submodule.py", line 202, in complement
    raise RuntimeError, "Computation of complementary space failed (cut down to rank %s, but should have cut down to rank %s)."%(V.rank(), self.rank())
RuntimeError: Computation of complementary space failed (cut down to rank 18, but should have cut down to rank 1).

Note that the error is wrong, as

sage: ModularSymbols(128, sign=1)

Modular Symbols space of dimension 18 for Gamma_0(128) of weight 2 with sign 1 over Rational Field

however, it should have cut the rank down to 17.

Change History (4)

comment:1 Changed 12 years ago by AlexGhitza

  • Summary changed from Error in computing compliment of modular symbol space to Error in computing complement of modular symbol space

comment:2 Changed 12 years ago by craigcitro

This seems to be the same error as #1127 ...

I'm curious whether my (still unfinished) patch from #2535 might help. I don't know that I ever checked ...

comment:3 Changed 12 years ago by robertwb

  • Resolution set to duplicate
  • Status changed from new to closed

You're right, it is exactly #1127. I searched before making a ticket, but I guess I didn't go far enough back in time. Hopefully you've already fixed it :).

I'm closing this as a dupe.

comment:4 Changed 6 years ago by chapoton

  • Description modified (diff)
  • Report Upstream set to N/A
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