#18663: Speed up computation of twists of newforms
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Reporter: davidloeffler | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.8
Component: modular forms | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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The current code for computing twists of newforms by Dirichlet characters
is unnecessarily slow, because it computes a full decomposition of the
target space into simple Hecke modules, and then throws all but one of the
factors away. It is quicker just to directly pull out the appropriate
factor using kernels of Hecke matrices.
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Ticket URL: <http://trac.sagemath.org/ticket/18663>
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