#17583: Clean up free module elements
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Reporter: jdemeyer | Owner:
Type: enhancement | Status: needs_info
Priority: major | Milestone: sage-6.5
Component: linear algebra | Resolution:
Keywords: | Merged in:
Authors: Jeroen Demeyer | Reviewers: Marc Mezzarobba
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jdemeyer/ticket/17583 | 66d2f76d685f654f18b77f0051ae85235a4f846f
Dependencies: #17561 | Stopgaps:
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Comment (by jdemeyer):
Replying to [comment:5 mmezzarobba]:
> By the way, is there a reason to special-case the vectors of length zero
in `FreeModuleElement.dot_product()`?
Yes, to apply the following optimization: instead of starting with zero
and `a[i]*b[i]`, we start with `a[0] * b[0]` and add `a[i]*b[i]` for `i >=
1`.
I'm actually preparing a commit which refactors dot products, since the
logic was a bit strange. With the new commit (still testing), there will
be a `cpdef` method `_dot_product_` for equal parents and
`_dot_product_coerce_` for parents which might be different.
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Ticket URL: <http://trac.sagemath.org/ticket/17583#comment:6>
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